[PATCH] drm/msm/disp/dpu: consider SSPP line width during mode valid

[Vishnu Saini]

Few targets have lesser SSPP line width compared to mixer width,
SSPP line width also needs to be considered during mode valid
to avoid failures during atomic_check.

Signed-off-by: Vishnu Saini <vishnu.saini@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 6bf7c46379ae..af245c44959d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1591,6 +1591,7 @@ static enum drm_mode_status dpu_crtc_mode_valid(struct drm_crtc *crtc,
 {
 	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
 	u64 adjusted_mode_clk;
+	u32 max_width;
 
 	/* if there is no 3d_mux block we cannot merge LMs so we cannot
 	 * split the large layer into 2 LMs, filter out such modes
@@ -1613,11 +1614,14 @@ static enum drm_mode_status dpu_crtc_mode_valid(struct drm_crtc *crtc,
 		return MODE_CLOCK_HIGH;
 
 	/*
-	 * max crtc width is equal to the max mixer width * 2 and max height is 4K
+	 * max crtc width is equal to the min of max mixer width * 2 and max sspp line width * 2
+	 * max height is 4K
 	 */
-	return drm_mode_validate_size(mode,
-				      2 * dpu_kms->catalog->caps->max_mixer_width,
-				      4096);
+	max_width = 2 * min_t(u32,
+			      dpu_kms->catalog->caps->max_mixer_width,
+			      dpu_kms->catalog->caps->max_linewidth);
+
+	return drm_mode_validate_size(mode, max_width, 4096);
 }
 
 /**

---
base-commit: 6efced27f5df9d7a57e4847fe2898cdd19f72311
change-id: 20260328-msm-next-70eb896ff64d

Best regards,
-- 
Vishnu Saini <vishnu.saini@xxxxxxxxxxxxxxxx>