| Message ID | 1407845080-8353-1-git-send-email-srinivas.kandadgatla@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Tue, Aug 12, 2014 at 01:04:40PM +0100, Srinivas Kandagatla wrote: > From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > > This patch adds condition in mmci_validate_data to skip checking > blocksize for SDIO card types. SDIO card type can issue blocksizes > which are not exactly power of 2 so this check always fails, resulting > in SDIO failures. Do you understand why this check is there? Do you realise that the standard MMCI from ARM Ltd can /only/ perform power-of-2 block transfers? Hence, NAK on this change as it stands.
Thankyou for the feedback. On 12/08/14 15:12, Russell King - ARM Linux wrote: > On Tue, Aug 12, 2014 at 01:04:40PM +0100, Srinivas Kandagatla wrote: >> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> >> >> This patch adds condition in mmci_validate_data to skip checking >> blocksize for SDIO card types. SDIO card type can issue blocksizes >> which are not exactly power of 2 so this check always fails, resulting >> in SDIO failures. > > Do you understand why this check is there? > > Do you realise that the standard MMCI from ARM Ltd can /only/ perform > power-of-2 block transfers? Yes, I noticed that in pl180 TRM. I agree this patch will break standard MMCI. In the past Ulf Hansson and Stefan Nilsson have submitted a patch to fix this issue for ux500v2. This patch adds new flag non_power_of_2_blksize / any_blksize to variant_data. http://www.spinics.net/lists/linux-mmc/msg12160.html http://marc.info/?l=linux-mmc&m=131710963908853&w=2 This patch will fix the issue for Qcom too. If you are Ok with adding new flag non_power_of_2_blksize/any_blksize in the variant_data, I can rebase and include Ulf's patch in next version. thanks, --srini > > Hence, NAK on this change as it stands. > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Aug 13, 2014 at 7:14 AM, Srinivas Kandagatla <srinivas.kandagatla@linaro.org> wrote: > In the past Ulf Hansson and Stefan Nilsson have submitted a patch to fix > this issue for ux500v2. This patch adds new flag non_power_of_2_blksize / > any_blksize to variant_data. That's the right approach. It makes non-2^n support the exception rather than the rule and applies only to the variants relevant so the logic is right. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 99fe80a..747aba0 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -240,6 +240,10 @@ static int mmci_validate_data(struct mmci_host *host, if (!data) return 0; + /* sdio could have sizes which are not power of 2 */ + if (host->mmc->card && mmc_card_sdio(host->mmc->card)) + return 0; + if (!is_power_of_2(data->blksz)) { dev_err(mmc_dev(host->mmc), "unsupported block size (%d bytes)\n", data->blksz);