Re: [PATCH] mmc: sdhci-of-dwcmshc: downgrade HS200/HS400 clock-reduce message to dev_dbg

[Adrian Hunter]

On 09/10/2026 11:46, Jun Yan wrote:
> dwcmshc_rk3568_set_clock() refuses to lower the bus clock below 52 MHz
> when the eMMC is in HS200/HS400 mode, since those modes require a
> minimum 52 MHz bus clock.  This is expected behaviour, but it is
> currently reported at dev_err level and therefore fires on every boot
> and on every suspend/resume cycle, cluttering the kernel log.
> 
> Demote the message to dev_dbg so it stays out of the default log while
> remaining available via dynamic debug.
> 
> Signed-off-by: Jun Yan <jerrysteve1101@xxxxxxxxx>

Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>

> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index c688f3eaf468..b4fb1c1e6d99 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -790,7 +790,7 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock
>  	if (clock <= 52000000) {
>  		if (host->mmc->ios.timing == MMC_TIMING_MMC_HS200 ||
>  		    host->mmc->ios.timing == MMC_TIMING_MMC_HS400) {
> -			dev_err(mmc_dev(host->mmc),
> +			dev_dbg(mmc_dev(host->mmc),
>  				"Can't reduce the clock below 52MHz in HS200/HS400 mode");
>  			goto enable_clk;
>  		}