diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.32/911-backport-mmc_spi-use-spi-bus-locking-api.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.32/911-backport-mmc_spi-use-spi-bus-locking-api.patch | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/target/linux/generic/patches-2.6.32/911-backport-mmc_spi-use-spi-bus-locking-api.patch b/target/linux/generic/patches-2.6.32/911-backport-mmc_spi-use-spi-bus-locking-api.patch deleted file mode 100644 index cd8dc70..0000000 --- a/target/linux/generic/patches-2.6.32/911-backport-mmc_spi-use-spi-bus-locking-api.patch +++ /dev/null @@ -1,143 +0,0 @@ -From 4751c1c74bc7b596db5de0c93be1a22a570145c0 Mon Sep 17 00:00:00 2001 -From: Ernst Schwab <eschwab@online.de> -Date: Thu, 18 Feb 2010 12:47:46 +0100 -Subject: [PATCH] spi/mmc_spi: mmc_spi adaptations for SPI bus locking API - -Modification of the mmc_spi driver to use the SPI bus locking API. -With this, the mmc_spi driver can be used together with other SPI -devices on the same SPI bus. The exclusive access to the SPI bus is -now managed in the SPI layer. The counting of chip selects in the probe -function is no longer needed. - -Signed-off-by: Ernst Schwab <eschwab@online.de> -Signed-off-by: Grant Likely <grant.likely@secretlab.ca> -Tested-by: Matt Fleming <matt@console-pimps.org> -Tested-by: Antonio Ospite <ospite@studenti.unina.it> ---- - drivers/mmc/host/mmc_spi.c | 59 ++++++++----------------------------------- - 1 files changed, 11 insertions(+), 48 deletions(-) - ---- a/drivers/mmc/host/mmc_spi.c -+++ b/drivers/mmc/host/mmc_spi.c -@@ -181,7 +181,7 @@ mmc_spi_readbytes(struct mmc_spi_host *h - host->data_dma, sizeof(*host->data), - DMA_FROM_DEVICE); - -- status = spi_sync(host->spi, &host->readback); -+ status = spi_sync_locked(host->spi, &host->readback); - - if (host->dma_dev) - dma_sync_single_for_cpu(host->dma_dev, -@@ -540,7 +540,7 @@ mmc_spi_command_send(struct mmc_spi_host - host->data_dma, sizeof(*host->data), - DMA_BIDIRECTIONAL); - } -- status = spi_sync(host->spi, &host->m); -+ status = spi_sync_locked(host->spi, &host->m); - - if (host->dma_dev) - dma_sync_single_for_cpu(host->dma_dev, -@@ -684,7 +684,7 @@ mmc_spi_writeblock(struct mmc_spi_host * - host->data_dma, sizeof(*scratch), - DMA_BIDIRECTIONAL); - -- status = spi_sync(spi, &host->m); -+ status = spi_sync_locked(spi, &host->m); - - if (status != 0) { - dev_dbg(&spi->dev, "write error (%d)\n", status); -@@ -821,7 +821,7 @@ mmc_spi_readblock(struct mmc_spi_host *h - DMA_FROM_DEVICE); - } - -- status = spi_sync(spi, &host->m); -+ status = spi_sync_locked(spi, &host->m); - - if (host->dma_dev) { - dma_sync_single_for_cpu(host->dma_dev, -@@ -1017,7 +1017,7 @@ mmc_spi_data_do(struct mmc_spi_host *hos - host->data_dma, sizeof(*scratch), - DMA_BIDIRECTIONAL); - -- tmp = spi_sync(spi, &host->m); -+ tmp = spi_sync_locked(spi, &host->m); - - if (host->dma_dev) - dma_sync_single_for_cpu(host->dma_dev, -@@ -1083,6 +1083,9 @@ static void mmc_spi_request(struct mmc_h - } - #endif - -+ /* request exclusive bus access */ -+ spi_bus_lock(host->spi->master); -+ - /* issue command; then optionally data and stop */ - status = mmc_spi_command_send(host, mrq, mrq->cmd, mrq->data != NULL); - if (status == 0 && mrq->data) { -@@ -1093,6 +1096,9 @@ static void mmc_spi_request(struct mmc_h - mmc_cs_off(host); - } - -+ /* release the bus */ -+ spi_bus_unlock(host->spi->master); -+ - mmc_request_done(host->mmc, mrq); - } - -@@ -1289,23 +1295,6 @@ mmc_spi_detect_irq(int irq, void *mmc) - return IRQ_HANDLED; - } - --struct count_children { -- unsigned n; -- struct bus_type *bus; --}; -- --static int maybe_count_child(struct device *dev, void *c) --{ -- struct count_children *ccp = c; -- -- if (dev->bus == ccp->bus) { -- if (ccp->n) -- return -EBUSY; -- ccp->n++; -- } -- return 0; --} -- - static int mmc_spi_probe(struct spi_device *spi) - { - void *ones; -@@ -1337,32 +1326,6 @@ static int mmc_spi_probe(struct spi_devi - return status; - } - -- /* We can use the bus safely iff nobody else will interfere with us. -- * Most commands consist of one SPI message to issue a command, then -- * several more to collect its response, then possibly more for data -- * transfer. Clocking access to other devices during that period will -- * corrupt the command execution. -- * -- * Until we have software primitives which guarantee non-interference, -- * we'll aim for a hardware-level guarantee. -- * -- * REVISIT we can't guarantee another device won't be added later... -- */ -- if (spi->master->num_chipselect > 1) { -- struct count_children cc; -- -- cc.n = 0; -- cc.bus = spi->dev.bus; -- status = device_for_each_child(spi->dev.parent, &cc, -- maybe_count_child); -- if (status < 0) { -- dev_err(&spi->dev, "can't share SPI bus\n"); -- return status; -- } -- -- dev_warn(&spi->dev, "ASSUMING SPI bus stays unshared!\n"); -- } -- - /* We need a supply of ones to transmit. This is the only time - * the CPU touches these, so cache coherency isn't a concern. - * |