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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-01-04 16:24:05 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-01-04 16:24:05 +0000 |
| commit | e9c091b47409255cefa1672041479d850b7b991a (patch) | |
| tree | 4a88257e054c186dc878a26ffa66f370b287195e /drivers/mmc | |
| parent | ce11a161c11868f268964274edc7a26a3e063e08 (diff) | |
| download | kernel_samsung_smdk4412-e9c091b47409255cefa1672041479d850b7b991a.tar.gz kernel_samsung_smdk4412-e9c091b47409255cefa1672041479d850b7b991a.tar.bz2 kernel_samsung_smdk4412-e9c091b47409255cefa1672041479d850b7b991a.zip | |
[MMC] mmci: add data cache coherency
Since MMCI currently uses PIO to read data, we have to take steps
to ensure data cache coherency on aliasing CPU caches. Add the
necessary flush_dcache_page() calls.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/mmci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c index 166c9b0ad04..6d161c70014 100644 --- a/drivers/mmc/mmci.c +++ b/drivers/mmc/mmci.c @@ -20,6 +20,7 @@ #include <linux/mmc/host.h> #include <linux/mmc/protocol.h> +#include <asm/cacheflush.h> #include <asm/div64.h> #include <asm/io.h> #include <asm/scatterlist.h> @@ -157,6 +158,13 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN)) data->error = MMC_ERR_FIFO; status |= MCI_DATAEND; + + /* + * We hit an error condition. Ensure that any data + * partially written to a page is properly coherent. + */ + if (host->sg_len && data->flags & MMC_DATA_READ) + flush_dcache_page(host->sg_ptr->page); } if (status & MCI_DATAEND) { mmci_stop_data(host); @@ -301,6 +309,13 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs) if (remain) break; + /* + * If we were reading, and we have completed this + * page, ensure that the data cache is coherent. + */ + if (status & MCI_RXACTIVE) + flush_dcache_page(host->sg_ptr->page); + if (!mmci_next_sg(host)) break; |