On 24 October 2011 15:40, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> Turning the cache off implies flushing cache which doesn't define
> maximum timeout unlike cache-on. This patch will apply the generic
> CMD6 timeout only for cache-on. Additionally the kernel message is
> added for checking failure case of cache-on.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 22 +++++++++++++---------
> drivers/mmc/core/mmc.c | 10 ++++++++--
> 2 files changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 5278ffb..65b5643 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2248,6 +2248,7 @@ EXPORT_SYMBOL(mmc_flush_cache);
> int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
> {
> struct mmc_card *card = host->card;
> + unsigned int timeout;
> int err = 0;
>
> if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
> @@ -2258,16 +2259,19 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
> (card->ext_csd.cache_size > 0)) {
> enable = !!enable;
>
> - if (card->ext_csd.cache_ctrl ^ enable)
> + if (card->ext_csd.cache_ctrl ^ enable) {
> + timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> - EXT_CSD_CACHE_CTRL, enable, 0);
Here timeout value used is 0. If it has to be 0 then why should you check
timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
I think it should be card->ext_csd.generic_cmd6_time instead of 0
> - if (err)
> - pr_err("%s: cache %s error %d\n",
> - mmc_hostname(card->host),
> - enable ? "on" : "off",
> - err);
> - else
> - card->ext_csd.cache_ctrl = enable;
> + EXT_CSD_CACHE_CTRL, enable, timeout);
> +
> + if (err)
> + pr_err("%s: cache %s error %d\n",
> + mmc_hostname(card->host),
> + enable ? "on" : "off",
> + err);
> + else
> + card->ext_csd.cache_ctrl = enable;
> + }
> }
>
> return err;
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index fb5bf01..6354eb3 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1064,14 +1064,20 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
> card->ext_csd.cache_size > 0) {
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> - EXT_CSD_CACHE_CTRL, 1, 0);
> + EXT_CSD_CACHE_CTRL, 1,
> + card->ext_csd.generic_cmd6_time);
> if (err && err != -EBADMSG)
> goto free_card;
>
> /*
> * Only if no error, cache is turned on successfully.
> */
> - card->ext_csd.cache_ctrl = err ? 0 : 1;
> + if (err) {
> + pr_warning("%s: Cache is supported, but enabling failed\n",
> + mmc_hostname(card->host));
> + err = 0;
> + } else
> + card->ext_csd.cache_ctrl = 1;
> }
>
> if (!oldcard)
> --
> 1.7.0.4
>
>
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