To make sure the display subsystem starts in a predictable state, we
need to reset it. Otherwise, unpredictable issues can happen, e.g.
on the motorola-guamp smartphone DSI would not transmit anything.

Wire up the reset to fix.

Fixes: 705e50427d81 ("arm64: dts: qcom: sm6115: Add mdss/dpu node")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Val Packett <val@packett.cool>
---
 arch/arm64/boot/dts/qcom/sm6115.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
index e9336adbc391..3a9a1ad8d581 100644
--- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
@@ -1864,6 +1864,8 @@ mdss: display-subsystem@5e00000 {
 				 <&gcc GCC_DISP_HF_AXI_CLK>,
 				 <&dispcc DISP_CC_MDSS_MDP_CLK>;
 
+			resets = <&dispcc DISP_CC_MDSS_CORE_BCR>;
+
 			interrupts = <GIC_SPI 186 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-controller;
 			#interrupt-cells = <1>;
-- 
2.52.0

On 03/03/2026 04:41, Val Packett wrote:
> To make sure the display subsystem starts in a predictable state, we
> need to reset it. Otherwise, unpredictable issues can happen, e.g.
> on the motorola-guamp smartphone DSI would not transmit anything.
> 
> Wire up the reset to fix.
> 
> Fixes: 705e50427d81 ("arm64: dts: qcom: sm6115: Add mdss/dpu node")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> Signed-off-by: Val Packett <val@packett.cool>
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof