Hi Marcin,
On mar., oct. 06 2015, Marcin Wojtas <mw@xxxxxxxxxxxx> wrote:
> From: Nadav Haklai <nadavh@xxxxxxxxxxx>
>
> According to 'FE-2946959' erratum the clock inversion option is
> needed to support slow frequencies when the card input hold time
> requirement is high. This setting is not required for high speed
> MMC and might cause timing violation.
>
> Signed-off-by: Nadav Haklai <nadavh@xxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.2
Seems OK too.
Reviewed-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Thanks,
Gregory
> ---
> drivers/mmc/host/sdhci-pxav3.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index 976cddd..89a9e49 100644
> --- a/drivers/mmc/host/sdhci-pxav3.c
> +++ b/drivers/mmc/host/sdhci-pxav3.c
> @@ -291,6 +291,9 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
> uhs == MMC_TIMING_UHS_DDR50) {
> reg_val &= ~SDIO3_CONF_CLK_INV;
> reg_val |= SDIO3_CONF_SD_FB_CLK;
> + } else if (uhs == MMC_TIMING_MMC_HS) {
> + reg_val &= ~SDIO3_CONF_CLK_INV;
> + reg_val &= ~SDIO3_CONF_SD_FB_CLK;
> } else {
> reg_val |= SDIO3_CONF_CLK_INV;
> reg_val &= ~SDIO3_CONF_SD_FB_CLK;
> --
> 1.8.3.1
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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