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mmc: sdhci: work around broken dma boundary behavior

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Some SD host controllers (noticed on an integrated JMicron SD reader on an
HP Pavilion dv5-1250eo laptop) don't update the dma address register before
signaling a dma interrupt due to a dma boundary. Update the register
manually to the next boundary (by default 512KiB), at which the transfer
stopped.

As long as each transfer is at most 512KiB in size (guaranteed by a BUG_ON
in sdhci_prepare_data()) and the boundary is kept at the default value,
this fix is needed at most once per transfer. Smaller boundaries are taken
care of by counting the transferred bytes.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=28462

Signed-off-by: Mikko Vinni <mmvinni@yahoo.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Mikko Vinni 2011-04-12 09:36:18 -04:00 committed by Chris Ball
parent 6f60c22252
commit f6a03cbf43
2 changed files with 31 additions and 5 deletions
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30
drivers/mmc/host/sdhci.c
View file

@ -679,6 +679,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
host->data = data;
host->data_early = 0;
host->data->bytes_xfered = 0;
if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
host->flags |= SDHCI_REQ_USE_DMA;
@ -814,8 +815,9 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
sdhci_set_transfer_irqs(host);
/* We do not handle DMA boundaries, so set it to max (512 KiB) */
sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, data->blksz), SDHCI_BLOCK_SIZE);
/* Set the DMA boundary value and block size */
sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
data->blksz), SDHCI_BLOCK_SIZE);
sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
}
@ -1558,10 +1560,28 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
* We currently don't do anything fancy with DMA
* boundaries, but as we can't disable the feature
* we need to at least restart the transfer.
*
* According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
* should return a valid address to continue from, but as
* some controllers are faulty, don't trust them.
*/
if (intmask & SDHCI_INT_DMA_END)
sdhci_writel(host, sdhci_readl(host, SDHCI_DMA_ADDRESS),
SDHCI_DMA_ADDRESS);
if (intmask & SDHCI_INT_DMA_END) {
u32 dmastart, dmanow;
dmastart = sg_dma_address(host->data->sg);
dmanow = dmastart + host->data->bytes_xfered;
/*
* Force update to the next DMA block boundary.
*/
dmanow = (dmanow &
~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
SDHCI_DEFAULT_BOUNDARY_SIZE;
host->data->bytes_xfered = dmanow - dmastart;
DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
" next 0x%08x\n",
mmc_hostname(host->mmc), dmastart,
host->data->bytes_xfered, dmanow);
sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
}
if (intmask & SDHCI_INT_DATA_END) {
if (host->cmd) {

6
drivers/mmc/host/sdhci.h
View file

@ -202,6 +202,12 @@
#define SDHCI_MAX_DIV_SPEC_200 256
#define SDHCI_MAX_DIV_SPEC_300 2046
/*
* Host SDMA buffer boundary. Valid values from 4K to 512K in powers of 2.
*/
#define SDHCI_DEFAULT_BOUNDARY_SIZE (512 * 1024)
#define SDHCI_DEFAULT_BOUNDARY_ARG (ilog2(SDHCI_DEFAULT_BOUNDARY_SIZE) - 12)
struct sdhci_ops {
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
u32 (*read_l)(struct sdhci_host *host, int reg);