From: Mark Yacoub <markyac...@google.com>
[Why]
The user space can allocate a LUT of any size. We must validate that it
is the expected MTK_LUT_SIZE.
[How]
Bring the .atomic_check function internal to mediatek driver and check
that the new CRTC state LUT size is equal to MTK_LUT_SIZE.
Fixes igt@kms_color@pipe-A-invalid-gamma-lut-sizes
Tested on Jacuzzi (MTK)
Signed-off-by: Mark Yacoub <markyac...@chromium.org>
---
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 40 +++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index f47801737b88f..82de83656d159 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -54,9 +54,47 @@ mtk_drm_mode_fb_create(struct drm_device *dev,
return drm_gem_fb_create(dev, file, cmd);
}
+static bool is_lut_size_expected(const struct drm_device *dev,
+ const struct drm_property_blob *lut)
+{
+ int len;
+
+ if (!lut)
+ return true;
+
+ len = drm_color_lut_size(lut);
+ if (len != MTK_LUT_SIZE) {
+ drm_dbg_state(dev, "Invalid LUT size; got %d, expected %d\n",
+ len, MTK_LUT_SIZE);
+ return false;
+ }
+
+ return true;
+}
+
+static int mtk_drm_atomic_check(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *new_crtc_state;
+ int ret, i;
+
+ ret = drm_atomic_helper_check(dev, state);
+ if (ret)
+ return ret;
+
+ for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
+ if (!is_lut_size_expected(dev, new_crtc_state->degamma_lut) ||
+ !is_lut_size_expected(dev, new_crtc_state->gamma_lut))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static const struct drm_mode_config_funcs mtk_drm_mode_config_funcs = {
.fb_create = mtk_drm_mode_fb_create,
- .atomic_check = drm_atomic_helper_check,
+ .atomic_check = mtk_drm_atomic_check,
.atomic_commit = drm_atomic_helper_commit,
};
--
2.34.1.400.ga245620fadb-goog
