6.9-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
commit f77e7bd40c3c2d79685e9cc80de874b69a976f55 upstream.
On the Qualcomm RB2 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: f7b01e07e89c ("arm64: dts: qcom: qrb4210-rb2: Enable display out") Cc: stable@vger.kernel.org Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Reviewed-by: Caleb Connolly caleb.connolly@linaro.org Link: https://lore.kernel.org/r/20240605-rb12-i2c2g-pio-v2-2-946f5d6b6948@linaro.o... Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/boot/dts/qcom/qrb4210-rb2.dts | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
--- a/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts +++ b/arch/arm64/boot/dts/qcom/qrb4210-rb2.dts @@ -60,6 +60,17 @@ }; };
+ 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";
@@ -190,7 +201,7 @@ }; };
-&i2c2 { +&i2c2_gpio { clock-frequency = <400000>; status = "okay";