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Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1292-fix-glamo-mci-slow-clock-until-first-bulk.patch.patch')
-rw-r--r--target/linux/s3c24xx/patches-2.6.24/1292-fix-glamo-mci-slow-clock-until-first-bulk.patch.patch261
1 files changed, 0 insertions, 261 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1292-fix-glamo-mci-slow-clock-until-first-bulk.patch.patch b/target/linux/s3c24xx/patches-2.6.24/1292-fix-glamo-mci-slow-clock-until-first-bulk.patch.patch
deleted file mode 100644
index 642f545..0000000
--- a/target/linux/s3c24xx/patches-2.6.24/1292-fix-glamo-mci-slow-clock-until-first-bulk.patch.patch
+++ /dev/null
@@ -1,261 +0,0 @@
-From 9e7ba57b104e9293f746342b7450b10d5fa0c4cd Mon Sep 17 00:00:00 2001
-From: Andy Green <andy@openmoko.com>
-Date: Mon, 22 Sep 2008 22:38:03 +0100
-Subject: [PATCH] fix-glamo-mci-slow-clock-until-first-bulk.patch
-
-This patch adds another module parameter to glamo-mci which sets the
-SD Card clock rate used inbetween powering the card and the completion of
-the first bulk transfer. You can set it from kernel commandline like this.
-
-glamo_mci.sd_post_power_clock=1000000
-
-The period between changing the power state and the first bulk transfer
-completion is critical because larger SDHC cards take longer to initialize
-before they can service the bulk transfer, and the Glamo MMC unit has a
-fixed timeout length of a maximum of 4095 x 16 x SD Card clocks. Large
-cards like 8GB Sandisk SDHC are not ready before this timeout is used up
-at default 16MHz.
-
-Subsequently, the card can handle 16MHz SD Clock and timeout durations
-okay.
-
-By default this patch operates the SD Clock at only 1MHz until the first
-bulk transfer is completed after each powerup action from the MCI stack. It
-also keeps the SD Clock running during this time, and disables the SD Clock
-if the card is not present and the MCI stack removes power.
-
-Signed-off-by: Andy Green <andy@openmoko.com>
----
- drivers/mfd/glamo/glamo-mci.c | 108 +++++++++++++++++++++++++----------------
- drivers/mfd/glamo/glamo-mci.h | 2 +
- 2 files changed, 68 insertions(+), 42 deletions(-)
-
-diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
-index 3eece08..cff43db 100644
---- a/drivers/mfd/glamo/glamo-mci.c
-+++ b/drivers/mfd/glamo/glamo-mci.c
-@@ -74,6 +74,23 @@ static int sd_slow_ratio = 8;
- module_param(sd_slow_ratio, int, 0644);
-
- /*
-+ * Post-power SD clock rate
-+ *
-+ * you can override this on kernel commandline using
-+ *
-+ * glamo_mci.sd_post_power_clock=1000000
-+ *
-+ * for example
-+ *
-+ * After changing power to card, clock is held at this rate until first bulk
-+ * transfer completes
-+ */
-+
-+static int sd_post_power_clock = 1000000;
-+module_param(sd_post_power_clock, int, 0644);
-+
-+
-+/*
- * SD Signal drive strength
- *
- * you can override this on kernel commandline using
-@@ -240,21 +257,35 @@ static void __glamo_mci_fix_card_div(struct glamo_mci_host *host, int div)
- writew(readw(glamo_mci_def_pdata.pglamo->base +
- GLAMO_REG_CLOCK_GEN5_1) & (~GLAMO_CLOCK_GEN51_EN_DIV_TCLK),
- glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
-- } else {
-- /* set the nearest prescaler factor
-- *
-- * register shared with SCLK divisor -- no chance of race because
-- * we don't use sensor interface
-- */
-- writew_dly((readw(glamo_mci_def_pdata.pglamo->base +
-- GLAMO_REG_CLOCK_GEN8) & 0xff00) | div,
-- glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
-- /* enable clock to divider input */
-- writew_dly(readw(glamo_mci_def_pdata.pglamo->base +
-- GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
-- glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
-+
-+ goto done;
- }
-
-+ if (host->force_slow_during_powerup)
-+ div = host->clk_rate / sd_post_power_clock;
-+ else
-+ if (host->pdata->glamo_mci_use_slow)
-+ if ((host->pdata->glamo_mci_use_slow)())
-+ div = div * sd_slow_ratio;
-+
-+ if (div > 255)
-+ div = 255;
-+
-+ /*
-+ * set the nearest prescaler factor
-+ *
-+ * register shared with SCLK divisor -- no chance of race because
-+ * we don't use sensor interface
-+ */
-+ writew_dly((readw(glamo_mci_def_pdata.pglamo->base +
-+ GLAMO_REG_CLOCK_GEN8) & 0xff00) | div,
-+ glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN8);
-+ /* enable clock to divider input */
-+ writew_dly(readw(glamo_mci_def_pdata.pglamo->base +
-+ GLAMO_REG_CLOCK_GEN5_1) | GLAMO_CLOCK_GEN51_EN_DIV_TCLK,
-+ glamo_mci_def_pdata.pglamo->base + GLAMO_REG_CLOCK_GEN5_1);
-+
-+done:
- spin_unlock_irqrestore(&clock_lock, flags);
- }
-
-@@ -284,7 +315,7 @@ static int __glamo_mci_set_card_clock(struct glamo_mci_host *host, int freq,
- if (division)
- *division = 0xff;
-
-- if (!sd_idleclk)
-+ if (!sd_idleclk && !host->force_slow_during_powerup)
- /* clock off */
- __glamo_mci_fix_card_div(host, -1);
- }
-@@ -327,6 +358,10 @@ static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
- goto done;
- }
-
-+ /* disable the initial slow start after first bulk transfer */
-+ if (host->force_slow_during_powerup)
-+ host->force_slow_during_powerup--;
-+
- if (host->pio_active == XFER_READ)
- do_pio_read(host);
-
-@@ -341,7 +376,7 @@ static void glamo_mci_irq(unsigned int irq, struct irq_desc *desc)
- host->cmd_is_stop = 0;
- }
-
-- if (!sd_idleclk)
-+ if (!sd_idleclk && !host->force_slow_during_powerup)
- /* clock off */
- __glamo_mci_fix_card_div(host, -1);
-
-@@ -357,7 +392,6 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
- {
- u8 u8a[6];
- u16 fire = 0;
-- u16 timeout = 0xfff; /* max glamo MMC timeout, in units of 16 clocks */
-
- /* if we can't do it, reject as busy */
- if (!readw_dly(host->base + GLAMO_REG_MMC_RB_STAT1) &
-@@ -467,15 +501,9 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
- fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
- break;
- }
-- /* enforce timeout, clipping at default 65520 clocks if larger */
-- if (cmd->data)
-- /* so long as there is one... */
-- if (cmd->data->timeout_clks &&
-- /* ... and it is not longer than we can handle */
-- (cmd->data->timeout_clks <= 0xffff))
-- timeout = cmd->data->timeout_clks >> 4; /* / 16 clks */
-
-- writew(timeout, host->base + GLAMO_REG_MMC_TIMEOUT);
-+ /* always largest timeout */
-+ writew(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
-
- /* Generate interrupt on txfer */
- writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) & 0x3e) |
-@@ -576,14 +604,7 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
- /* resume requested clock rate
- * scale it down by sd_slow_ratio if platform requests it
- */
-- if (host->pdata->glamo_mci_use_slow)
-- if ((host->pdata->glamo_mci_use_slow)())
-- __glamo_mci_fix_card_div(host, host->clk_div *
-- sd_slow_ratio);
-- else
-- __glamo_mci_fix_card_div(host, host->clk_div);
-- else
-- __glamo_mci_fix_card_div(host, host->clk_div);
-+ __glamo_mci_fix_card_div(host, host->clk_div);
-
- if (glamo_mci_send_command(host, cmd))
- goto bail;
-@@ -633,6 +654,7 @@ static void glamo_mci_send_request(struct mmc_host *mmc)
- goto done;
- if (!(cmd->data->flags & (MMC_DATA_READ | MMC_DATA_WRITE)))
- goto done;
-+
- /*
- * Otherwise can can use the interrupt as async completion --
- * if there is read data coming, or we wait for write data to complete,
-@@ -676,7 +698,7 @@ done:
- host->mrq = NULL;
- mmc_request_done(host->mmc, cmd->mrq);
- bail:
-- if (!sd_idleclk)
-+ if (!sd_idleclk && !host->force_slow_during_powerup)
- /* stop the clock to card */
- __glamo_mci_fix_card_div(host, -1);
- }
-@@ -718,6 +740,12 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
- switch(ios->power_mode) {
- case MMC_POWER_ON:
- case MMC_POWER_UP:
-+ /*
-+ * we should use very slow clock until first bulk
-+ * transfer completes OK
-+ */
-+ host->force_slow_during_powerup = 1;
-+
- if (host->vdd_current != ios->vdd) {
- host->pdata->glamo_set_mci_power(ios->power_mode,
- ios->vdd);
-@@ -734,6 +762,9 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
- default:
- if (host->power_mode_current == MMC_POWER_OFF)
- break;
-+ /* never want clocking with dead card */
-+ __glamo_mci_fix_card_div(host, -1);
-+
- glamo_engine_disable(glamo_mci_def_pdata.pglamo,
- GLAMO_ENGINE_MMC);
- host->pdata->glamo_set_mci_power(MMC_POWER_OFF, 0);
-@@ -751,7 +782,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
- if (powering)
- msleep(1);
-
-- if (!sd_idleclk)
-+ if (!sd_idleclk && !host->force_slow_during_powerup)
- /* stop the clock to card, because we are idle until transfer */
- __glamo_mci_fix_card_div(host, -1);
-
-@@ -954,14 +985,7 @@ static int glamo_mci_suspend(struct platform_device *dev, pm_message_t state)
- * make sure the clock was running during suspend and consequently
- * resume
- */
-- if (host->pdata->glamo_mci_use_slow)
-- if ((host->pdata->glamo_mci_use_slow)())
-- __glamo_mci_fix_card_div(host, host->clk_div *
-- sd_slow_ratio);
-- else
-- __glamo_mci_fix_card_div(host, host->clk_div);
-- else
-- __glamo_mci_fix_card_div(host, host->clk_div);
-+ __glamo_mci_fix_card_div(host, host->clk_div);
-
- /* we are going to do more commands to override this in
- * mmc_suspend_host(), so we need to change sd_idleclk for the
-diff --git a/drivers/mfd/glamo/glamo-mci.h b/drivers/mfd/glamo/glamo-mci.h
-index f3f170e..38f6376 100644
---- a/drivers/mfd/glamo/glamo-mci.h
-+++ b/drivers/mfd/glamo/glamo-mci.h
-@@ -44,6 +44,8 @@ struct glamo_mci_host {
- unsigned long real_rate;
- u8 prescaler;
-
-+ int force_slow_during_powerup;
-+
- unsigned sdiimsk;
- int dodma;
-
---
-1.5.6.5
-
generated by cgit v1.1 at 2024-11-19 02:49:25 +0000