On 19 August 2014 13:14, Srinivas Kandagatla
<srinivas.kandagatla@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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
>
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