On Fri, Jun 5, 2015 at 3:06 AM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> Commit 3a48edc4bd68 ("mmc: sdhci: Use mmc core regulator infrastucture")
> changed the behavior for how to assign the ocr_avail mask for the mmc
> host. More precisely it started to mask the bits instead of assigning
> them.
>
> Restore the behavior, but also make it clear that an OCR mask created
> from an external regulator overrides the other ones.
>
> Fixes: 3a48edc4bd68 ("mmc: sdhci: Use mmc core regulator infrastucture")
> Cc: Tim Kryger <tim.kryger@xxxxxxxxx>
> Reported-by: Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx>
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 1b4861d..706bb60 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3256,13 +3256,14 @@ int sdhci_add_host(struct sdhci_host *host)
> SDHCI_MAX_CURRENT_MULTIPLIER;
> }
>
> - /* If OCR set by external regulators, use it instead */
> + /* If OCR set by host, use it instead. */
> + if (host->ocr_mask)
> + ocr_avail = host->ocr_mask;
> +
> + /* If OCR set by external regulators, give it highest prio. */
> if (mmc->ocr_avail)
> ocr_avail = mmc->ocr_avail;
>
> - if (host->ocr_mask)
> - ocr_avail &= host->ocr_mask;
> -
> mmc->ocr_avail = ocr_avail;
> mmc->ocr_avail_sdio = ocr_avail;
> if (host->ocr_avail_sdio)
> --
> 1.9.1
>
The patch looks good. Perhaps include this in the commit message.
The OCR mask is determined by one of the following with this priority:
1. Supported ranges of external regulator if one supplies VDD
2. Host OCR mask if set by the driver (based on DT properties)
3. The capabilities reported by the controller itself
Reviewed-by: Tim Kryger <tim.kryger@xxxxxxxxx>
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