From f6a03cbf43e586211f8ea088148c8ecd3fc4b5be Mon Sep 17 00:00:00 2001 From: Mikko Vinni Date: Tue, 12 Apr 2011 09:36:18 -0400 Subject: [PATCH] mmc: sdhci: work around broken dma boundary behavior 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 Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci.c | 30 +++++++++++++++++++++++++----- drivers/mmc/host/sdhci.h | 6 ++++++ 2 files changed, 31 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index ab17344fc7b3..2ac0b6887ef7 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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) { diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 25e8bde600d1..85750a94c612 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -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); -- GitLab