[PATCH v2 18/18] drm/i915: Make sure fb offset is (macro)pixel aligned

ville.syrjala
2016-01-20T19:08:00Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

We convert the fb->offsets[] into x/y offsets, so they must be
(macro)pixel aligned. Check for this, and if things look good
allow fb->offsets[] != 0 when creating fbs since we now handle
them correctly.

v2: Move to last place in the series and improve the commit message

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v1)
---
drivers/gpu/drm/i915/intel_display.c | 37 +++++++++++++++++++++++++++++++++---
1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2e6cbf65b265..0538846ad20d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14909,6 +14909,37 @@ u32 intel_fb_pitch_limit(struct drm_device *dev, uint64_t fb_modifier,
}
}

+static int intel_fb_check_offsets(const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+ uint32_t format = mode_cmd->pixel_format;
+ int num_planes = drm_format_num_planes(format);
+ int i;
+
+ for (i = 0; i < num_planes; i++) {
+ unsigned int cpp;
+
+ switch (format) {
+ case DRM_FORMAT_YUYV:
+ case DRM_FORMAT_UYVY:
+ case DRM_FORMAT_YVYU:
+ case DRM_FORMAT_VYUY:
+ cpp = 4;
+ break;
+ default:
+ cpp = drm_format_plane_cpp(format, i);
+ break;
+ }
+
+ if (mode_cmd->offsets[i] % cpp) {
+ DRM_DEBUG("fb plane %d offset 0x%08x not (macro)pixel aligned\n",
+ i, mode_cmd->offsets[i]);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int intel_framebuffer_init(struct drm_device *dev,
struct intel_framebuffer *intel_fb,
struct drm_mode_fb_cmd2 *mode_cmd,
@@ -15035,9 +15066,9 @@ static int intel_framebuffer_init(struct drm_device *dev,
return -EINVAL;
}

- /* FIXME need to adjust LINOFF/TILEOFF accordingly. */
- if (mode_cmd->offsets[0] != 0)
- return -EINVAL;
+ ret = intel_fb_check_offsets(mode_cmd);
+ if (ret)
+ return ret;

drm_helper_mode_fill_fb_struct(&intel_fb->base, mode_cmd);
intel_fb->obj = obj;
--
2.4.10