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 signalling a dma interrupt due to a dma boundary. Detect this and update the register to the next 512KB boundary, at which the transfer presumably stopped. As long as each transfer is at most 512KB in size (on this hardware the max seems to be 65536 bytes), this fix is neeeded at most once per transfer. Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=28462 Signed-off-by: Mikko Vinni <mmvinni@xxxxxxxxx> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index a25db42..469cf74 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1537,9 +1537,27 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) * boundaries, but as we can't disable the feature * we need to at least restart the transfer. */ - 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 = sdhci_readl(host, SDHCI_DMA_ADDRESS); + if (dmanow == dmastart) { + /* + * HW failed to increase the address. + * Update to the next 512KB block boundary. + */ + dmanow = (dmanow & ~0x7ffff) + 0x80000; + if (dmanow > dmastart + host->data->blksz * + host->data->blocks) { + WARN_ON(1); + dmanow = dmastart; + } + DBG("%s: next DMA address forced " + "from 0x%08x to 0x%08x\n", + mmc_hostname(host->mmc), dmastart, dmanow); + } + sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS); + } if (intmask & SDHCI_INT_DATA_END) { if (host->cmd) { -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
