On Thu, 19 Jun 2025 at 11:03, Avri Altman avri.altman@sandisk.com wrote:

...

The SD current limit logic is updated to avoid explicitly setting the current limit when the maximum power is 200mA (0.72W) or less, as this is already the default value. The code now only issues a current limit switch if a higher limit is required, and the unused SD_SET_CURRENT_NO_CHANGE constant is removed. This reduces

unnecessary

...

commands and simplifies the logic.

Fixes: 0aa6770000ba ("mmc: sdhci: only set 200mA support for 1.8v if 200mA is available") Signed-off-by: Avri Altman avri.altman@sandisk.com Cc: stable@vger.kernel.org

I am not sure there is really a bug here. To me, it rather looks like an optimization, as we are avoiding one unnecessary switch command.

Done.

Thanks, Avri

Otherwise this looks good to me.

Kind regards Uffe

...

---

drivers/mmc/core/sd.c | 7 ++----- include/linux/mmc/card.h | 1 - 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index ec02067f03c5..cf92c5b2059a 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -554,7 +554,7 @@ static u32 sd_get_host_max_current(struct

mmc_host

...

*host)

static int sd_set_current_limit(struct mmc_card *card, u8 *status) {

•   int current_limit = SD_SET_CURRENT_NO_CHANGE;
  

•   int current_limit = SD_SET_CURRENT_LIMIT_200;
    int err;
    u32 max_current;
  
  

@@ -598,11 +598,8 @@ static int sd_set_current_limit(struct mmc_card

*card, u8 *status)

...

    else if (max_current >= 400 &&
             card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
            current_limit = SD_SET_CURRENT_LIMIT_400;

•   else if (max_current >= 200 &&
  

•            card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
  

•           current_limit = SD_SET_CURRENT_LIMIT_200;
  
  

•   if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
  

•   if (current_limit != SD_SET_CURRENT_LIMIT_200) {
            err = mmc_sd_switch(card, SD_SWITCH_SET, 3,
                            current_limit, status);
            if (err)
  

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index ddcdf23d731c..e9e964c20e53 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -182,7 +182,6 @@ struct sd_switch_caps { #define SD_SET_CURRENT_LIMIT_400 1 #define SD_SET_CURRENT_LIMIT_600 2 #define SD_SET_CURRENT_LIMIT_800 3 -#define SD_SET_CURRENT_NO_CHANGE (-1)

#define SD_MAX_CURRENT_200 (1 << SD_SET_CURRENT_LIMIT_200)

#define SD_MAX_CURRENT_400 (1 << SD_SET_CURRENT_LIMIT_400)

2.25.1