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authorJohn Crispin <john@openwrt.org>2015-07-17 12:48:39 +0000
committerJohn Crispin <john@openwrt.org>2015-07-17 12:48:39 +0000
commit208ab54e3e9516dd9fcf1ce197950044e0bebd90 (patch)
tree425580d694235f06661dd2d6763925a1f69279c6 /target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch
parent03b56c9350057ee77cfe2b8bb8f8d7146917fb79 (diff)
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brcm2708: add linux 4.1 support
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 46399
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch1088
1 files changed, 1088 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch b/target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch
new file mode 100644
index 0000000..f80e52e
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0076-bcm2835-sdhost-Improve-error-handling-and-recovery.patch
@@ -0,0 +1,1088 @@
+From 175d8f77d2fe5ed0d43d53ece08978fd50c97a97 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 17 Jun 2015 11:36:53 +0100
+Subject: [PATCH 076/121] bcm2835-sdhost: Improve error handling and recovery
+
+1) Expose the hw_reset method to the MMC framework, removing many
+ internal calls by the driver.
+
+2) Reduce overclock setting on error.
+
+3) Increase timeout to cope with high capacity cards.
+
+4) Add properties and parameters to control pio_limit and debug.
+
+5) Reduce messages at probe time.
+---
+ arch/arm/boot/dts/overlays/README | 8 +-
+ arch/arm/boot/dts/overlays/sdhost-overlay.dts | 4 +-
+ drivers/mmc/host/bcm2835-sdhost.c | 578 ++++++++++++++++++--------
+ 3 files changed, 404 insertions(+), 186 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -408,7 +408,13 @@ Info: Selects the bcm2835-sdhost SD/MM
+ Load: dtoverlay=sdhost,<param>=<val>
+ Params: overclock_50 Clock (in MHz) to use when the MMC framework
+ requests 50MHz
+- force_pio Disable DMA support
++
++ force_pio Disable DMA support (default off)
++
++ pio_limit Number of blocks above which to use DMA
++ (default 2)
++
++ debug Enable debug output (default off)
+
+
+ Name: spi-bcm2708
+--- a/arch/arm/boot/dts/overlays/sdhost-overlay.dts
++++ b/arch/arm/boot/dts/overlays/sdhost-overlay.dts
+@@ -22,6 +22,7 @@
+ dma-names = "tx", "rx";
+ brcm,delay-after-stop = <0>;
+ brcm,overclock-50 = <0>;
++ brcm,pio-limit = <2>;
+ status = "okay";
+ };
+ };
+@@ -70,9 +71,10 @@
+ };
+
+ __overrides__ {
+- delay_after_stop = <&sdhost>,"brcm,delay-after-stop:0";
+ overclock_50 = <&sdhost>,"brcm,overclock-50:0";
+ force_pio = <&sdhost>,"brcm,force-pio?";
++ pio_limit = <&sdhost>,"brcm,pio-limit:0";
++ debug = <&sdhost>,"brcm,debug?";
+ sdhost_freq = <&clk_sdhost>,"clock-frequency:0";
+ };
+ };
+--- a/drivers/mmc/host/bcm2835-sdhost.c
++++ b/drivers/mmc/host/bcm2835-sdhost.c
+@@ -90,9 +90,8 @@
+ /* Reserved */
+ #define SDHSTS_DATA_FLAG 0x01
+
+-#define SDHSTS_TRANSFER_ERROR_MASK (SDHSTS_CRC16_ERROR|SDHSTS_REW_TIME_OUT|SDHSTS_FIFO_ERROR)
++#define SDHSTS_TRANSFER_ERROR_MASK (SDHSTS_CRC7_ERROR|SDHSTS_CRC16_ERROR|SDHSTS_REW_TIME_OUT|SDHSTS_FIFO_ERROR)
+ #define SDHSTS_ERROR_MASK (SDHSTS_CMD_TIME_OUT|SDHSTS_TRANSFER_ERROR_MASK)
+-/* SDHSTS_CRC7_ERROR - ignore this as MMC cards generate this spuriously */
+
+ #define SDHCFG_BUSY_IRPT_EN (1<<10)
+ #define SDHCFG_BLOCK_IRPT_EN (1<<8)
+@@ -111,16 +110,7 @@
+ #define SDEDM_READ_THRESHOLD_SHIFT 14
+ #define SDEDM_THRESHOLD_MASK 0x1f
+
+-/* the inclusive limit in bytes under which PIO will be used instead of DMA */
+-#ifdef CONFIG_MMC_BCM2835_SDHOST_PIO_DMA_BARRIER
+-#define PIO_DMA_BARRIER CONFIG_MMC_BCM2835_SDHOST_PIO_DMA_BARRIER
+-#else
+-#define PIO_DMA_BARRIER 0
+-#endif
+-
+-#define MIN_FREQ 400000
+-#define TIMEOUT_VAL 0xE
+-#define BCM2835_SDHOST_WRITE_DELAY(f) (((2 * 1000000) / f) + 1)
++#define MHZ 1000000
+
+ #ifndef BCM2708_PERI_BASE
+ #define BCM2708_PERI_BASE 0x20000000
+@@ -138,19 +128,20 @@ struct bcm2835_host {
+
+ struct mmc_host *mmc;
+
+- u32 timeout;
++ u32 pio_timeout; /* In jiffies */
+
+ int clock; /* Current clock speed */
+
+ bool slow_card; /* Force 11-bit divisor */
+
+ unsigned int max_clk; /* Max possible freq */
+- unsigned int timeout_clk; /* Timeout freq (KHz) */
+
+ struct tasklet_struct finish_tasklet; /* Tasklet structures */
+
+ struct timer_list timer; /* Timer for timeouts */
+
++ struct timer_list pio_timer; /* PIO error detection timer */
++
+ struct sg_mapping_iter sg_miter; /* SG state for PIO */
+ unsigned int blocks; /* remaining PIO blocks */
+
+@@ -170,6 +161,10 @@ struct bcm2835_host {
+
+ unsigned int use_busy:1; /* Wait for busy interrupt */
+
++ unsigned int reduce_overclock:1; /* ...at the next opportunity */
++
++ unsigned int debug:1; /* Enable debug output */
++
+ u32 thread_isr;
+
+ /*DMA part*/
+@@ -185,7 +180,8 @@ struct bcm2835_host {
+ struct timeval stop_time; /* when the last stop was issued */
+ u32 delay_after_stop; /* minimum time between stop and subsequent data transfer */
+ u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */
+- u32 max_overclock; /* Highest reported */
++ u32 overclock; /* Current frequency if overclocked, else zero */
++ u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
+ };
+
+
+@@ -204,41 +200,79 @@ static inline u32 bcm2835_sdhost_read_re
+ return readl_relaxed(host->ioaddr + reg);
+ }
+
++static void bcm2835_sdhost_dumpcmd(struct bcm2835_host *host,
++ struct mmc_command *cmd,
++ const char *label)
++{
++ if (cmd)
++ pr_info("%s:%c%s op %d arg 0x%x flags 0x%x - resp %08x %08x %08x %08x, err %d\n",
++ mmc_hostname(host->mmc),
++ (cmd == host->cmd) ? '>' : ' ',
++ label, cmd->opcode, cmd->arg, cmd->flags,
++ cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3],
++ cmd->error);
++}
++
+ static void bcm2835_sdhost_dumpregs(struct bcm2835_host *host)
+ {
+- pr_info(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
++ bcm2835_sdhost_dumpcmd(host, host->mrq->sbc, "sbc");
++ bcm2835_sdhost_dumpcmd(host, host->mrq->cmd, "cmd");
++ if (host->mrq->data)
++ pr_err("%s: data blocks %x blksz %x - err %d\n",
++ mmc_hostname(host->mmc),
++ host->mrq->data->blocks,
++ host->mrq->data->blksz,
++ host->mrq->data->error);
++ bcm2835_sdhost_dumpcmd(host, host->mrq->stop, "stop");
++
++ pr_info("%s: =========== REGISTER DUMP ===========\n",
+ mmc_hostname(host->mmc));
+
+- pr_info(DRIVER_NAME ": SDCMD 0x%08x\n",
++ pr_info("%s: SDCMD 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDCMD));
+- pr_info(DRIVER_NAME ": SDARG 0x%08x\n",
++ pr_info("%s: SDARG 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDARG));
+- pr_info(DRIVER_NAME ": SDTOUT 0x%08x\n",
++ pr_info("%s: SDTOUT 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDTOUT));
+- pr_info(DRIVER_NAME ": SDCDIV 0x%08x\n",
++ pr_info("%s: SDCDIV 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDCDIV));
+- pr_info(DRIVER_NAME ": SDRSP0 0x%08x\n",
++ pr_info("%s: SDRSP0 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDRSP0));
+- pr_info(DRIVER_NAME ": SDRSP1 0x%08x\n",
++ pr_info("%s: SDRSP1 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDRSP1));
+- pr_info(DRIVER_NAME ": SDRSP2 0x%08x\n",
++ pr_info("%s: SDRSP2 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDRSP2));
+- pr_info(DRIVER_NAME ": SDRSP3 0x%08x\n",
++ pr_info("%s: SDRSP3 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDRSP3));
+- pr_info(DRIVER_NAME ": SDHSTS 0x%08x\n",
++ pr_info("%s: SDHSTS 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDHSTS));
+- pr_info(DRIVER_NAME ": SDVDD 0x%08x\n",
++ pr_info("%s: SDVDD 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDVDD));
+- pr_info(DRIVER_NAME ": SDEDM 0x%08x\n",
++ pr_info("%s: SDEDM 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDEDM));
+- pr_info(DRIVER_NAME ": SDHCFG 0x%08x\n",
++ pr_info("%s: SDHCFG 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDHCFG));
+- pr_info(DRIVER_NAME ": SDHBCT 0x%08x\n",
++ pr_info("%s: SDHBCT 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDHBCT));
+- pr_info(DRIVER_NAME ": SDHBLC 0x%08x\n",
++ pr_info("%s: SDHBLC 0x%08x\n",
++ mmc_hostname(host->mmc),
+ bcm2835_sdhost_read(host, SDHBLC));
+
+- pr_debug(DRIVER_NAME ": ===========================================\n");
++ pr_info("%s: ===========================================\n",
++ mmc_hostname(host->mmc));
+ }
+
+
+@@ -248,12 +282,10 @@ static void bcm2835_sdhost_set_power(str
+ }
+
+
+-static void bcm2835_sdhost_reset(struct bcm2835_host *host)
++static void bcm2835_sdhost_reset_internal(struct bcm2835_host *host)
+ {
+ u32 temp;
+
+- pr_debug("bcm2835_sdhost_reset\n");
+-
+ bcm2835_sdhost_set_power(host, false);
+
+ bcm2835_sdhost_write(host, 0, SDCMD);
+@@ -281,6 +313,20 @@ static void bcm2835_sdhost_reset(struct
+ mmiowb();
+ }
+
++
++static void bcm2835_sdhost_reset(struct mmc_host *mmc)
++{
++ struct bcm2835_host *host = mmc_priv(mmc);
++ unsigned long flags;
++ if (host->debug)
++ pr_info("%s: reset\n", mmc_hostname(mmc));
++ spin_lock_irqsave(&host->lock, flags);
++
++ bcm2835_sdhost_reset_internal(host);
++
++ spin_unlock_irqrestore(&host->lock, flags);
++}
++
+ static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
+
+ static void bcm2835_sdhost_init(struct bcm2835_host *host, int soft)
+@@ -290,7 +336,7 @@ static void bcm2835_sdhost_init(struct b
+ /* Set interrupt enables */
+ host->hcfg = SDHCFG_BUSY_IRPT_EN;
+
+- bcm2835_sdhost_reset(host);
++ bcm2835_sdhost_reset_internal(host);
+
+ if (soft) {
+ /* force clock reconfiguration */
+@@ -420,6 +466,40 @@ static void bcm2835_sdhost_dma_complete(
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+
++static bool data_transfer_wait(struct bcm2835_host *host, const char *caller)
++{
++ unsigned long timeout = 1000000;
++ u32 hsts;
++ while (timeout)
++ {
++ hsts = bcm2835_sdhost_read(host, SDHSTS);
++ if (hsts & (SDHSTS_TRANSFER_ERROR_MASK |
++ SDHSTS_DATA_FLAG)) {
++ bcm2835_sdhost_write(host, SDHSTS_TRANSFER_ERROR_MASK,
++ SDHSTS);
++ break;
++ }
++ timeout--;
++ }
++
++ if (hsts & (SDHSTS_CRC16_ERROR |
++ SDHSTS_CRC7_ERROR |
++ SDHSTS_FIFO_ERROR)) {
++ pr_err("%s: data error in %s - HSTS %x\n",
++ mmc_hostname(host->mmc), caller, hsts);
++ host->data->error = -EILSEQ;
++ return false;
++ } else if ((timeout == 0) ||
++ (hsts & (SDHSTS_CMD_TIME_OUT |
++ SDHSTS_REW_TIME_OUT))) {
++ pr_err("%s: timeout in %s - HSTS %x\n",
++ mmc_hostname(host->mmc), caller, hsts);
++ host->data->error = -ETIMEDOUT;
++ return false;
++ }
++ return true;
++}
++
+ static void bcm2835_sdhost_read_block_pio(struct bcm2835_host *host)
+ {
+ unsigned long flags;
+@@ -443,35 +523,15 @@ static void bcm2835_sdhost_read_block_pi
+ buf = (u32 *)host->sg_miter.addr;
+
+ while (len) {
+- while (1) {
+- u32 hsts;
+- hsts = bcm2835_sdhost_read(host, SDHSTS);
+- if (hsts & SDHSTS_DATA_FLAG)
+- break;
+-
+- if (hsts & SDHSTS_ERROR_MASK) {
+- pr_err("%s: Transfer error - HSTS %x, HBCT %x - %x left\n",
+- mmc_hostname(host->mmc),
+- hsts,
+- bcm2835_sdhost_read(host, SDHBCT),
+- blksize + len);
+- if (hsts & SDHSTS_REW_TIME_OUT)
+- host->data->error = -ETIMEDOUT;
+- else if (hsts & (SDHSTS_CRC16_ERROR ||
+- SDHSTS_CRC7_ERROR))
+- host->data->error = -EILSEQ;
+- else {
+- pr_err("%s: unexpected data error\n",
+- mmc_hostname(host->mmc));
+- bcm2835_sdhost_dumpregs(host);
+- host->cmd->error = -EIO;
+- }
+- }
+- }
++ if (!data_transfer_wait(host, "read_block_pio"))
++ break;
+
+ *(buf++) = bcm2835_sdhost_read(host, SDDATA);
+ len -= 4;
+ }
++
++ if (host->data->error)
++ break;
+ }
+
+ sg_miter_stop(&host->sg_miter);
+@@ -502,11 +562,15 @@ static void bcm2835_sdhost_write_block_p
+ buf = host->sg_miter.addr;
+
+ while (len) {
+- while (!(bcm2835_sdhost_read(host, SDHSTS) & SDHSTS_DATA_FLAG))
+- continue;
++ if (!data_transfer_wait(host, "write_block_pio"))
++ break;
++
+ bcm2835_sdhost_write(host, *(buf++), SDDATA);
+ len -= 4;
+ }
++
++ if (host->data->error)
++ break;
+ }
+
+ sg_miter_stop(&host->sg_miter);
+@@ -519,10 +583,15 @@ static void bcm2835_sdhost_transfer_pio(
+ {
+ BUG_ON(!host->data);
+
+- if (host->data->flags & MMC_DATA_READ)
++ if (host->data->flags & MMC_DATA_READ) {
+ bcm2835_sdhost_read_block_pio(host);
+- else
++ } else {
+ bcm2835_sdhost_write_block_pio(host);
++
++ /* Start a timer in case a transfer error occurs because
++ there is no error interrupt */
++ mod_timer(&host->pio_timer, jiffies + host->pio_timeout);
++ }
+ }
+
+
+@@ -607,6 +676,7 @@ static void bcm2835_sdhost_prepare_data(
+ host->flush_fifo = 0;
+ host->data->bytes_xfered = 0;
+
++ host->use_dma = host->have_dma && (data->blocks > host->pio_limit);
+ if (!host->use_dma) {
+ int flags;
+
+@@ -619,8 +689,6 @@ static void bcm2835_sdhost_prepare_data(
+ host->blocks = data->blocks;
+ }
+
+- host->use_dma = host->have_dma && data->blocks > PIO_DMA_BARRIER;
+-
+ bcm2835_sdhost_set_transfer_irqs(host);
+
+ bcm2835_sdhost_write(host, data->blksz, SDHBCT);
+@@ -638,22 +706,25 @@ void bcm2835_sdhost_send_command(struct
+
+ WARN_ON(host->cmd);
+
+- if (1) {
+- pr_debug("bcm2835_sdhost_send_command: %08x %08x (flags %x)\n",
+- cmd->opcode, cmd->arg, (cmd->flags & 0xff) | (cmd->data ? cmd->data->flags : 0));
+- if (cmd->data)
+- pr_debug("bcm2835_sdhost_send_command: %s %d*%x\n",
+- (cmd->data->flags & MMC_DATA_READ) ?
+- "read" : "write", cmd->data->blocks,
+- cmd->data->blksz);
+- }
++ if (cmd->data)
++ pr_debug("%s: send_command %d 0x%x "
++ "(flags 0x%x) - %s %d*%d\n",
++ mmc_hostname(host->mmc),
++ cmd->opcode, cmd->arg, cmd->flags,
++ (cmd->data->flags & MMC_DATA_READ) ?
++ "read" : "write", cmd->data->blocks,
++ cmd->data->blksz);
++ else
++ pr_debug("%s: send_command %d 0x%x (flags 0x%x)\n",
++ mmc_hostname(host->mmc),
++ cmd->opcode, cmd->arg, cmd->flags);
+
+ /* Wait max 10 ms */
+ timeout = 1000;
+
+ while (bcm2835_sdhost_read(host, SDCMD) & SDCMD_NEW_FLAG) {
+ if (timeout == 0) {
+- pr_err("%s: Previous command never completed.\n",
++ pr_err("%s: previous command never completed.\n",
+ mmc_hostname(host->mmc));
+ bcm2835_sdhost_dumpregs(host);
+ cmd->error = -EIO;
+@@ -666,16 +737,16 @@ void bcm2835_sdhost_send_command(struct
+
+ if ((1000-timeout)/100 > 1 && (1000-timeout)/100 > host->max_delay) {
+ host->max_delay = (1000-timeout)/100;
+- pr_warning("Warning: SDHost controller hung for %d ms\n", host->max_delay);
++ pr_warning("%s: controller hung for %d ms\n",
++ mmc_hostname(host->mmc),
++ host->max_delay);
+ }
+
+ timeout = jiffies;
+-#ifdef CONFIG_ARCH_BCM2835
+ if (!cmd->data && cmd->busy_timeout > 9000)
+ timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
+ else
+-#endif
+- timeout += 10 * HZ;
++ timeout += 10 * HZ;
+ mod_timer(&host->timer, timeout);
+
+ host->cmd = cmd;
+@@ -685,7 +756,7 @@ void bcm2835_sdhost_send_command(struct
+ bcm2835_sdhost_write(host, cmd->arg, SDARG);
+
+ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
+- pr_err("%s: Unsupported response type!\n",
++ pr_err("%s: unsupported response type!\n",
+ mmc_hostname(host->mmc));
+ cmd->error = -EINVAL;
+ tasklet_schedule(&host->finish_tasklet);
+@@ -783,13 +854,6 @@ static void bcm2835_sdhost_transfer_comp
+ pr_debug("transfer_complete(error %d, stop %d)\n",
+ data->error, data->stop ? 1 : 0);
+
+- if (data->error)
+- /*
+- * The controller needs a reset of internal state machines
+- * upon error conditions.
+- */
+- bcm2835_sdhost_reset(host);
+-
+ /*
+ * Need to send CMD12 if -
+ * a) open-ended multiblock transfer (no CMD23)
+@@ -845,7 +909,7 @@ static void bcm2835_sdhost_finish_comman
+ #endif
+
+ if (timeout == 0) {
+- pr_err("%s: Command never completed.\n",
++ pr_err("%s: command never completed.\n",
+ mmc_hostname(host->mmc));
+ bcm2835_sdhost_dumpregs(host);
+ host->cmd->error = -EIO;
+@@ -875,14 +939,23 @@ static void bcm2835_sdhost_finish_comman
+ {
+ u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
+
+- pr_debug("%s: error detected - CMD %x, HSTS %03x, EDM %x\n",
+- mmc_hostname(host->mmc), sdcmd, sdhsts,
+- bcm2835_sdhost_read(host, SDEDM));
+-
+- if (sdhsts & SDHSTS_CMD_TIME_OUT)
++ if (host->debug)
++ pr_info("%s: error detected - CMD %x, HSTS %03x, EDM %x\n",
++ mmc_hostname(host->mmc), sdcmd, sdhsts,
++ bcm2835_sdhost_read(host, SDEDM));
++
++ if (sdhsts & SDHSTS_CMD_TIME_OUT) {
++ switch (host->cmd->opcode) {
++ case 5: case 52: case 53:
++ /* Don't warn about SDIO commands */
++ break;
++ default:
++ pr_err("%s: command timeout\n",
++ mmc_hostname(host->mmc));
++ break;
++ }
+ host->cmd->error = -ETIMEDOUT;
+- else
+- {
++ } else {
+ pr_err("%s: unexpected command error\n",
+ mmc_hostname(host->mmc));
+ bcm2835_sdhost_dumpregs(host);
+@@ -897,11 +970,13 @@ static void bcm2835_sdhost_finish_comman
+ int i;
+ for (i = 0; i < 4; i++)
+ host->cmd->resp[3 - i] = bcm2835_sdhost_read(host, SDRSP0 + i*4);
+- pr_debug("bcm2835_sdhost_finish_command: %08x %08x %08x %08x\n",
++ pr_debug("%s: finish_command %08x %08x %08x %08x\n",
++ mmc_hostname(host->mmc),
+ host->cmd->resp[0], host->cmd->resp[1], host->cmd->resp[2], host->cmd->resp[3]);
+ } else {
+ host->cmd->resp[0] = bcm2835_sdhost_read(host, SDRSP0);
+- pr_debug("bcm2835_sdhost_finish_command: %08x\n",
++ pr_debug("%s: finish_command %08x\n",
++ mmc_hostname(host->mmc),
+ host->cmd->resp[0]);
+ }
+ }
+@@ -932,7 +1007,7 @@ static void bcm2835_sdhost_finish_comman
+ }
+ }
+
+-static void bcm2835_sdhost_timeout_timer(unsigned long data)
++static void bcm2835_sdhost_timeout(unsigned long data)
+ {
+ struct bcm2835_host *host;
+ unsigned long flags;
+@@ -942,7 +1017,7 @@ static void bcm2835_sdhost_timeout_timer
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (host->mrq) {
+- pr_err("%s: Timeout waiting for hardware interrupt.\n",
++ pr_err("%s: timeout waiting for hardware interrupt.\n",
+ mmc_hostname(host->mmc));
+ bcm2835_sdhost_dumpregs(host);
+
+@@ -964,6 +1039,41 @@ static void bcm2835_sdhost_timeout_timer
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+
++static void bcm2835_sdhost_pio_timeout(unsigned long data)
++{
++ struct bcm2835_host *host;
++ unsigned long flags;
++
++ host = (struct bcm2835_host *)data;
++
++ spin_lock_irqsave(&host->lock, flags);
++
++ if (host->data) {
++ u32 hsts = bcm2835_sdhost_read(host, SDHSTS);
++
++ if (hsts & SDHSTS_REW_TIME_OUT) {
++ pr_err("%s: transfer timeout\n",
++ mmc_hostname(host->mmc));
++ if (host->debug)
++ bcm2835_sdhost_dumpregs(host);
++ } else {
++ pr_err("%s: unexpected transfer timeout\n",
++ mmc_hostname(host->mmc));
++ bcm2835_sdhost_dumpregs(host);
++ }
++
++ bcm2835_sdhost_write(host, SDHSTS_TRANSFER_ERROR_MASK,
++ SDHSTS);
++
++ host->data->error = -ETIMEDOUT;
++
++ bcm2835_sdhost_finish_data(host);
++ }
++
++ mmiowb();
++ spin_unlock_irqrestore(&host->lock, flags);
++}
++
+ static void bcm2835_sdhost_enable_sdio_irq_nolock(struct bcm2835_host *host, int enable)
+ {
+ if (enable)
+@@ -979,7 +1089,7 @@ static void bcm2835_sdhost_enable_sdio_i
+ struct bcm2835_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+- pr_debug("bcm2835_sdhost_enable_sdio_irq(%d)\n", enable);
++ pr_debug("%s: enable_sdio_irq(%d)\n", mmc_hostname(mmc), enable);
+ spin_lock_irqsave(&host->lock, flags);
+ bcm2835_sdhost_enable_sdio_irq_nolock(host, enable);
+ spin_unlock_irqrestore(&host->lock, flags);
+@@ -987,11 +1097,12 @@ static void bcm2835_sdhost_enable_sdio_i
+
+ static u32 bcm2835_sdhost_busy_irq(struct bcm2835_host *host, u32 intmask)
+ {
+- const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR |
+- SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR);
++ const u32 handled = (SDHSTS_REW_TIME_OUT | SDHSTS_CMD_TIME_OUT |
++ SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR |
++ SDHSTS_FIFO_ERROR);
+
+ if (!host->cmd) {
+- pr_err("%s: Got command busy interrupt 0x%08x even "
++ pr_err("%s: got command busy interrupt 0x%08x even "
+ "though no command operation was in progress.\n",
+ mmc_hostname(host->mmc), (unsigned)intmask);
+ bcm2835_sdhost_dumpregs(host);
+@@ -999,7 +1110,7 @@ static u32 bcm2835_sdhost_busy_irq(struc
+ }
+
+ if (!host->use_busy) {
+- pr_err("%s: Got command busy interrupt 0x%08x even "
++ pr_err("%s: got command busy interrupt 0x%08x even "
+ "though not expecting one.\n",
+ mmc_hostname(host->mmc), (unsigned)intmask);
+ bcm2835_sdhost_dumpregs(host);
+@@ -1007,14 +1118,28 @@ static u32 bcm2835_sdhost_busy_irq(struc
+ }
+ host->use_busy = 0;
+
+- if (intmask & SDHSTS_CMD_TIME_OUT)
+- host->cmd->error = -ETIMEDOUT;
+- else if (intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR |
+- SDHSTS_FIFO_ERROR))
+- host->cmd->error = -EILSEQ;
++ if (intmask & SDHSTS_ERROR_MASK)
++ {
++ pr_err("sdhost_busy_irq: intmask %x, data %p\n", intmask, host->mrq->data);
++ if (intmask & SDHSTS_CRC7_ERROR)
++ host->cmd->error = -EILSEQ;
++ else if (intmask & (SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR)) {
++ if (host->mrq->data)
++ host->mrq->data->error = -EILSEQ;
++ else
++ host->cmd->error = -EILSEQ;
++ } else if (intmask & SDHSTS_REW_TIME_OUT) {
++ if (host->mrq->data)
++ host->mrq->data->error = -ETIMEDOUT;
++ else
++ host->cmd->error = -ETIMEDOUT;
++ } else if (intmask & SDHSTS_CMD_TIME_OUT)
++ host->cmd->error = -ETIMEDOUT;
+
+- if (host->cmd->error)
++ bcm2835_sdhost_dumpregs(host);
+ tasklet_schedule(&host->finish_tasklet);
++ }
+ else
+ bcm2835_sdhost_finish_command(host);
+
+@@ -1023,8 +1148,9 @@ static u32 bcm2835_sdhost_busy_irq(struc
+
+ static u32 bcm2835_sdhost_data_irq(struct bcm2835_host *host, u32 intmask)
+ {
+- const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR |
+- SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR);
++ const u32 handled = (SDHSTS_REW_TIME_OUT |
++ SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR);
+
+ /* There are no dedicated data/space available interrupt
+ status bits, so it is necessary to use the single shared
+@@ -1034,13 +1160,19 @@ static u32 bcm2835_sdhost_data_irq(struc
+ if (!host->data)
+ return 0;
+
+- // XXX FIFO_ERROR
+- if (intmask & SDHSTS_CMD_TIME_OUT)
+- host->cmd->error = -ETIMEDOUT;
+- else if ((intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR)) &&
+- ((bcm2835_sdhost_read(host, SDCMD) & SDCMD_CMD_MASK)
+- != MMC_BUS_TEST_R))
+- host->cmd->error = -EILSEQ;
++ if (intmask & (SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR |
++ SDHSTS_REW_TIME_OUT)) {
++ if (intmask & (SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR))
++ host->data->error = -EILSEQ;
++ else
++ host->data->error = -ETIMEDOUT;
++
++ bcm2835_sdhost_dumpregs(host);
++ tasklet_schedule(&host->finish_tasklet);
++ return handled;
++ }
+
+ /* Use the block interrupt for writes after the first block */
+ if (host->data->flags & MMC_DATA_WRITE) {
+@@ -1067,31 +1199,48 @@ static u32 bcm2835_sdhost_block_irq(stru
+ {
+ struct dma_chan *dma_chan;
+ u32 dir_data;
+- const u32 handled = (SDHSTS_CMD_TIME_OUT | SDHSTS_CRC16_ERROR |
+- SDHSTS_CRC7_ERROR | SDHSTS_FIFO_ERROR);
++ const u32 handled = (SDHSTS_REW_TIME_OUT |
++ SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR);
+
+ if (!host->data) {
+- pr_err("%s: Got block interrupt 0x%08x even "
++ pr_err("%s: got block interrupt 0x%08x even "
+ "though no data operation was in progress.\n",
+ mmc_hostname(host->mmc), (unsigned)intmask);
+ bcm2835_sdhost_dumpregs(host);
+ return handled;
+ }
+
+- if (intmask & SDHSTS_CMD_TIME_OUT)
+- host->cmd->error = -ETIMEDOUT;
+- else if ((intmask & (SDHSTS_CRC16_ERROR | SDHSTS_CRC7_ERROR)) &&
+- ((bcm2835_sdhost_read(host, SDCMD) & SDCMD_CMD_MASK)
+- != MMC_BUS_TEST_R))
+- host->cmd->error = -EILSEQ;
++ if (intmask & (SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR |
++ SDHSTS_REW_TIME_OUT)) {
++ if (intmask & (SDHSTS_CRC16_ERROR |
++ SDHSTS_FIFO_ERROR))
++ host->data->error = -EILSEQ;
++ else
++ host->data->error = -ETIMEDOUT;
++
++ if (host->debug)
++ bcm2835_sdhost_dumpregs(host);
++ tasklet_schedule(&host->finish_tasklet);
++ return handled;
++ }
+
+ if (!host->use_dma) {
+ BUG_ON(!host->blocks);
+ host->blocks--;
+- if ((host->blocks == 0) || host->data->error)
++ if ((host->blocks == 0) || host->data->error) {
++ /* Cancel the timer */
++ del_timer(&host->pio_timer);
++
+ bcm2835_sdhost_finish_data(host);
+- else
++ } else {
+ bcm2835_sdhost_transfer_pio(host);
++
++ /* Reset the timer */
++ mod_timer(&host->pio_timer,
++ jiffies + host->pio_timeout);
++ }
+ } else if (host->data->flags & MMC_DATA_WRITE) {
+ dma_chan = host->dma_chan_tx;
+ dir_data = DMA_TO_DEVICE;
+@@ -1125,7 +1274,7 @@ static irqreturn_t bcm2835_sdhost_irq(in
+ SDHSTS_BLOCK_IRPT |
+ SDHSTS_SDIO_IRPT |
+ SDHSTS_DATA_FLAG);
+- if ((handled == SDHSTS_DATA_FLAG) && // XXX
++ if ((handled == SDHSTS_DATA_FLAG) &&
+ (loops == 0) && !host->data) {
+ pr_err("%s: sdhost_irq data interrupt 0x%08x even "
+ "though no data operation was in progress.\n",
+@@ -1177,10 +1326,11 @@ static irqreturn_t bcm2835_sdhost_irq(in
+ spin_unlock(&host->lock);
+
+ if (early)
+- pr_debug("%s: early %x (loops %d)\n", mmc_hostname(host->mmc), early, loops);
++ pr_debug("%s: early %x (loops %d)\n",
++ mmc_hostname(host->mmc), early, loops);
+
+ if (unexpected) {
+- pr_err("%s: Unexpected interrupt 0x%08x.\n",
++ pr_err("%s: unexpected interrupt 0x%08x.\n",
+ mmc_hostname(host->mmc), unexpected);
+ bcm2835_sdhost_dumpregs(host);
+ }
+@@ -1227,8 +1377,22 @@ void bcm2835_sdhost_set_clock(struct bcm
+ int div = 0; /* Initialized for compiler warning */
+ unsigned int input_clock = clock;
+
+- if (host->overclock_50 && (clock == 50000000))
+- clock = host->overclock_50 * 1000000 + 999999;
++ if (host->debug)
++ pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
++
++ if ((clock == 0) && host->reduce_overclock) {
++ /* This is a reset following data corruption - reduce any
++ overclock */
++ host->reduce_overclock = 0;
++ if (host->overclock_50 > 50) {
++ pr_warn("%s: reducing overclock due to errors\n",
++ mmc_hostname(host->mmc));
++ host->overclock_50--;
++ }
++ }
++
++ if (host->overclock_50 && (clock == 50*MHZ))
++ clock = host->overclock_50 * MHZ + (MHZ - 1);
+
+ /* The SDCDIV register has 11 bits, and holds (div - 2).
+ But in data mode the max is 50MHz wihout a minimum, and only the
+@@ -1275,17 +1439,34 @@ void bcm2835_sdhost_set_clock(struct bcm
+ clock = host->max_clk / (div + 2);
+ host->mmc->actual_clock = clock;
+
+- if ((clock > input_clock) && (clock > host->max_overclock)) {
+- pr_warn("%s: Overclocking to %dHz\n",
+- mmc_hostname(host->mmc), clock);
+- host->max_overclock = clock;
++ if (clock > input_clock) {
++ /* Save the closest value, to make it easier
++ to reduce in the event of error */
++ host->overclock_50 = (clock/MHZ);
++
++ if (clock != host->overclock) {
++ pr_warn("%s: overclocking to %dHz\n",
++ mmc_hostname(host->mmc), clock);
++ host->overclock = clock;
++ }
++ }
++ else if ((clock == 50 * MHZ) && host->overclock)
++ {
++ pr_warn("%s: cancelling overclock\n",
++ mmc_hostname(host->mmc));
++ host->overclock = 0;
+ }
+
+ host->cdiv = div;
+ bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
+
+- pr_debug(DRIVER_NAME ": clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n",
+- input_clock, host->max_clk, host->cdiv, host->mmc->actual_clock);
++ /* Set the timeout to 500ms */
++ bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT);
++
++ if (host->debug)
++ pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n",
++ mmc_hostname(host->mmc), input_clock,
++ host->max_clk, host->cdiv, host->mmc->actual_clock);
+ }
+
+ static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
+@@ -1293,29 +1474,32 @@ static void bcm2835_sdhost_request(struc
+ struct bcm2835_host *host;
+ unsigned long flags;
+
+- if (1) {
++ host = mmc_priv(mmc);
++
++ if (host->debug) {
+ struct mmc_command *cmd = mrq->cmd;
+- const char *src = "cmd";
+ BUG_ON(!cmd);
+- pr_debug("bcm2835_sdhost_request: %s %08x %08x (flags %x)\n",
+- src, cmd->opcode, cmd->arg, cmd->flags);
+ if (cmd->data)
+- pr_debug("bcm2835_sdhost_request: %s %d*%d\n",
+- (cmd->data->flags & MMC_DATA_READ) ?
+- "read" : "write", cmd->data->blocks,
+- cmd->data->blksz);
++ pr_info("%s: cmd %d 0x%x (flags 0x%x) - %s %d*%d\n",
++ mmc_hostname(mmc),
++ cmd->opcode, cmd->arg, cmd->flags,
++ (cmd->data->flags & MMC_DATA_READ) ?
++ "read" : "write", cmd->data->blocks,
++ cmd->data->blksz);
++ else
++ pr_info("%s: cmd %d 0x%x (flags 0x%x)\n",
++ mmc_hostname(mmc),
++ cmd->opcode, cmd->arg, cmd->flags);
+ }
+
+ if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
+- pr_err("%s: Unsupported block size (%d bytes)\n",
++ pr_err("%s: unsupported block size (%d bytes)\n",
+ mmc_hostname(mmc), mrq->data->blksz);
+ mrq->cmd->error = -EINVAL;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+- host = mmc_priv(mmc);
+-
+ spin_lock_irqsave(&host->lock, flags);
+
+ WARN_ON(host->mrq != NULL);
+@@ -1345,9 +1529,12 @@ static void bcm2835_sdhost_set_ios(struc
+ struct bcm2835_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+- pr_debug("bcm2835_sdhost_set_ios: clock %d, pwr %d, bus_width %d, timing %d, vdd %d, drv_type %d\n",
+- ios->clock, ios->power_mode, ios->bus_width,
+- ios->timing, ios->signal_voltage, ios->drv_type);
++ if (host->debug)
++ pr_info("%s: ios clock %d, pwr %d, bus_width %d, "
++ "timing %d, vdd %d, drv_type %d\n",
++ mmc_hostname(mmc),
++ ios->clock, ios->power_mode, ios->bus_width,
++ ios->timing, ios->signal_voltage, ios->drv_type);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+@@ -1396,6 +1583,7 @@ static struct mmc_host_ops bcm2835_sdhos
+ .request = bcm2835_sdhost_request,
+ .set_ios = bcm2835_sdhost_set_ios,
+ .enable_sdio_irq = bcm2835_sdhost_enable_sdio_irq,
++ .hw_reset = bcm2835_sdhost_reset,
+ .multi_io_quirk = bcm2835_sdhost_multi_io_quirk,
+ };
+
+@@ -1423,15 +1611,24 @@ static void bcm2835_sdhost_tasklet_finis
+
+ mrq = host->mrq;
+
+- /*
+- * The controller needs a reset of internal state machines
+- * upon error conditions.
+- */
+- if (((mrq->cmd && mrq->cmd->error) ||
+- (mrq->data && (mrq->data->error ||
+- (mrq->data->stop && mrq->data->stop->error))))) {
++ /* Drop the overclock after any data corruption, or after any
++ error overclocked */
++ if (mrq->data && (mrq->data->error == -EILSEQ))
++ host->reduce_overclock = 1;
++ else if (host->overclock) {
++ /* Convert timeout errors while overclocked to data errors,
++ because the system recovers better. */
++ if (mrq->cmd && mrq->cmd->error) {
++ host->reduce_overclock = 1;
++ if (mrq->cmd->error == -ETIMEDOUT)
++ mrq->cmd->error = -EILSEQ;
++ }
+
+- bcm2835_sdhost_reset(host);
++ if (mrq->data && mrq->data->error) {
++ host->reduce_overclock = 1;
++ if (mrq->data->error == -ETIMEDOUT)
++ mrq->data->error = -EILSEQ;
++ }
+ }
+
+ host->mrq = NULL;
+@@ -1450,35 +1647,37 @@ int bcm2835_sdhost_add_host(struct bcm28
+ {
+ struct mmc_host *mmc;
+ struct dma_slave_config cfg;
++ char pio_limit_string[20];
+ int ret;
+
+ mmc = host->mmc;
+
+- bcm2835_sdhost_reset(host);
++ bcm2835_sdhost_reset_internal(host);
+
+ mmc->f_max = host->max_clk;
+ mmc->f_min = host->max_clk / SDCDIV_MAX_CDIV;
+
+- /* SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK */
+- host->timeout_clk = mmc->f_max / 1000;
+-#ifdef CONFIG_ARCH_BCM2835
+- mmc->max_busy_timeout = (1 << 27) / host->timeout_clk;
+-#endif
++ mmc->max_busy_timeout = (~(unsigned int)0)/(mmc->f_max/1000);
++
++ pr_debug("f_max %d, f_min %d, max_busy_timeout %d\n",
++ mmc->f_max, mmc->f_min, mmc->max_busy_timeout);
++
+ /* host controller capabilities */
+ mmc->caps |= /* MMC_CAP_SDIO_IRQ |*/ MMC_CAP_4_BIT_DATA |
+ MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
+- MMC_CAP_NEEDS_POLL |
++ MMC_CAP_NEEDS_POLL | MMC_CAP_HW_RESET |
+ (ALLOW_CMD23 * MMC_CAP_CMD23);
+
+ spin_lock_init(&host->lock);
+
+ if (host->allow_dma) {
+- if (!host->dma_chan_tx || !host->dma_chan_rx ||
+- IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) {
+- pr_err("%s: Unable to initialise DMA channels. Falling back to PIO\n", DRIVER_NAME);
++ if (IS_ERR_OR_NULL(host->dma_chan_tx) ||
++ IS_ERR_OR_NULL(host->dma_chan_rx)) {
++ pr_err("%s: unable to initialise DMA channels. "
++ "Falling back to PIO\n",
++ mmc_hostname(mmc));
+ host->have_dma = false;
+ } else {
+- pr_info("DMA channels allocated for the SDHost driver");
+ host->have_dma = true;
+
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+@@ -1496,7 +1695,6 @@ int bcm2835_sdhost_add_host(struct bcm28
+ ret = dmaengine_slave_config(host->dma_chan_rx, &cfg);
+ }
+ } else {
+- pr_info("Forcing PIO mode\n");
+ host->have_dma = false;
+ }
+
+@@ -1512,18 +1710,23 @@ int bcm2835_sdhost_add_host(struct bcm28
+ tasklet_init(&host->finish_tasklet,
+ bcm2835_sdhost_tasklet_finish, (unsigned long)host);
+
+- setup_timer(&host->timer, bcm2835_sdhost_timeout_timer, (unsigned long)host);
++ setup_timer(&host->timer, bcm2835_sdhost_timeout,
++ (unsigned long)host);
++
++ setup_timer(&host->pio_timer, bcm2835_sdhost_pio_timeout,
++ (unsigned long)host);
+
+ bcm2835_sdhost_init(host, 0);
+ #ifndef CONFIG_ARCH_BCM2835
+ ret = request_irq(host->irq, bcm2835_sdhost_irq, 0 /*IRQF_SHARED*/,
+ mmc_hostname(mmc), host);
+ #else
+- ret = request_threaded_irq(host->irq, bcm2835_sdhost_irq, bcm2835_sdhost_thread_irq,
++ ret = request_threaded_irq(host->irq, bcm2835_sdhost_irq,
++ bcm2835_sdhost_thread_irq,
+ IRQF_SHARED, mmc_hostname(mmc), host);
+ #endif
+ if (ret) {
+- pr_err("%s: Failed to request IRQ %d: %d\n",
++ pr_err("%s: failed to request IRQ %d: %d\n",
+ mmc_hostname(mmc), host->irq, ret);
+ goto untasklet;
+ }
+@@ -1531,10 +1734,13 @@ int bcm2835_sdhost_add_host(struct bcm28
+ mmiowb();
+ mmc_add_host(mmc);
+
+- pr_info("Load BCM2835 SDHost driver\n");
+- if (host->delay_after_stop)
+- pr_info("BCM2835 SDHost: delay_after_stop=%dus\n",
+- host->delay_after_stop);
++ pio_limit_string[0] = '\0';
++ if (host->have_dma && (host->pio_limit > 0))
++ sprintf(pio_limit_string, " (>%d)", host->pio_limit);
++ pr_info("%s: %s loaded - DMA %s%s\n",
++ mmc_hostname(mmc), DRIVER_NAME,
++ host->have_dma ? "enabled" : "disabled",
++ pio_limit_string);
+
+ return 0;
+
+@@ -1562,7 +1768,7 @@ static int bcm2835_sdhost_probe(struct p
+ mmc->ops = &bcm2835_sdhost_ops;
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+- host->timeout = msecs_to_jiffies(1000);
++ host->pio_timeout = msecs_to_jiffies(500);
+ spin_lock_init(&host->lock);
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+@@ -1588,8 +1794,12 @@ static int bcm2835_sdhost_probe(struct p
+ of_property_read_u32(node,
+ "brcm,overclock-50",
+ &host->overclock_50);
++ of_property_read_u32(node,
++ "brcm,pio-limit",
++ &host->pio_limit);
+ host->allow_dma = ALLOW_DMA &&
+ !of_property_read_bool(node, "brcm,force-pio");
++ host->debug = of_property_read_bool(node, "brcm,debug");
+ }
+
+ if (host->allow_dma) {