From c9b74c5b8fb807187f6b1db09012828fcd2d7e73 Mon Sep 17 00:00:00 2001 From: Pierre Ossman Date: Fri, 18 Apr 2008 20:41:49 +0200 Subject: [PATCH] sdhci: don't check block count for progress The specification is insufficiently strict when it comes to how the hardware should update the block count register, making it useless for checking transfer progress. Signed-off-by: Pierre Ossman --- drivers/mmc/host/sdhci.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index b413aa6..9b06c60 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -567,7 +567,6 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, static void sdhci_finish_data(struct sdhci_host *host) { struct mmc_data *data; - u16 blocks; BUG_ON(!host->data); @@ -580,20 +579,16 @@ static void sdhci_finish_data(struct sdhci_host *host) } /* - * Controller doesn't count down when in single block mode. + * The specification states that the block count register must + * be updated, but it does not specify at what point in the + * data flow. That makes the register entirely useless to read + * back so we have to assume that nothing made it to the card + * in the event of an error. */ - if (data->blocks == 1) - blocks = (data->error == 0) ? 0 : 1; + if (data->error) + data->bytes_xfered = 0; else - blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT); - data->bytes_xfered = data->blksz * (data->blocks - blocks); - - if (!data->error && blocks) { - printk(KERN_ERR "%s: Controller signalled completion even " - "though there were blocks left.\n", - mmc_hostname(host->mmc)); - data->error = -EIO; - } + data->bytes_xfered = data->blksz * data->blocks; if (data->stop) { /* @@ -1466,7 +1461,7 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot) mmc->ops = &sdhci_ops; mmc->f_min = host->max_clk / 256; mmc->f_max = host->max_clk; - mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MULTIWRITE | MMC_CAP_SDIO_IRQ; + mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; if (caps & SDHCI_CAN_DO_HISPD) mmc->caps |= MMC_CAP_SD_HIGHSPEED; -- 2.7.4