If the OS does not support recovering the state left by the
bootloader it needs a way to reset display hardware, so that it can
start from a clean state. Add a reference to the relevant reset.

It fixes display init issue appeared in Linux v6.17: without reset
device boots into black screen and you need to turn display off/on
to "fix" it. Also sometimes it can boot into solid blue color
with these messages in kernel log:

  hw recovery is not complete for ctl:2
  [drm:dpu_encoder_phys_vid_prepare_for_kickoff:569] [dpu error]enc33
      intf1 ctl 2 reset failure: -22
  [drm:dpu_encoder_frame_done_timeout:2727] [dpu error]enc33 frame
      done timeout

Fixes: 0e789b491ba0 ("pmdomain: core: Leave powered-on genpds on until sync_state")
Cc: <stable@vger.kernel.org> # 6.17
Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
---
 arch/arm64/boot/dts/qcom/sdm630.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm630.dtsi b/arch/arm64/boot/dts/qcom/sdm630.dtsi
index 8b1a45a4e56e..fedff18a5721 100644
--- a/arch/arm64/boot/dts/qcom/sdm630.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm630.dtsi
@@ -1563,6 +1563,7 @@ mdss: display-subsystem@c900000 {
 			reg-names = "mdss_phys", "vbif_phys";
 
 			power-domains = <&mmcc MDSS_GDSC>;
+			resets = <&mmcc MDSS_BCR>;
 
 			clocks = <&mmcc MDSS_AHB_CLK>,
 				 <&mmcc MDSS_AXI_CLK>,

-- 
2.51.0

On Sun, Nov 16, 2025 at 04:12:35AM +0300, Alexey Minnekhanov wrote:
> If the OS does not support recovering the state left by the
> bootloader it needs a way to reset display hardware, so that it can
> start from a clean state. Add a reference to the relevant reset.
> 
> It fixes display init issue appeared in Linux v6.17: without reset
> device boots into black screen and you need to turn display off/on
> to "fix" it. Also sometimes it can boot into solid blue color
> with these messages in kernel log:
> 
>   hw recovery is not complete for ctl:2
>   [drm:dpu_encoder_phys_vid_prepare_for_kickoff:569] [dpu error]enc33
>       intf1 ctl 2 reset failure: -22
>   [drm:dpu_encoder_frame_done_timeout:2727] [dpu error]enc33 frame
>       done timeout
> 
> Fixes: 0e789b491ba0 ("pmdomain: core: Leave powered-on genpds on until sync_state")
> Cc: <stable@vger.kernel.org> # 6.17
> Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm630.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry