Ignore this patch
On 14 December 2011 11:44, Girish K S <girish.shivananjappa@xxxxxxxxxx> wrote:
> This patch adds a check whether the host supports maximum current value
> obtained from the device's extended csd register for a selected interface
> voltage and frequency.
>
> cc: Chris Ball <cjb@xxxxxxxxxx>
> Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
> ---
> Changes in v6:
> Added the check whehter the host supports the max current value
> read from the extended csd register.
>
> Changes in v5:
> Replace break statement with appropriate return error value in
> drivers/mmc/core/mmc.c for unsupported voltage range.
>
> Changes in v4:
> updated with review comments.
>
> Changes in v3:
> updated with review comments made by chris ball. patch generated
> by rebasing to chris balls mmc-next branch.
>
> Changes in v2:
> This patch version removes some checkpatch error
>
> Changes in v1:
> This version modifies the power_class_select function prototype.
> During device enumeration, when the host tries to read the extended
> csd register after switching to higher bus width, the read fails at
> higher bus width. So the power_class_select function is modified to
> reuse the extended csd register values read with 1 bit bus width.
>
> drivers/mmc/core/mmc.c | 27 +++++++++++++++++++++++++++
> include/linux/mmc/card.h | 4 ++++
> 2 files changed, 31 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 006e932..30d1cbc 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -688,6 +688,33 @@ static int mmc_select_powerclass(struct mmc_card *card,
> pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
> EXT_CSD_PWR_CL_4BIT_SHIFT;
>
> + if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
> + if (pwrclass_val >= MMC_MAX_CURRENT_800)
> + pwrclass_val = MMC_MAX_CURRENT_800;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_600)
> + pwrclass_val = MMC_MAX_CURRENT_600;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_400)
> + pwrclass_val = MMC_MAX_CURRENT_400;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_200)
> + pwrclass_val = MMC_MAX_CURRENT_200;
> + } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
> + if (pwrclass_val >= MMC_MAX_CURRENT_600)
> + pwrclass_val = MMC_MAX_CURRENT_600;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_400)
> + pwrclass_val = MMC_MAX_CURRENT_400;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_200)
> + pwrclass_val = MMC_MAX_CURRENT_200;
> + } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
> + if (pwrclass_val >= MMC_MAX_CURRENT_400)
> + pwrclass_val = MMC_MAX_CURRENT_400;
> + else if (pwrclass_val >= MMC_MAX_CURRENT_200)
> + pwrclass_val = MMC_MAX_CURRENT_200;
> + } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
> + if (pwrclass_val >= MMC_MAX_CURRENT_200)
> + pwrclass_val = MMC_MAX_CURRENT_200;
> + } else
> + pwrclass_val = MMC_MAX_CURRENT_200;
> +
> /* If the power class is different from the default value */
> if (pwrclass_val > 0) {
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 9478a6b..c5e031a 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -195,6 +195,10 @@ struct mmc_part {
> #define MMC_BLK_DATA_AREA_GP (1<<2)
> };
>
> +#define MMC_MAX_CURRENT_200 (0)
> +#define MMC_MAX_CURRENT_400 (7)
> +#define MMC_MAX_CURRENT_600 (11)
> +#define MMC_MAX_CURRENT_800 (13)
> /*
> * MMC device
> */
> --
> 1.7.1
>
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