[1/3] drm/vc4: Expose gamma as atomic property

Commit Message

Stefan Schake March 16, 2018, 9:50 p.m. UTC

We are an atomic driver so the gamma LUT should also be exposed as a
CRTC property through the DRM atomic color management. This will also
take care of the legacy path for us.

Signed-off-by: Stefan Schake <[e-mail]>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

Comments

kernel test robot March 18, 2018, 6:58 a.m. UTC | #1

Hi Stefan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v4.16-rc4]
[also build test ERROR on next-20180316]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Stefan-Schake/drm-vc4-Atomic-color-management-support/20180318-120701
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/vc4/vc4_crtc.c: In function 'vc4_crtc_update_gamma_lut':
>> drivers/gpu/drm/vc4/vc4_crtc.c:305:30: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
     struct drm_color_lut *lut = crtc->state->gamma_lut->data;
                                 ^~~~
   cc1: some warnings being treated as errors

vim +305 drivers/gpu/drm/vc4/vc4_crtc.c

   300	
   301	static void
   302	vc4_crtc_update_gamma_lut(struct drm_crtc *crtc)
   303	{
   304		struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
 > 305		struct drm_color_lut *lut = crtc->state->gamma_lut->data;
   306		u32 length = crtc->state->gamma_lut->length / sizeof(*lut);
   307		u32 i;
   308	
   309		for (i = 0; i < length; i++) {
   310			vc4_crtc->lut_r[i] = drm_color_lut_extract(lut[i].red, 8);
   311			vc4_crtc->lut_g[i] = drm_color_lut_extract(lut[i].green, 8);
   312			vc4_crtc->lut_b[i] = drm_color_lut_extract(lut[i].blue, 8);
   313		}
   314	
   315		vc4_crtc_lut_load(crtc);
   316	}
   317	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Patch

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index bf46674..8d71098 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -298,23 +298,21 @@  vc4_crtc_lut_load(struct drm_crtc *crtc)
 		HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
 }
 
-static int
-vc4_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
-		   uint32_t size,
-		   struct drm_modeset_acquire_ctx *ctx)
+static void
+vc4_crtc_update_gamma_lut(struct drm_crtc *crtc)
 {
 	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	struct drm_color_lut *lut = crtc->state->gamma_lut->data;
+	u32 length = crtc->state->gamma_lut->length / sizeof(*lut);
 	u32 i;
 
-	for (i = 0; i < size; i++) {
-		vc4_crtc->lut_r[i] = r[i] >> 8;
-		vc4_crtc->lut_g[i] = g[i] >> 8;
-		vc4_crtc->lut_b[i] = b[i] >> 8;
+	for (i = 0; i < length; i++) {
+		vc4_crtc->lut_r[i] = drm_color_lut_extract(lut[i].red, 8);
+		vc4_crtc->lut_g[i] = drm_color_lut_extract(lut[i].green, 8);
+		vc4_crtc->lut_b[i] = drm_color_lut_extract(lut[i].blue, 8);
 	}
 
 	vc4_crtc_lut_load(crtc);
-
-	return 0;
 }
 
 static u32 vc4_get_fifo_full_level(u32 format)
@@ -699,6 +697,9 @@  static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
 	if (crtc->state->active && old_state->active)
 		vc4_crtc_update_dlist(crtc);
 
+	if (crtc->state->color_mgmt_changed && crtc->state->gamma_lut)
+		vc4_crtc_update_gamma_lut(crtc);
+
 	if (debug_dump_regs) {
 		DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
 		vc4_hvs_dump_state(dev);
@@ -909,7 +910,7 @@  static const struct drm_crtc_funcs vc4_crtc_funcs = {
 	.reset = vc4_crtc_reset,
 	.atomic_duplicate_state = vc4_crtc_duplicate_state,
 	.atomic_destroy_state = vc4_crtc_destroy_state,
-	.gamma_set = vc4_crtc_gamma_set,
+	.gamma_set = drm_atomic_helper_legacy_gamma_set,
 	.enable_vblank = vc4_enable_vblank,
 	.disable_vblank = vc4_disable_vblank,
 };
@@ -1035,6 +1036,7 @@  static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	primary_plane->crtc = crtc;
 	vc4_crtc->channel = vc4_crtc->data->hvs_channel;
 	drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
+	drm_crtc_enable_color_mgmt(crtc, 0, false, crtc->gamma_size);
 
 	/* Set up some arbitrary number of planes.  We're not limited
 	 * by a set number of physical registers, just the space in