[U-Boot] [PATCH] ARM: dts: logicpd-torpedo-37xx-devkit-u-boot: Fix MMC Card Detect

[U-Boot] [PATCH] ARM: dts: logicpd-torpedo-37xx-devkit-u-boot: Fix MMC Card Detect

[Adam Ford]

When re-syncing the DTS files from the kernel, something caused
the MMC driver to no longer detect the MMC card. Undoing the
CD-invert appears to fix the issue.

Fixes: e6ea2390cde3 ("ARM: DTS: Resync LogicPD-Torpedo-37xx-devkit
with Linux 4.18-RC4")

Signed-off-by: Adam Ford <aford173@gmail.com>

diff --git a/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi b/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi
index 4028fe7642..d584b4a9ab 100644
--- a/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi
+++ b/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi
@@ -20,10 +20,6 @@
 	clock-frequency = <400000>;
 };
 
-&mmc1 {
-	cd-inverted;
-};
-
 &mmc2 {
       status = "disabled";
 };
-- 
2.17.1

[U-Boot] [PATCH] ARM: dts: logicpd-torpedo-37xx-devkit-u-boot: Fix MMC Card Detect

[Tuomas Tynkkynen]

Hi Adam,

On 09/03/2018 05:08 PM, Adam Ford wrote:
> When re-syncing the DTS files from the kernel, something caused
> the MMC driver to no longer detect the MMC card. Undoing the
> CD-invert appears to fix the issue.
> 
> Fixes: e6ea2390cde3 ("ARM: DTS: Resync LogicPD-Torpedo-37xx-devkit
> with Linux 4.18-RC4")
> 

Looking at that commit, we see:

-       cd-gpios = <&gpio4 31 IRQ_TYPE_LEVEL_LOW>;              /* gpio127 */
+       cd-gpios = <&gpio4 31 GPIO_ACTIVE_LOW>;         /* gpio127 */


IRQ_TYPE_LEVEL_LOW is defined as 8, which in this context should get
interpreted as GPIO_TRANSITORY which is ignored by U-Boot. Thus the
card-detect polarity got toggled by that commit.

If ACTIVE_LOW is indeed the correct polarity (and I'm guessing it
is because otherwise MMC wouldn't work in Linux), this patch sounds
correct.

- Tuomas

[U-Boot] [PATCH] ARM: dts: logicpd-torpedo-37xx-devkit-u-boot: Fix MMC Card Detect

[Adam Ford]

On Wed, Sep 5, 2018 at 8:08 AM Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> wrote:
>
> Hi Adam,
>
> On 09/03/2018 05:08 PM, Adam Ford wrote:
> > When re-syncing the DTS files from the kernel, something caused
> > the MMC driver to no longer detect the MMC card. Undoing the
> > CD-invert appears to fix the issue.
> >
> > Fixes: e6ea2390cde3 ("ARM: DTS: Resync LogicPD-Torpedo-37xx-devkit
> > with Linux 4.18-RC4")
> >
>
> Looking at that commit, we see:
>
> -       cd-gpios = <&gpio4 31 IRQ_TYPE_LEVEL_LOW>;              /* gpio127 */
> +       cd-gpios = <&gpio4 31 GPIO_ACTIVE_LOW>;         /* gpio127 */
>
>
> IRQ_TYPE_LEVEL_LOW is defined as 8, which in this context should get
> interpreted as GPIO_TRANSITORY which is ignored by U-Boot. Thus the
> card-detect polarity got toggled by that commit.
>
> If ACTIVE_LOW is indeed the correct polarity (and I'm guessing it
> is because otherwise MMC wouldn't work in Linux), this patch sounds
> correct.

That makes a lot of sense.  Thanks for that.

adam
>
> - Tuomas

[U-Boot] ARM: dts: logicpd-torpedo-37xx-devkit-u-boot: Fix MMC Card Detect

[Tom Rini]

On Mon, Sep 03, 2018 at 09:08:04AM -0500, Adam Ford wrote:

> When re-syncing the DTS files from the kernel, something caused
> the MMC driver to no longer detect the MMC card. Undoing the
> CD-invert appears to fix the issue.
> 
> Fixes: e6ea2390cde3 ("ARM: DTS: Resync LogicPD-Torpedo-37xx-devkit
> with Linux 4.18-RC4")
> 
> Signed-off-by: Adam Ford <aford173@gmail.com>
> 
> diff --git a/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi b/arch/arm/dts/logicpd-torpedo-37xx-devkit-u-boot.dtsi
> index 4028fe7642..d584b4a9ab 100644

Applied to u-boot/master, thanks!

-- 
Tom
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