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* [PATCH] drm/i915/pfit: Prevent negative coordinates in center mode
@ 2026-03-31 18:16 Nemesa Garg
  2026-03-31 19:16 ` ✓ i915.CI.BAT: success for drm/i915/pfit: Prevent negative coordinates in center mode (rev2) Patchwork
                   ` (3 more replies)
  0 siblings, 4 replies; 10+ messages in thread
From: Nemesa Garg @ 2026-03-31 18:16 UTC (permalink / raw)
  To: intel-gfx, intel-xe; +Cc: ville.syrjala, Nemesa Garg

When the pipe_src width or height are greater than adjusted_mode hdisplay
and vdisplay, computed x and y offsets for center mode can be negative.
Writing negative values into the pch_fit registers result in a state error.
Add a check to clamp these values so that they are never negative.

v2: Compare in terms of pipe_src width and height.[Ville]

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
---
 drivers/gpu/drm/i915/display/intel_pfit.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_pfit.c b/drivers/gpu/drm/i915/display/intel_pfit.c
index 6dda496190e0..0edd29eef6ad 100644
--- a/drivers/gpu/drm/i915/display/intel_pfit.c
+++ b/drivers/gpu/drm/i915/display/intel_pfit.c
@@ -186,6 +186,7 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 	int pipe_src_w = drm_rect_width(&crtc_state->pipe_src);
@@ -200,6 +201,16 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 
 	switch (conn_state->scaling_mode) {
 	case DRM_MODE_SCALE_CENTER:
+		if (adjusted_mode->crtc_hdisplay < pipe_src_w ||
+		    adjusted_mode->crtc_vdisplay < pipe_src_h) {
+			drm_dbg_kms(display->drm,
+				    "[CRTC:%d:%s] pfit center mode source (%dx%d) exceeds display (%dx%d)\n",
+				    crtc->base.base.id, crtc->base.name,
+				    width, height,
+				    adjusted_mode->crtc_hdisplay,
+				    adjusted_mode->crtc_vdisplay);
+			return -EINVAL;
+		}
 		width = pipe_src_w;
 		height = pipe_src_h;
 		x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
* [PATCH] drm/i915/pfit: Prevent negative coordinates in center mode
@ 2026-04-02  6:13 Nemesa Garg
  2026-04-07 15:39 ` Ville Syrjälä
  0 siblings, 1 reply; 10+ messages in thread
From: Nemesa Garg @ 2026-04-02  6:13 UTC (permalink / raw)
  To: intel-gfx, intel-xe; +Cc: ville.syrjala, Nemesa Garg

When the pipe_src width or height are greater than adjusted_mode hdisplay
and vdisplay, computed x and y offsets for center mode can be negative.
Writing negative values into the pch_fit registers result in a state error.
Add a check to clamp these values so that they are never negative.

v2: Compare in terms of pipe_src width and height.[Ville]
v3: Change width/height to pipe_src_w/h in logging. [Ville]

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
---
 drivers/gpu/drm/i915/display/intel_pfit.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_pfit.c b/drivers/gpu/drm/i915/display/intel_pfit.c
index 6dda496190e0..2dec4ccf74ce 100644
--- a/drivers/gpu/drm/i915/display/intel_pfit.c
+++ b/drivers/gpu/drm/i915/display/intel_pfit.c
@@ -186,6 +186,7 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 	int pipe_src_w = drm_rect_width(&crtc_state->pipe_src);
@@ -200,6 +201,16 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 
 	switch (conn_state->scaling_mode) {
 	case DRM_MODE_SCALE_CENTER:
+		if (adjusted_mode->crtc_hdisplay < pipe_src_w ||
+		    adjusted_mode->crtc_vdisplay < pipe_src_h) {
+			drm_dbg_kms(display->drm,
+				    "[CRTC:%d:%s] pfit center mode source (%dx%d) exceeds display (%dx%d)\n",
+				    crtc->base.base.id, crtc->base.name,
+				    pipe_src_w, pipe_src_h,
+				    adjusted_mode->crtc_hdisplay,
+				    adjusted_mode->crtc_vdisplay);
+			return -EINVAL;
+		}
 		width = pipe_src_w;
 		height = pipe_src_h;
 		x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
* [PATCH] drm/i915/pfit: Prevent negative coordinates in center mode
@ 2026-03-31 17:40 Nemesa Garg
  2026-03-31 18:01 ` Ville Syrjälä
  0 siblings, 1 reply; 10+ messages in thread
From: Nemesa Garg @ 2026-03-31 17:40 UTC (permalink / raw)
  To: intel-gfx, intel-xe; +Cc: ville.syrjala, Nemesa Garg

When the pipe_src width or height are greater than adjusted_mode hdisplay
and vdisplay, computed x and y offsets for center mode can be negative.
Writing negative values into the pch_fit registers result in a state error.
Add a check to clamp these values so that they are never negative.

Signed-off-by: Nemesa Garg <nemesa.garg@intel.com>
---
 drivers/gpu/drm/i915/display/intel_pfit.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_pfit.c b/drivers/gpu/drm/i915/display/intel_pfit.c
index 6dda496190e0..1507c2b5b5c7 100644
--- a/drivers/gpu/drm/i915/display/intel_pfit.c
+++ b/drivers/gpu/drm/i915/display/intel_pfit.c
@@ -186,6 +186,7 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 	int pipe_src_w = drm_rect_width(&crtc_state->pipe_src);
@@ -204,6 +205,16 @@ static int pch_panel_fitting(struct intel_crtc_state *crtc_state,
 		height = pipe_src_h;
 		x = (adjusted_mode->crtc_hdisplay - width + 1)/2;
 		y = (adjusted_mode->crtc_vdisplay - height + 1)/2;
+		if (adjusted_mode->crtc_hdisplay < width ||
+		    adjusted_mode->crtc_vdisplay < height) {
+			drm_dbg_kms(display->drm,
+				    "[CRTC:%d:%s] pfit center mode source (%dx%d) exceeds display (%dx%d)\n",
+				    crtc->base.base.id, crtc->base.name,
+				    width, height,
+				    adjusted_mode->crtc_hdisplay,
+				    adjusted_mode->crtc_vdisplay);
+			return -EINVAL;
+		}
 		break;
 
 	case DRM_MODE_SCALE_ASPECT:
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2026-04-07 15:39 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-31 18:16 [PATCH] drm/i915/pfit: Prevent negative coordinates in center mode Nemesa Garg
2026-03-31 19:16 ` ✓ i915.CI.BAT: success for drm/i915/pfit: Prevent negative coordinates in center mode (rev2) Patchwork
2026-04-01 10:11 ` ✗ i915.CI.Full: failure " Patchwork
2026-04-01 20:40 ` [PATCH] drm/i915/pfit: Prevent negative coordinates in center mode Ville Syrjälä
2026-04-07  3:49 ` kernel test robot
  -- strict thread matches above, loose matches on Subject: below --
2026-04-02  6:13 Nemesa Garg
2026-04-07 15:39 ` Ville Syrjälä
2026-03-31 17:40 Nemesa Garg
2026-03-31 18:01 ` Ville Syrjälä
2026-03-31 18:24   ` Garg, Nemesa

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