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drm/atmel-hlcdc: don't reject the commit if the src rect has fractional parts

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Don’t reject the commit when the source rectangle has fractional parts.
This can occur due to scaling: drm_atomic_helper_check_plane_state() calls
drm_rect_clip_scaled(), which may introduce fractional parts while
computing the clipped source rectangle. This does not imply the commit is
invalid, so we should accept it instead of discarding it.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Link: https://patch.msgid.link/20251120-lcd_scaling_fix-v1-1-5ffc98557923@microchip.com
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
This commit is contained in:
Ludovic Desroches 2025-11-20 11:38:25 +01:00 committed by Manikandan Muralidharan
parent bc84778723
commit 06682206e2
1 changed files with 4 additions and 15 deletions
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19
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
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@ -79,8 +79,6 @@ drm_plane_state_to_atmel_hlcdc_plane_state(struct drm_plane_state *s)
return container_of(s, struct atmel_hlcdc_plane_state, base);
}
#define SUBPIXEL_MASK 0xffff
static uint32_t rgb_formats[] = {
DRM_FORMAT_C8,
DRM_FORMAT_XRGB4444,
@ -745,24 +743,15 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
if (ret || !s->visible)
return ret;
hstate->src_x = s->src.x1;
hstate->src_y = s->src.y1;
hstate->src_w = drm_rect_width(&s->src);
hstate->src_h = drm_rect_height(&s->src);
hstate->src_x = s->src.x1 >> 16;
hstate->src_y = s->src.y1 >> 16;
hstate->src_w = drm_rect_width(&s->src) >> 16;
hstate->src_h = drm_rect_height(&s->src) >> 16;
hstate->crtc_x = s->dst.x1;
hstate->crtc_y = s->dst.y1;
hstate->crtc_w = drm_rect_width(&s->dst);
hstate->crtc_h = drm_rect_height(&s->dst);
if ((hstate->src_x | hstate->src_y | hstate->src_w | hstate->src_h) &
SUBPIXEL_MASK)
return -EINVAL;
hstate->src_x >>= 16;
hstate->src_y >>= 16;
hstate->src_w >>= 16;
hstate->src_h >>= 16;
hstate->nplanes = fb->format->num_planes;
if (hstate->nplanes > ATMEL_HLCDC_LAYER_MAX_PLANES)
return -EINVAL;