Re: [PATCH] mmc: sdhci-omap: re-tuning is needed after a pm transition to support emmc HS200 mode

[Adrian Hunter <adrian.hunter@intel.com>]

On 16/03/24 01:44, Romain Naour wrote:
> From: Romain Naour <romain.naour@skf.com>
> 
> "PM runtime functions" has been added in sdhci-omap driver in 5.16
> f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions") along
> with "card power off and enable aggressive PM" 3edf588e7fe0

checkpatch expects "commit" before commit numbers i.e.

ERROR: Please use git commit description style 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions")'
#9: 
f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions") along

ERROR: Please use git commit description style 'commit <12+ chars of sha1> ("<title line>")' - ie: 'commit 3edf588e7fe0 ("mmc: sdhci-omap: Allow SDIO card power off and enable aggressive PM")'
#10: 
with "card power off and enable aggressive PM" 3edf588e7fe0

> ("mmc: sdhci-omap: Allow SDIO card power off and enable aggressive PM").
> 
> Since then, the sdhci-omap driver doesn't work using mmc-hs200 mode
> due to the tuning values being lost during a pm transition.
> See the report on the linux-omap mailing list [1].
> 
> As for the sdhci_am654 driver, request a new tuning sequence before
> suspend (sdhci_omap_runtime_suspend()), othwerwise the device will

othwerwise -> otherwise

> thigger cache flush errors:

thigger -> trigger

> 
>   mmc1: cache flush error -110 (ETIMEDOUT)
>   mmc1: error -110 doing aggressive suspend
> 
> followed by I/O errors produced by fdisk -l /dev/mmcblk1boot1:
> 
>   I/O error, dev mmcblk1boot0, sector 64384 op 0x0:(READ) flags 0x80700 phys_seg 1
>   prio class 2
>   I/O error, dev mmcblk1boot1, sector 64384 op 0x0:(READ) flags 0x80700 phys_seg 1
>   prio class 2
>   I/O error, dev mmcblk1boot1, sector 64384 op 0x0:(READ) flags 0x0 phys_seg 1
>   prio class 2
>   Buffer I/O error on dev mmcblk1boot1, logical block 8048, async page read
>   I/O error, dev mmcblk1boot0, sector 64384 op 0x0:(READ) flags 0x0 phys_seg 1
>   prio class 2
>   Buffer I/O error on dev mmcblk1boot0, logical block 8048, async page read
> 
> Don't re-tune if auto retuning is supported in HW (when SDHCI_TUNING_MODE_3
> is available).
> 
> [1] https://lore.kernel.org/all/2e5f1997-564c-44e4-b357-6343e0dae7ab@smile.fr
> 
> Fixes: f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions")

Cc stable?

> Signed-off-by: Romain Naour <romain.naour@skf.com>

Minor cosmetics, otherwise:

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

> ---
>  drivers/mmc/host/sdhci-omap.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index e78faef67d7a..94076b095571 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -1439,6 +1439,9 @@ static int __maybe_unused sdhci_omap_runtime_suspend(struct device *dev)
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
>  
> +	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> +		mmc_retune_needed(host->mmc);
> +
>  	if (omap_host->con != -EINVAL)
>  		sdhci_runtime_suspend_host(host);
>