| Message ID | 20240605-rb12-i2c2g-pio-v2-1-946f5d6b6948@linaro.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | arm64: dts: qcom: switch RB1 and RB2 platforms to i2c2-gpio | expand |
On 05/06/2024 10:55, Dmitry Baryshkov wrote: > On the Qualcomm RB1 platform the I2C bus connected to the LT9611UXC > bridge under some circumstances can go into a state when all transfers > timeout. This causes both issues with fetching of EDID and with > updating of the bridge's firmware. While we are debugging the issue, > switch corresponding I2C bus to use i2c-gpio driver. While using > i2c-gpio no communication issues are observed. > > This patch is asusmed to be a temporary fix, so it is implemented in a > non-intrusive manner to simply reverting it later. > > Fixes: 616eda24edd4 ("arm64: dts: qcom: qrb2210-rb1: Set up HDMI") > Cc: stable@vger.kernel.org > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org> > --- > arch/arm64/boot/dts/qcom/qrb2210-rb1.dts | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts > index bb5191422660..8c27d52139a1 100644 > --- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts > +++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts > @@ -59,6 +59,17 @@ hdmi_con: endpoint { > }; > }; > > + i2c2_gpio: i2c { > + compatible = "i2c-gpio"; > + > + sda-gpios = <&tlmm 6 GPIO_ACTIVE_HIGH>; > + scl-gpios = <&tlmm 7 GPIO_ACTIVE_HIGH>; > + #address-cells = <1>; > + #size-cells = <0>; > + > + status = "disabled"; > + }; > + > leds { > compatible = "gpio-leds"; > > @@ -199,7 +210,7 @@ &gpi_dma0 { > status = "okay"; > }; > > -&i2c2 { > +&i2c2_gpio { > clock-frequency = <400000>; > status = "okay"; > >
diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts index bb5191422660..8c27d52139a1 100644 --- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts +++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts @@ -59,6 +59,17 @@ hdmi_con: endpoint { }; }; + i2c2_gpio: i2c { + compatible = "i2c-gpio"; + + sda-gpios = <&tlmm 6 GPIO_ACTIVE_HIGH>; + scl-gpios = <&tlmm 7 GPIO_ACTIVE_HIGH>; + #address-cells = <1>; + #size-cells = <0>; + + status = "disabled"; + }; + leds { compatible = "gpio-leds"; @@ -199,7 +210,7 @@ &gpi_dma0 { status = "okay"; }; -&i2c2 { +&i2c2_gpio { clock-frequency = <400000>; status = "okay";
On the Qualcomm RB1 platform the I2C bus connected to the LT9611UXC bridge under some circumstances can go into a state when all transfers timeout. This causes both issues with fetching of EDID and with updating of the bridge's firmware. While we are debugging the issue, switch corresponding I2C bus to use i2c-gpio driver. While using i2c-gpio no communication issues are observed. This patch is asusmed to be a temporary fix, so it is implemented in a non-intrusive manner to simply reverting it later. Fixes: 616eda24edd4 ("arm64: dts: qcom: qrb2210-rb1: Set up HDMI") Cc: stable@vger.kernel.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- arch/arm64/boot/dts/qcom/qrb2210-rb1.dts | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)