On 08/06/2016 02:55 PM, Stefan Wahren wrote:
> This patch based on the work of Fabio Estevam:
> "[PATCH v2] mmc: core: Do not set mmc voltage to 1.8V when
> 'no-1-8-v' is present"
>
> It adds the support for 3.3V only DDR MMC hosts.
Do such cards even exist ? Do you have a link where I can find some ?
> Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
> ---
> drivers/mmc/core/host.c | 2 ++
> drivers/mmc/core/mmc.c | 6 ++++++
> include/linux/mmc/host.h | 1 +
> 3 files changed, 9 insertions(+)
>
> Changes to Fabio's patch:
> - rebase to current linux-next
> - rename DT property to mmc-ddr-3_3v
> - use EXT_CSD_CARD_TYPE_DDR_52 instead of new define
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index 98f25ff..4c971de 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -301,6 +301,8 @@ int mmc_of_parse(struct mmc_host *host)
> if (of_property_read_bool(np, "wakeup-source") ||
> of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
> host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
> + if (of_property_read_bool(np, "mmc-ddr-3_3v"))
> + host->caps2 |= MMC_CAP2_3_3V_ONLY_DDR;
> if (of_property_read_bool(np, "mmc-ddr-1_8v"))
> host->caps |= MMC_CAP_1_8V_DDR;
> if (of_property_read_bool(np, "mmc-ddr-1_2v"))
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index f2d185c..8a933d5 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -210,6 +210,12 @@ static void mmc_select_card_type(struct mmc_card *card)
> avail_type |= EXT_CSD_CARD_TYPE_HS_52;
> }
>
> + if (caps2 & MMC_CAP2_3_3V_ONLY_DDR &&
> + card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
> + hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
> + avail_type |= EXT_CSD_CARD_TYPE_DDR_52;
> + }
> +
> if (caps & MMC_CAP_1_8V_DDR &&
> card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
> hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index aa4bfbf..db0775d 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -311,6 +311,7 @@ struct mmc_host {
> #define MMC_CAP2_HS400_ES (1 << 20) /* Host supports enhanced strobe */
> #define MMC_CAP2_NO_SD (1 << 21) /* Do not send SD commands during initialization */
> #define MMC_CAP2_NO_MMC (1 << 22) /* Do not send (e)MMC commands during initialization */
> +#define MMC_CAP2_3_3V_ONLY_DDR (1 << 23) /* Only supports 3.3V DDR */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
>
>
--
Best regards,
Marek Vasut
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