[PATCH v4 00/10] drm/display: hdmi: add drm_hdmi_connector_mode_valid()

[PATCH v4 00/10] drm/display: hdmi: add drm_hdmi_connector_mode_valid()

[Dmitry Baryshkov]

Several HDMI drivers have common code pice in the .mode_valid function
that validates RGB / 8bpc rate using the TMDS char rate callbacks.

Move this code piece to the common helper and remove the need to perform
this check manually. In case of DRM_BRIDGE_OP_HDMI bridges, they can
skip the check in favour of performing it in drm_bridge_connector.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
Changes in v4:
- Fixed build warning in VC4 driver by adding .mode_valid to
  vc4_hdmi_connector_helper_funcs (LKP)
- Reworked HDMI test helpers (Maxime)
- Expanded test descriptions and comments (Maxime)
- Added new EDID to test info.max_tmds_clock filtering (Maxime)
- Link to v3: https://lore.kernel.org/r/20241109-hdmi-mode-valid-v3-0-5348c2368076@linaro.org

Changes in v3:
- Moved drm_hdmi_connector_mode_valid() to drm_hdmi_state_helper.c
  (Maxime)
- Added commnt next to the preferred = list_first_entry() assignment
  (Maxime)
- Added comments to new tests, describing what is being tested (Maxime)
- Replaced sun4i_hdmi_connector_atomic_check() with
  drm_atomic_helper_connector_hdmi_check() (Maxime)
- Link to v2: https://lore.kernel.org/r/20241101-hdmi-mode-valid-v2-0-a6478fd20fa6@linaro.org

Changes in v2:
- Switched drm_hdmi_connector_mode_valid() to use common helper
  (ex-hdmi_clock_valid()) (Maxime)
- Added simple unit tests for drm_hdmi_connector_mode_valid().
- Link to v1: https://lore.kernel.org/r/20241018-hdmi-mode-valid-v1-0-6e49ae4801f7@linaro.org

---
Dmitry Baryshkov (10):
      drm/tests: hdmi: handle empty modes in find_preferred_mode()
      drm/tests: hdmi: rename connector creation function
      drm/tests: hdmi: return meaningful value from set_connector_edid()
      drm/display: hdmi: add generic mode_valid helper
      drm/sun4i: use drm_hdmi_connector_mode_valid()
      drm/vc4: use drm_hdmi_connector_mode_valid()
      drm/display: bridge_connector: use drm_bridge_connector_mode_valid()
      drm/bridge: lontium-lt9611: drop TMDS char rate check in mode_valid
      drm/bridge: dw-hdmi-qp: replace mode_valid with tmds_char_rate
      drm/sun4i: use drm_atomic_helper_connector_hdmi_check()

 drivers/gpu/drm/bridge/lontium-lt9611.c            |   4 +-
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c       |  12 +-
 drivers/gpu/drm/display/drm_bridge_connector.c     |  16 +-
 drivers/gpu/drm/display/drm_hdmi_state_helper.c    |  21 ++
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c             |  32 +--
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 269 +++++++++++++++++----
 drivers/gpu/drm/tests/drm_kunit_edid.h             | 102 ++++++++
 drivers/gpu/drm/vc4/vc4_hdmi.c                     |   5 +-
 include/drm/display/drm_hdmi_state_helper.h        |   4 +
 9 files changed, 371 insertions(+), 94 deletions(-)
---
base-commit: d80b5c5b9be6b2e1cdeaaeaa8259523b63cae292
change-id: 20241018-hdmi-mode-valid-aaec4428501c

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

[PATCH v4 01/10] drm/tests: hdmi: handle empty modes in find_preferred_mode()

[Dmitry Baryshkov]

If the connector->modes list is empty, then list_first_entry() returns a
bogus entry. Change that to use list_first_entry_or_null().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index 294773342e710dc56772f839c2db9c2e487bbc1e..1e77689af6549f162eb3026c7bd2bbd59516ed98 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -46,7 +46,7 @@ static struct drm_display_mode *find_preferred_mode(struct drm_connector *connec
 	struct drm_display_mode *mode, *preferred;
 
 	mutex_lock(&drm->mode_config.mutex);
-	preferred = list_first_entry(&connector->modes, struct drm_display_mode, head);
+	preferred = list_first_entry_or_null(&connector->modes, struct drm_display_mode, head);
 	list_for_each_entry(mode, &connector->modes, head)
 		if (mode->type & DRM_MODE_TYPE_PREFERRED)
 			preferred = mode;

-- 
2.39.5

Re: [PATCH v4 01/10] drm/tests: hdmi: handle empty modes in find_preferred_mode()

[Maxime Ripard]

On Fri, 22 Nov 2024 11:12:57 +0200, Dmitry Baryshkov wrote:
> If the connector->modes list is empty, then list_first_entry() returns a
> bogus entry. Change that to use list_first_entry_or_null().
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Reviewed-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

[PATCH v4 02/10] drm/tests: hdmi: rename connector creation function

[Dmitry Baryshkov]

As pointed out by Maxime, the drm_atomic_helper_connector_hdmi_init()
isn't a good name for a function inside KUnit tests. Rename it to
drm_kunit_helper_connector_hdmi_init().

Suggested-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 58 +++++++++++-----------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index 1e77689af6549f162eb3026c7bd2bbd59516ed98..d81254d46975e8af0d782249928217a1ebb7646e 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -164,7 +164,7 @@ static const struct drm_connector_funcs dummy_connector_funcs = {
 
 static
 struct drm_atomic_helper_connector_hdmi_priv *
-drm_atomic_helper_connector_hdmi_init(struct kunit *test,
+drm_kunit_helper_connector_hdmi_init(struct kunit *test,
 				      unsigned int formats,
 				      unsigned int max_bpc)
 {
@@ -247,7 +247,7 @@ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -310,7 +310,7 @@ static void drm_test_check_broadcast_rgb_crtc_mode_not_changed(struct kunit *tes
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -373,7 +373,7 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -429,7 +429,7 @@ static void drm_test_check_broadcast_rgb_auto_cea_mode_vic_1(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -485,7 +485,7 @@ static void drm_test_check_broadcast_rgb_full_cea_mode(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -543,7 +543,7 @@ static void drm_test_check_broadcast_rgb_full_cea_mode_vic_1(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -601,7 +601,7 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -659,7 +659,7 @@ static void drm_test_check_broadcast_rgb_limited_cea_mode_vic_1(struct kunit *te
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -719,7 +719,7 @@ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     10);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -793,7 +793,7 @@ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     10);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -862,7 +862,7 @@ static void drm_test_check_output_bpc_dvi(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -911,7 +911,7 @@ static void drm_test_check_tmds_char_rate_rgb_8bpc(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -958,7 +958,7 @@ static void drm_test_check_tmds_char_rate_rgb_10bpc(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     10);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1005,7 +1005,7 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     12);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1056,7 +1056,7 @@ static void drm_test_check_hdmi_funcs_reject_rate(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1112,7 +1112,7 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     12);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1179,7 +1179,7 @@ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -1242,7 +1242,7 @@ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -1305,7 +1305,7 @@ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test)
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     12);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1370,7 +1370,7 @@ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -1438,7 +1438,7 @@ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1496,7 +1496,7 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
 	struct drm_crtc *crtc;
 	int ret;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -1593,7 +1593,7 @@ static void drm_test_check_broadcast_rgb_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1615,7 +1615,7 @@ static void drm_test_check_bpc_8_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     8);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1639,7 +1639,7 @@ static void drm_test_check_bpc_10_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     10);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1663,7 +1663,7 @@ static void drm_test_check_bpc_12_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB),
 						     12);
 	KUNIT_ASSERT_NOT_NULL(test, priv);
@@ -1685,7 +1685,7 @@ static void drm_test_check_format_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),
@@ -1707,7 +1707,7 @@ static void drm_test_check_tmds_char_value(struct kunit *test)
 	struct drm_connector_state *conn_state;
 	struct drm_connector *conn;
 
-	priv = drm_atomic_helper_connector_hdmi_init(test,
+	priv = drm_kunit_helper_connector_hdmi_init(test,
 						     BIT(HDMI_COLORSPACE_RGB) |
 						     BIT(HDMI_COLORSPACE_YUV422) |
 						     BIT(HDMI_COLORSPACE_YUV444),

-- 
2.39.5

Re: [PATCH v4 02/10] drm/tests: hdmi: rename connector creation function

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1644 bytes --]

On Fri, Nov 22, 2024 at 11:12:58AM +0200, Dmitry Baryshkov wrote:
> As pointed out by Maxime, the drm_atomic_helper_connector_hdmi_init()
> isn't a good name for a function inside KUnit tests. Rename it to
> drm_kunit_helper_connector_hdmi_init().
> 
> Suggested-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 58 +++++++++++-----------
>  1 file changed, 29 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> index 1e77689af6549f162eb3026c7bd2bbd59516ed98..d81254d46975e8af0d782249928217a1ebb7646e 100644
> --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> @@ -164,7 +164,7 @@ static const struct drm_connector_funcs dummy_connector_funcs = {
>  
>  static
>  struct drm_atomic_helper_connector_hdmi_priv *
> -drm_atomic_helper_connector_hdmi_init(struct kunit *test,
> +drm_kunit_helper_connector_hdmi_init(struct kunit *test,
>  				      unsigned int formats,
>  				      unsigned int max_bpc)
>  {
> @@ -247,7 +247,7 @@ static void drm_test_check_broadcast_rgb_crtc_mode_changed(struct kunit *test)
>  	struct drm_crtc *crtc;
>  	int ret;
>  
> -	priv = drm_atomic_helper_connector_hdmi_init(test,
> +	priv = drm_kunit_helper_connector_hdmi_init(test,
>  						     BIT(HDMI_COLORSPACE_RGB),
>  						     8);

The alignment is off now. With that fixed,

Reviewed-by: Maxime Ripard <mripard@kernel.org>

Maxime

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 273 bytes --]

[PATCH v4 03/10] drm/tests: hdmi: return meaningful value from set_connector_edid()

[Dmitry Baryshkov]

The set_connector_edid() function returns a bogus 0, performing the
check on the connector->funcs->fill_modes() result internally. Make the
function pass the fill_modes()'s return value to the caller and move
corresponding checks to the caller site.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 31 +++++++++++-----------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index d81254d46975e8af0d782249928217a1ebb7646e..c963d7015d179ac36e646d4c19d986ac5997dd2c 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -105,9 +105,8 @@ static int set_connector_edid(struct kunit *test, struct drm_connector *connecto
 	mutex_lock(&drm->mode_config.mutex);
 	ret = connector->funcs->fill_modes(connector, 4096, 4096);
 	mutex_unlock(&drm->mode_config.mutex);
-	KUNIT_ASSERT_GT(test, ret, 0);
 
-	return 0;
+	return ret;
 }
 
 static const struct drm_connector_hdmi_funcs dummy_connector_hdmi_funcs = {
@@ -223,7 +222,7 @@ drm_kunit_helper_connector_hdmi_init(struct kunit *test,
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	return priv;
 }
@@ -728,7 +727,7 @@ static void drm_test_check_output_bpc_crtc_mode_changed(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
@@ -802,7 +801,7 @@ static void drm_test_check_output_bpc_crtc_mode_not_changed(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
@@ -873,7 +872,7 @@ static void drm_test_check_output_bpc_dvi(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_dvi_1080p,
 				 ARRAY_SIZE(test_edid_dvi_1080p));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_FALSE(test, info->is_hdmi);
@@ -920,7 +919,7 @@ static void drm_test_check_tmds_char_rate_rgb_8bpc(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
@@ -967,7 +966,7 @@ static void drm_test_check_tmds_char_rate_rgb_10bpc(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
@@ -1014,7 +1013,7 @@ static void drm_test_check_tmds_char_rate_rgb_12bpc(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
@@ -1121,7 +1120,7 @@ static void drm_test_check_max_tmds_rate_bpc_fallback(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1190,7 +1189,7 @@ static void drm_test_check_max_tmds_rate_format_fallback(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1254,7 +1253,7 @@ static void drm_test_check_output_bpc_format_vic_1(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1314,7 +1313,7 @@ static void drm_test_check_output_bpc_format_driver_rgb_only(struct kunit *test)
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1381,7 +1380,7 @@ static void drm_test_check_output_bpc_format_display_rgb_only(struct kunit *test
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1447,7 +1446,7 @@ static void drm_test_check_output_bpc_format_driver_8bpc_only(struct kunit *test
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_yuv_dc_max_340mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);
@@ -1507,7 +1506,7 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
 	ret = set_connector_edid(test, conn,
 				 test_edid_hdmi_1080p_rgb_max_340mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_340mhz));
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_GT(test, ret, 0);
 
 	info = &conn->display_info;
 	KUNIT_ASSERT_TRUE(test, info->is_hdmi);

-- 
2.39.5

Re: [PATCH v4 03/10] drm/tests: hdmi: return meaningful value from set_connector_edid()

[Maxime Ripard]

On Fri, 22 Nov 2024 11:12:59 +0200, Dmitry Baryshkov wrote:
> The set_connector_edid() function returns a bogus 0, performing the
> check on the connector->funcs->fill_modes() result internally. Make the
> function pass the fill_modes()'s return value to the caller and move
> corresponding checks to the caller site.
> 
> 
> [ ... ]

Reviewed-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

[PATCH v4 04/10] drm/display: hdmi: add generic mode_valid helper

[Dmitry Baryshkov]

Add drm_hdmi_connector_mode_valid(), generic helper for HDMI connectors.
It can be either used directly or as a part of the .mode_valid callback.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c    |  21 +++
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 180 ++++++++++++++++++++-
 drivers/gpu/drm/tests/drm_kunit_edid.h             | 102 ++++++++++++
 include/drm/display/drm_hdmi_state_helper.h        |   4 +
 4 files changed, 302 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index feb7a3a759811aed70c679be8704072093e2a79b..80bf2829ba89b5f84fed4fa9eb1d6302e10a4f9e 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -521,6 +521,27 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
 
+/**
+ * drm_hdmi_connector_mode_valid() - Check if mode is valid for HDMI connector
+ * @connector: DRM connector to validate the mode
+ * @mode: Display mode to validate
+ *
+ * Generic .mode_valid implementation for HDMI connectors.
+ */
+enum drm_mode_status
+drm_hdmi_connector_mode_valid(struct drm_connector *connector,
+			      struct drm_display_mode *mode)
+{
+	unsigned long long clock;
+
+	clock = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
+	if (!clock)
+		return MODE_ERROR;
+
+	return hdmi_clock_valid(connector, mode, clock);
+}
+EXPORT_SYMBOL(drm_hdmi_connector_mode_valid);
+
 static int clear_device_infoframe(struct drm_connector *connector,
 				  enum hdmi_infoframe_type type)
 {
diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index c963d7015d179ac36e646d4c19d986ac5997dd2c..519cfbf1a3d6e82effb2372aeb2772a292230b5d 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -124,6 +124,18 @@ static const struct drm_connector_hdmi_funcs reject_connector_hdmi_funcs = {
 	.tmds_char_rate_valid	= reject_connector_tmds_char_rate_valid,
 };
 
+static enum drm_mode_status
+reject_100MHz_connector_tmds_char_rate_valid(const struct drm_connector *connector,
+					     const struct drm_display_mode *mode,
+					     unsigned long long tmds_rate)
+{
+	return (tmds_rate > 100ULL * 1000 * 1000) ? MODE_BAD : MODE_OK;
+}
+
+static const struct drm_connector_hdmi_funcs reject_100_MHz_connector_hdmi_funcs = {
+	.tmds_char_rate_valid	= reject_100MHz_connector_tmds_char_rate_valid,
+};
+
 static int dummy_connector_get_modes(struct drm_connector *connector)
 {
 	struct drm_atomic_helper_connector_hdmi_priv *priv =
@@ -146,6 +158,7 @@ static int dummy_connector_get_modes(struct drm_connector *connector)
 static const struct drm_connector_helper_funcs dummy_connector_helper_funcs = {
 	.atomic_check	= drm_atomic_helper_connector_hdmi_check,
 	.get_modes	= dummy_connector_get_modes,
+	.mode_valid	= drm_hdmi_connector_mode_valid,
 };
 
 static void dummy_hdmi_connector_reset(struct drm_connector *connector)
@@ -163,9 +176,10 @@ static const struct drm_connector_funcs dummy_connector_funcs = {
 
 static
 struct drm_atomic_helper_connector_hdmi_priv *
-drm_kunit_helper_connector_hdmi_init(struct kunit *test,
-				      unsigned int formats,
-				      unsigned int max_bpc)
+drm_kunit_helper_connector_hdmi_init_funcs(struct kunit *test,
+					   unsigned int formats,
+					   unsigned int max_bpc,
+					   const struct drm_connector_hdmi_funcs *hdmi_funcs)
 {
 	struct drm_atomic_helper_connector_hdmi_priv *priv;
 	struct drm_connector *conn;
@@ -207,7 +221,7 @@ drm_kunit_helper_connector_hdmi_init(struct kunit *test,
 	ret = drmm_connector_hdmi_init(drm, conn,
 				       "Vendor", "Product",
 				       &dummy_connector_funcs,
-				       &dummy_connector_hdmi_funcs,
+				       hdmi_funcs,
 				       DRM_MODE_CONNECTOR_HDMIA,
 				       NULL,
 				       formats,
@@ -219,7 +233,24 @@ drm_kunit_helper_connector_hdmi_init(struct kunit *test,
 
 	drm_mode_config_reset(drm);
 
-	ret = set_connector_edid(test, conn,
+	return priv;
+}
+
+static
+struct drm_atomic_helper_connector_hdmi_priv *
+drm_kunit_helper_connector_hdmi_init(struct kunit *test,
+				     unsigned int formats,
+				     unsigned int max_bpc)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	int ret;
+
+	priv = drm_kunit_helper_connector_hdmi_init_funcs(test,
+							  formats, max_bpc,
+							  &dummy_connector_hdmi_funcs);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+
+	ret = set_connector_edid(test, &priv->connector,
 				 test_edid_hdmi_1080p_rgb_max_200mhz,
 				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
 	KUNIT_ASSERT_GT(test, ret, 0);
@@ -1733,9 +1764,148 @@ static struct kunit_suite drm_atomic_helper_connector_hdmi_reset_test_suite = {
 	.test_cases	= drm_atomic_helper_connector_hdmi_reset_tests,
 };
 
+/*
+ * Test that the default behaviour for drm_hdmi_connector_mode_valid() is not
+ * to reject any modes. Pass a correct EDID and verify that preferred mode
+ * matches the expectations (1080p).
+ */
+static void drm_test_check_mode_valid(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_connector *conn;
+	struct drm_display_mode *preferred;
+
+	priv = drm_kunit_helper_connector_hdmi_init(test,
+						    BIT(HDMI_COLORSPACE_RGB),
+						    8);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	conn = &priv->connector;
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+
+	KUNIT_EXPECT_EQ(test, preferred->hdisplay, 1920);
+	KUNIT_EXPECT_EQ(test, preferred->vdisplay, 1080);
+	KUNIT_EXPECT_EQ(test, preferred->clock, 148500);
+}
+
+/*
+ * Test that the drm_hdmi_connector_mode_valid() will reject modes depending on
+ * the .tmds_char_rate_valid() behaviour.
+ * Pass a correct EDID and verify that high-rate modes are filtered.
+ */
+static void drm_test_check_mode_valid_reject_rate(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_connector *conn;
+	struct drm_display_mode *preferred;
+	int ret;
+
+	priv = drm_kunit_helper_connector_hdmi_init_funcs(test,
+							  BIT(HDMI_COLORSPACE_RGB),
+							  8,
+							  &reject_100_MHz_connector_hdmi_funcs);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	conn = &priv->connector;
+
+	ret = set_connector_edid(test, conn,
+				 test_edid_hdmi_1080p_rgb_max_200mhz,
+				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	/*
+	 * Unlike the drm_test_check_mode_valid() here 1080p is rejected, but
+	 * 480p is allowed.
+	 */
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+	KUNIT_EXPECT_EQ(test, preferred->hdisplay, 640);
+	KUNIT_EXPECT_EQ(test, preferred->vdisplay, 480);
+	KUNIT_EXPECT_EQ(test, preferred->clock, 25200);
+}
+
+/*
+ * Test that the drm_hdmi_connector_mode_valid() will not mark any modes as
+ * valid if .tmds_char_rate_valid() rejects all of them. Pass a correct EDID
+ * and verify that there is no preferred mode and no modes were set for the
+ * connector.
+ */
+static void drm_test_check_mode_valid_reject(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_connector *conn;
+	struct drm_display_mode *preferred;
+	int ret;
+
+	priv = drm_kunit_helper_connector_hdmi_init_funcs(test,
+							  BIT(HDMI_COLORSPACE_RGB),
+							  8,
+							  &reject_connector_hdmi_funcs);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	conn = &priv->connector;
+
+	/* should reject all modes */
+	ret = set_connector_edid(test, conn,
+				 test_edid_hdmi_1080p_rgb_max_200mhz,
+				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NULL(test, preferred);
+}
+
+/*
+ * Test that the drm_hdmi_connector_mode_valid() will reject modes that don't
+ * pass the info.max_tmds_clock filter. Pass crafted EDID and verify that
+ * high-rate modes are filtered.
+ */
+static void drm_test_check_mode_valid_reject_max_clock(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_connector *conn;
+	struct drm_display_mode *preferred;
+	int ret;
+
+	priv = drm_kunit_helper_connector_hdmi_init(test,
+						    BIT(HDMI_COLORSPACE_RGB),
+						    8);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	conn = &priv->connector;
+
+	ret = set_connector_edid(test, conn,
+				 test_edid_hdmi_1080p_rgb_max_100mhz,
+				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_100mhz));
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	KUNIT_ASSERT_EQ(test, conn->display_info.max_tmds_clock, 100 * 1000);
+
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+	KUNIT_EXPECT_EQ(test, preferred->hdisplay, 640);
+	KUNIT_EXPECT_EQ(test, preferred->vdisplay, 480);
+	KUNIT_EXPECT_EQ(test, preferred->clock, 25200);
+}
+
+static struct kunit_case drm_atomic_helper_connector_hdmi_mode_valid_tests[] = {
+	KUNIT_CASE(drm_test_check_mode_valid),
+	KUNIT_CASE(drm_test_check_mode_valid_reject),
+	KUNIT_CASE(drm_test_check_mode_valid_reject_rate),
+	KUNIT_CASE(drm_test_check_mode_valid_reject_max_clock),
+	{ }
+};
+
+static struct kunit_suite drm_atomic_helper_connector_hdmi_mode_valid_test_suite = {
+	.name		= "drm_atomic_helper_connector_hdmi_mode_valid",
+	.test_cases	= drm_atomic_helper_connector_hdmi_mode_valid_tests,
+};
+
 kunit_test_suites(
 	&drm_atomic_helper_connector_hdmi_check_test_suite,
 	&drm_atomic_helper_connector_hdmi_reset_test_suite,
+	&drm_atomic_helper_connector_hdmi_mode_valid_test_suite,
 );
 
 MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
diff --git a/drivers/gpu/drm/tests/drm_kunit_edid.h b/drivers/gpu/drm/tests/drm_kunit_edid.h
index 107559900e977119d451b00a647f0bd6ab598f63..6358397a5d7ab0bcdea1c824fc9fd382560f4b0e 100644
--- a/drivers/gpu/drm/tests/drm_kunit_edid.h
+++ b/drivers/gpu/drm/tests/drm_kunit_edid.h
@@ -61,6 +61,108 @@ static const unsigned char test_edid_dvi_1080p[] = {
 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xab
 };
 
+/*
+ * edid-decode (hex):
+ *
+ * 00 ff ff ff ff ff ff 00 31 d8 2a 00 00 00 00 00
+ * 00 21 01 03 81 a0 5a 78 02 00 00 00 00 00 00 00
+ * 00 00 00 20 00 00 01 01 01 01 01 01 01 01 01 01
+ * 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c
+ * 45 00 40 84 63 00 00 1e 00 00 00 fc 00 54 65 73
+ * 74 20 45 44 49 44 0a 20 20 20 00 00 00 fd 00 32
+ * 46 1e 46 0f 00 0a 20 20 20 20 20 20 00 00 00 10
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 92
+ *
+ * 02 03 1b 81 e3 05 00 20 41 10 e2 00 4a 6d 03 0c
+ * 00 12 34 00 14 20 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+ * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e4
+ *
+ * ----------------
+ *
+ * Block 0, Base EDID:
+ *   EDID Structure Version & Revision: 1.3
+ *   Vendor & Product Identification:
+ *     Manufacturer: LNX
+ *     Model: 42
+ *     Made in: 2023
+ *   Basic Display Parameters & Features:
+ *     Digital display
+ *     DFP 1.x compatible TMDS
+ *     Maximum image size: 160 cm x 90 cm
+ *     Gamma: 2.20
+ *     Monochrome or grayscale display
+ *     First detailed timing is the preferred timing
+ *   Color Characteristics:
+ *     Red  : 0.0000, 0.0000
+ *     Green: 0.0000, 0.0000
+ *     Blue : 0.0000, 0.0000
+ *     White: 0.0000, 0.0000
+ *   Established Timings I & II:
+ *     DMT 0x04:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz
+ *   Standard Timings: none
+ *   Detailed Timing Descriptors:
+ *     DTD 1:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz (1600 mm x 900 mm)
+ *                  Hfront   88 Hsync  44 Hback  148 Hpol P
+ *                  Vfront    4 Vsync   5 Vback   36 Vpol P
+ *     Display Product Name: 'Test EDID'
+ *     Display Range Limits:
+ *       Monitor ranges (GTF): 50-70 Hz V, 30-70 kHz H, max dotclock 150 MHz
+ *     Dummy Descriptor:
+ *   Extension blocks: 1
+ * Checksum: 0x92
+ *
+ * ----------------
+ *
+ * Block 1, CTA-861 Extension Block:
+ *   Revision: 3
+ *   Underscans IT Video Formats by default
+ *   Native detailed modes: 1
+ *   Colorimetry Data Block:
+ *     sRGB
+ *   Video Data Block:
+ *     VIC  16:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz
+ *   Video Capability Data Block:
+ *     YCbCr quantization: No Data
+ *     RGB quantization: Selectable (via AVI Q)
+ *     PT scan behavior: No Data
+ *     IT scan behavior: Always Underscanned
+ *     CE scan behavior: Always Underscanned
+ *   Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
+ *     Source physical address: 1.2.3.4
+ *     Maximum TMDS clock: 100 MHz
+ *     Extended HDMI video details:
+ * Checksum: 0xe4  Unused space in Extension Block: 100 bytes
+ */
+static const unsigned char test_edid_hdmi_1080p_rgb_max_100mhz[] = {
+	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x31, 0xd8, 0x2a, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x01, 0x03, 0x81, 0xa0, 0x5a, 0x78,
+	0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
+	0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38,
+	0x2d, 0x40, 0x58, 0x2c, 0x45, 0x00, 0x40, 0x84, 0x63, 0x00, 0x00, 0x1e,
+	0x00, 0x00, 0x00, 0xfc, 0x00, 0x54, 0x65, 0x73, 0x74, 0x20, 0x45, 0x44,
+	0x49, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x32,
+	0x46, 0x00, 0x00, 0xc4, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+	0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x41, 0x02, 0x03, 0x1b, 0x81,
+	0xe3, 0x05, 0x00, 0x20, 0x41, 0x10, 0xe2, 0x00, 0x4a, 0x6d, 0x03, 0x0c,
+	0x00, 0x12, 0x34, 0x00, 0x14, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0xe4
+};
+
 /*
  * edid-decode (hex):
  *
diff --git a/include/drm/display/drm_hdmi_state_helper.h b/include/drm/display/drm_hdmi_state_helper.h
index 2d45fcfa461985065a5e5ad67eddc0b1c556d526..d6d65da6d8f9ee46de33114cce2d6fbe6098a862 100644
--- a/include/drm/display/drm_hdmi_state_helper.h
+++ b/include/drm/display/drm_hdmi_state_helper.h
@@ -20,4 +20,8 @@ int drm_atomic_helper_connector_hdmi_clear_audio_infoframe(struct drm_connector
 int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector,
 						       struct drm_atomic_state *state);
 
+enum drm_mode_status
+drm_hdmi_connector_mode_valid(struct drm_connector *connector,
+			      struct drm_display_mode *mode);
+
 #endif // DRM_HDMI_STATE_HELPER_H_

-- 
2.39.5

[PATCH v4 05/10] drm/sun4i: use drm_hdmi_connector_mode_valid()

[Dmitry Baryshkov]

Use new drm_hdmi_connector_mode_valid() helper instead of a
module-specific copy.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
index b3649449de3026784ae2f3466906403a0b6e3b47..54b72fe220afacc208b3fd48d5160031127ea14a 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
@@ -205,16 +205,6 @@ static int sun4i_hdmi_connector_atomic_check(struct drm_connector *connector,
 	return 0;
 }
 
-static enum drm_mode_status
-sun4i_hdmi_connector_mode_valid(struct drm_connector *connector,
-				struct drm_display_mode *mode)
-{
-	unsigned long long rate = drm_hdmi_compute_mode_clock(mode, 8,
-							      HDMI_COLORSPACE_RGB);
-
-	return sun4i_hdmi_connector_clock_valid(connector, mode, rate);
-}
-
 static int sun4i_hdmi_get_modes(struct drm_connector *connector)
 {
 	struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
@@ -269,7 +259,7 @@ static const struct drm_connector_hdmi_funcs sun4i_hdmi_hdmi_connector_funcs = {
 
 static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
 	.atomic_check	= sun4i_hdmi_connector_atomic_check,
-	.mode_valid	= sun4i_hdmi_connector_mode_valid,
+	.mode_valid	= drm_hdmi_connector_mode_valid,
 	.get_modes	= sun4i_hdmi_get_modes,
 };
 

-- 
2.39.5

[PATCH v4 06/10] drm/vc4: use drm_hdmi_connector_mode_valid()

[Dmitry Baryshkov]

Use new drm_hdmi_connector_mode_valid() helper instead of a
module-specific copy.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 62b82b1eeb3694d1685969c49b2760cbbddc840e..2fecaac0df0acd865186ee928cf26449799fc7ba 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -580,6 +580,7 @@ static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs =
 	.detect_ctx = vc4_hdmi_connector_detect_ctx,
 	.get_modes = vc4_hdmi_connector_get_modes,
 	.atomic_check = vc4_hdmi_connector_atomic_check,
+	.mode_valid = drm_hdmi_connector_mode_valid,
 };
 
 static const struct drm_connector_hdmi_funcs vc4_hdmi_hdmi_connector_funcs;
@@ -1752,7 +1753,6 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
 			    const struct drm_display_mode *mode)
 {
 	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
-	unsigned long long rate;
 
 	if (vc4_hdmi->variant->unsupported_odd_h_timings &&
 	    !(mode->flags & DRM_MODE_FLAG_DBLCLK) &&
@@ -1760,8 +1760,7 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
 	     (mode->hsync_end % 2) || (mode->htotal % 2)))
 		return MODE_H_ILLEGAL;
 
-	rate = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
-	return vc4_hdmi_connector_clock_valid(&vc4_hdmi->connector, mode, rate);
+	return MODE_OK;
 }
 
 static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {

-- 
2.39.5

[PATCH v4 07/10] drm/display: bridge_connector: use drm_bridge_connector_mode_valid()

[Dmitry Baryshkov]

Use new drm_bridge_connector_mode_valid() helper if there is a HDMI
bridge in the bridge chain. This removes the need to perform TMDS char
rate check manually in the bridge driver.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 320c297008aaa8b6ef5b1f4c71928849b202e8ac..512ced87ea18c74e182a558a686ddd83de891814 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -18,6 +18,7 @@
 #include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/display/drm_hdmi_helper.h>
 #include <drm/display/drm_hdmi_state_helper.h>
 
 /**
@@ -299,9 +300,22 @@ static int drm_bridge_connector_get_modes(struct drm_connector *connector)
 	return 0;
 }
 
+static enum drm_mode_status
+drm_bridge_connector_mode_valid(struct drm_connector *connector,
+				struct drm_display_mode *mode)
+{
+	struct drm_bridge_connector *bridge_connector =
+		to_drm_bridge_connector(connector);
+
+	if (bridge_connector->bridge_hdmi)
+		return drm_hdmi_connector_mode_valid(connector, mode);
+
+	return MODE_OK;
+}
+
 static const struct drm_connector_helper_funcs drm_bridge_connector_helper_funcs = {
 	.get_modes = drm_bridge_connector_get_modes,
-	/* No need for .mode_valid(), the bridges are checked by the core. */
+	.mode_valid = drm_bridge_connector_mode_valid,
 	.enable_hpd = drm_bridge_connector_enable_hpd,
 	.disable_hpd = drm_bridge_connector_disable_hpd,
 };

-- 
2.39.5

[PATCH v4 08/10] drm/bridge: lontium-lt9611: drop TMDS char rate check in mode_valid

[Dmitry Baryshkov]

Drop manual check of the TMDS char rate in the mode_valid callback. This
check is now being performed by the core.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 8f25b338a8d8f95dc0691735ac6343675098f7f7..1ffbe473e4103dfc315a8cd3571e9407bf518797 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -757,7 +757,6 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
 						     const struct drm_display_mode *mode)
 {
 	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
-	unsigned long long rate;
 
 	if (mode->hdisplay > 3840)
 		return MODE_BAD_HVALUE;
@@ -765,8 +764,7 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
 	if (mode->hdisplay > 2000 && !lt9611->dsi1_node)
 		return MODE_PANEL;
 
-	rate = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
-	return bridge->funcs->hdmi_tmds_char_rate_valid(bridge, mode, rate);
+	return MODE_OK;
 }
 
 static int lt9611_bridge_atomic_check(struct drm_bridge *bridge,

-- 
2.39.5

[PATCH v4 09/10] drm/bridge: dw-hdmi-qp: replace mode_valid with tmds_char_rate

[Dmitry Baryshkov]

Replace .mode_valid() callback with .hdmi_tmds_char_rate_valid(). It is
more generic and is used in other mode validation paths. The rate
validation for .mode_valid() will be performed by the
drm_bridge_connector code.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
index 181c5164b23192f0b557624d73c6223032b90ec6..c686671e4850a1af75b82995185ffc3cbb22a447 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c
@@ -442,16 +442,14 @@ dw_hdmi_qp_bridge_edid_read(struct drm_bridge *bridge,
 }
 
 static enum drm_mode_status
-dw_hdmi_qp_bridge_mode_valid(struct drm_bridge *bridge,
-			     const struct drm_display_info *info,
-			     const struct drm_display_mode *mode)
+dw_hdmi_qp_bridge_tmds_char_rate_valid(const struct drm_bridge *bridge,
+				       const struct drm_display_mode *mode,
+				       unsigned long long rate)
 {
 	struct dw_hdmi_qp *hdmi = bridge->driver_private;
-	unsigned long long rate;
 
-	rate = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB);
 	if (rate > HDMI14_MAX_TMDSCLK) {
-		dev_dbg(hdmi->dev, "Unsupported mode clock: %d\n", mode->clock);
+		dev_dbg(hdmi->dev, "Unsupported TMDS char rate: %lld\n", rate);
 		return MODE_CLOCK_HIGH;
 	}
 
@@ -510,7 +508,7 @@ static const struct drm_bridge_funcs dw_hdmi_qp_bridge_funcs = {
 	.atomic_disable = dw_hdmi_qp_bridge_atomic_disable,
 	.detect = dw_hdmi_qp_bridge_detect,
 	.edid_read = dw_hdmi_qp_bridge_edid_read,
-	.mode_valid = dw_hdmi_qp_bridge_mode_valid,
+	.hdmi_tmds_char_rate_valid = dw_hdmi_qp_bridge_tmds_char_rate_valid,
 	.hdmi_clear_infoframe = dw_hdmi_qp_bridge_clear_infoframe,
 	.hdmi_write_infoframe = dw_hdmi_qp_bridge_write_infoframe,
 };

-- 
2.39.5

[PATCH v4 10/10] drm/sun4i: use drm_atomic_helper_connector_hdmi_check()

[Dmitry Baryshkov]

Replace sun4i_hdmi_connector_atomic_check(), which performs just TMDS
char rate check, with drm_atomic_helper_connector_hdmi_check(), which
performs additional checks basing on the HDMI Connector's state.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
index 54b72fe220afacc208b3fd48d5160031127ea14a..b05fd77870b00aac97d003f3fb9c2b98cb73abc0 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
@@ -187,24 +187,6 @@ sun4i_hdmi_connector_clock_valid(const struct drm_connector *connector,
 	return MODE_NOCLOCK;
 }
 
-static int sun4i_hdmi_connector_atomic_check(struct drm_connector *connector,
-					     struct drm_atomic_state *state)
-{
-	struct drm_connector_state *conn_state =
-		drm_atomic_get_new_connector_state(state, connector);
-	struct drm_crtc *crtc = conn_state->crtc;
-	struct drm_crtc_state *crtc_state = crtc->state;
-	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
-	enum drm_mode_status status;
-
-	status = sun4i_hdmi_connector_clock_valid(connector, mode,
-						  conn_state->hdmi.tmds_char_rate);
-	if (status != MODE_OK)
-		return -EINVAL;
-
-	return 0;
-}
-
 static int sun4i_hdmi_get_modes(struct drm_connector *connector)
 {
 	struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
@@ -258,7 +240,7 @@ static const struct drm_connector_hdmi_funcs sun4i_hdmi_hdmi_connector_funcs = {
 };
 
 static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
-	.atomic_check	= sun4i_hdmi_connector_atomic_check,
+	.atomic_check	= drm_atomic_helper_connector_hdmi_check,
 	.mode_valid	= drm_hdmi_connector_mode_valid,
 	.get_modes	= sun4i_hdmi_get_modes,
 };

-- 
2.39.5

Re: [PATCH v4 10/10] drm/sun4i: use drm_atomic_helper_connector_hdmi_check()

[Maxime Ripard]

On Fri, 22 Nov 2024 11:13:06 +0200, Dmitry Baryshkov wrote:
> Replace sun4i_hdmi_connector_atomic_check(), which performs just TMDS
> char rate check, with drm_atomic_helper_connector_hdmi_check(), which
> performs additional checks basing on the HDMI Connector's state.
> 
> Suggested-by: Maxime Ripard <mripard@kernel.org>
> 
> [ ... ]

Reviewed-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime