diff mbox

[v3,1/3] mmc: core: switch to 1V8 or 1V2 for hs400es mode

Message ID 1475216340-15344-1-git-send-email-shawn.lin@rock-chips.com (mailing list archive)
State New, archived
Headers show

Commit Message

Shawn Lin Sept. 30, 2016, 6:18 a.m. UTC
When introducing hs400es, I didn't notice that we haven't
switched voltage to 1V2 or 1V8 for it. That happens to work
as the first controller claiming to support hs400es, arasan(5.1),
which is designed to only support 1V8. So the voltage is fixed to 1V8.
But it actually is wrong, and will not fit for other host controllers.
Let's fix it.

Fixes: commit 81ac2af65793ecf ("mmc: core: implement enhanced strobe support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

Reviewed-by: Douglas Anderson <dianders@chromium.org>
---

Changes in v3:
- add Doug's tag

Changes in v2:
- fix copy-paste error, mea culpa

 drivers/mmc/core/mmc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Comments

Ulf Hansson Oct. 10, 2016, 12:38 p.m. UTC | #1
On 30 September 2016 at 08:18, Shawn Lin <shawn.lin@rock-chips.com> wrote:
> When introducing hs400es, I didn't notice that we haven't
> switched voltage to 1V2 or 1V8 for it. That happens to work
> as the first controller claiming to support hs400es, arasan(5.1),
> which is designed to only support 1V8. So the voltage is fixed to 1V8.
> But it actually is wrong, and will not fit for other host controllers.
> Let's fix it.
>
> Fixes: commit 81ac2af65793ecf ("mmc: core: implement enhanced strobe support")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>

Thanks, applied for fixes!

Kind regards
Uffe

> ---
>
> Changes in v3:
> - add Doug's tag
>
> Changes in v2:
> - fix copy-paste error, mea culpa
>
>  drivers/mmc/core/mmc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 3486bc7..f4ed5ac 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1263,6 +1263,16 @@ static int mmc_select_hs400es(struct mmc_card *card)
>                 goto out_err;
>         }
>
> +       if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
> +               err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
> +
> +       if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
> +               err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
> +
> +       /* If fails try again during next card power cycle */
> +       if (err)
> +               goto out_err;
> +
>         err = mmc_select_bus_width(card);
>         if (err < 0)
>                 goto out_err;
> --
> 2.3.7
>
>
> --
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diff mbox

Patch

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 3486bc7..f4ed5ac 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1263,6 +1263,16 @@  static int mmc_select_hs400es(struct mmc_card *card)
 		goto out_err;
 	}
 
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
+
+	if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
+
+	/* If fails try again during next card power cycle */
+	if (err)
+		goto out_err;
+
 	err = mmc_select_bus_width(card);
 	if (err < 0)
 		goto out_err;