From: Ulf Hansson <ulf.hansson@linaro.org>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: linux-mmc <linux-mmc@vger.kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Chris Ball <chris@printf.net>,
Russell King <linux@arm.linux.org.uk>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>
Subject: Re: [PATCH v2 2/4] mmc: mmci: move block size validation under relevant code
Date: Tue, 19 Aug 2014 13:55:37 +0200 [thread overview]
Message-ID: <CAPDyKFok=r__hx1RaXFgttCQkeocSADY59nSPTZ6DUXQdddBRg@mail.gmail.com> (raw)
In-Reply-To: <1408446866-1649-1-git-send-email-srinivas.kandagatla@linaro.org>
On 19 August 2014 13:14, Srinivas Kandagatla
<srinivas.kandagatla@linaro.org> wrote:
> This code moves a BUG_ON condition to relevant if block, this check is
> not necessary for IPs which can set any arbitrary block size in a given
> range.
> This patch is necessary for SDIO which sets block sizes that are exactly
> not power of 2.
>
> Original issue detected while testing WLAN ath6kl on Qualcomm APQ8064 SOC.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
> drivers/mmc/host/mmci.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
> index 3089fba..1c99195 100644
> --- a/drivers/mmc/host/mmci.c
> +++ b/drivers/mmc/host/mmci.c
> @@ -800,15 +800,16 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
> writel(timeout, base + MMCIDATATIMER);
> writel(host->size, base + MMCIDATALENGTH);
>
> - blksz_bits = ffs(data->blksz) - 1;
> - BUG_ON(1 << blksz_bits != data->blksz);
I don't like this BUG_ON at all, I would prefer if we remove it. The
original patch "mmc: mmci: Support any block sizes for ux500v2", did
so as well.
Now, if we still think removing it is fragile, let additional tests in
mmci_validate_data() and return and error code from there.
Kind regards
Uffe
>
> - if (variant->blksz_datactrl16)
> + if (variant->blksz_datactrl16) {
> datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
> - else if (variant->blksz_datactrl4)
> + } else if (variant->blksz_datactrl4) {
> datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
> - else
> + } else {
> + blksz_bits = ffs(data->blksz) - 1;
> + BUG_ON(1 << blksz_bits != data->blksz);
> datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
> + }
>
> if (data->flags & MMC_DATA_READ)
> datactrl |= MCI_DPSM_DIRECTION;
> --
> 1.9.1
>
next prev parent reply other threads:[~2014-08-19 11:55 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-12 12:02 [PATCH RFC 0/5] mmc: mmci: sdio related fixes Srinivas Kandagatla
2014-08-12 12:03 ` [PATCH RFC 1/5] mmc: mmci: Enable SDIO support for Qualcomm variant data Srinivas Kandagatla
2014-08-12 12:03 ` [PATCH RFC 2/5] mmc: mmci: move block size validation under relevant code Srinivas Kandagatla
2014-08-12 12:04 ` [PATCH RFC 3/5] mmc: mmci: relax blksz check for SDIO Srinivas Kandagatla
2014-08-12 14:12 ` Russell King - ARM Linux
2014-08-13 5:14 ` Srinivas Kandagatla
2014-08-13 8:54 ` Linus Walleij
2014-08-12 12:05 ` [PATCH RFC 4/5] mmc: mmci: Add sdio enable mask in variant data Srinivas Kandagatla
2014-08-13 8:55 ` Linus Walleij
2014-08-12 12:05 ` [PATCH RFC 5/5] mmc: mmci: move ST specific sdio setup under a condition Srinivas Kandagatla
2014-08-13 8:58 ` Linus Walleij
2014-08-13 9:45 ` Srinivas Kandagatla
2014-08-19 11:13 ` [PATCH v2 0/4] mmc: mmci: sdio related fixes Srinivas Kandagatla
2014-08-19 11:14 ` [PATCH v2 1/4] mmc: mmci: Support any block sizes for ux500v2 and qcom variant Srinivas Kandagatla
2014-08-19 12:37 ` Ulf Hansson
2014-08-19 11:14 ` [PATCH v2 2/4] mmc: mmci: move block size validation under relevant code Srinivas Kandagatla
2014-08-19 11:55 ` Ulf Hansson [this message]
2014-08-19 12:08 ` Srinivas Kandagatla
2014-08-19 11:15 ` [PATCH v2 3/4] mmc: mmci: Add sdio enable mask in variant data Srinivas Kandagatla
2014-08-19 11:15 ` [PATCH v2 4/4] mmc: mmci: rename sdio flag in vendor data to st_sdio Srinivas Kandagatla
2014-08-22 4:53 ` [PATCH v3 0/3] mmc: mmci: sdio related fixes Srinivas Kandagatla
2014-08-22 4:54 ` [PATCH v3 1/3] mmc: mmci: Support any block sizes for ux500v2 and qcom variant Srinivas Kandagatla
2014-09-10 7:58 ` Ulf Hansson
2014-09-10 9:07 ` Srinivas Kandagatla
2014-09-10 10:51 ` Ulf Hansson
2015-07-09 21:40 ` Bjorn Andersson
2019-03-05 22:25 ` Linus Walleij
2019-03-06 17:03 ` Bjorn Andersson
2014-08-22 4:54 ` [PATCH v3 2/3] mmc: mmci: Add sdio enable mask in variant data Srinivas Kandagatla
2014-09-10 7:47 ` Ulf Hansson
2014-08-22 4:55 ` [PATCH v3 3/3] mmc: mmci: rename sdio flag in vendor data to st_sdio Srinivas Kandagatla
2014-09-10 7:48 ` Ulf Hansson
2014-09-09 8:34 ` [PATCH] mmc: mmci_qcom_dml: fix is never less than zero warning Srinivas Kandagatla
2014-09-09 11:53 ` Ulf Hansson
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