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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241101-hdmi-mode-valid-v2-1-a6478fd20fa6@linaro.org> References: <20241101-hdmi-mode-valid-v2-0-a6478fd20fa6@linaro.org> In-Reply-To: <20241101-hdmi-mode-valid-v2-0-a6478fd20fa6@linaro.org> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Dave Stevenson , =?utf-8?q?Ma=C3=ADra_Canal?= , Raspberry Pi Kernel Maintenance , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=12996; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=kVBUKzWAeHVvHBydx3EkRE4Q3REprXqMLr3/QDo5buM=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBnJB/h+qQ1svDVzgd0LXjIU1mOZYulRshe8N4cO hhkv1trDDmJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZyQf4QAKCRCLPIo+Aiko 1YsEB/oCWybrGbF8Zp55m5T5SgJSWWMvmHdwta73P4TbzdbYxcw2s2JeW3ZdBed51YYxvd29orC p6PB0KX/CZKEEyn4Xp9ZqQYRtEo4BZufIesiJxN6SWc+jisZtmmNry8JkoNh0C6UaLeip2k6dF3 HHISp68oCmsgCVPYX7oPUN3Yv27H8YXfd1/UllhI2fuAMNtl4txBzdiPwRlvJpZEKv3CkGnOgeP QTdDn7BX88d9AjlBozZcgJa5Hib1obJ31EY57vKWvMxLt1vgPH5PIE1g94Nmq01lQdsUoZvV3GJ HjeNxTzyfa42+vFSYu0Zppy75ikECUbDVNoTowRpSr3FDqub X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A 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 --- drivers/gpu/drm/display/drm_hdmi_helper.c | 45 ++++++ drivers/gpu/drm/display/drm_hdmi_helper_internal.h | 11 ++ drivers/gpu/drm/display/drm_hdmi_state_helper.c | 26 +--- drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 168 +++++++++++++++++= +++- include/drm/display/drm_hdmi_helper.h | 4 + 5 files changed, 229 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/display/drm_hdmi_helper.c b/drivers/gpu/drm/di= splay/drm_hdmi_helper.c index 74dd4d01dd9bb2c9e69ec1c60b0056bd69417e8a..560c5d4365ca54d3f669395349c= edfd6f75fa033 100644 --- a/drivers/gpu/drm/display/drm_hdmi_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_helper.c @@ -9,6 +9,8 @@ #include #include =20 +#include "drm_hdmi_helper_internal.h" + static inline bool is_eotf_supported(u8 output_eotf, u8 sink_eotf) { return sink_eotf & BIT(output_eotf); @@ -256,3 +258,46 @@ drm_hdmi_compute_mode_clock(const struct drm_display_m= ode *mode, return DIV_ROUND_CLOSEST_ULL(clock * bpc, 8); } EXPORT_SYMBOL(drm_hdmi_compute_mode_clock); + +enum drm_mode_status +__drm_hdmi_connector_clock_valid(const struct drm_connector *connector, + const struct drm_display_mode *mode, + unsigned long long clock) +{ + const struct drm_connector_hdmi_funcs *funcs =3D connector->hdmi.funcs; + const struct drm_display_info *info =3D &connector->display_info; + + if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000) + return MODE_CLOCK_HIGH; + + if (funcs && funcs->tmds_char_rate_valid) { + enum drm_mode_status status; + + status =3D funcs->tmds_char_rate_valid(connector, mode, clock); + if (status !=3D MODE_OK) + return status; + } + + return MODE_OK; +} + +/** + * drm_hdmi_connector_mode_valid() - Check if mode is valid for HDMI conne= ctor + * @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 =3D drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB); + if (!clock) + return MODE_ERROR; + + return __drm_hdmi_connector_clock_valid(connector, mode, clock); +} +EXPORT_SYMBOL(drm_hdmi_connector_mode_valid); diff --git a/drivers/gpu/drm/display/drm_hdmi_helper_internal.h b/drivers/g= pu/drm/display/drm_hdmi_helper_internal.h new file mode 100644 index 0000000000000000000000000000000000000000..ee74435c04f62cf71b9857bdc42= 7c46442b85697 --- /dev/null +++ b/drivers/gpu/drm/display/drm_hdmi_helper_internal.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: MIT */ + +#ifndef DRM_DP_HELPER_INTERNAL_H +#define DRM_DP_HELPER_INTERNAL_H + +enum drm_mode_status +__drm_hdmi_connector_clock_valid(const struct drm_connector *connector, + const struct drm_display_mode *mode, + unsigned long long clock); + +#endif diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/= drm/display/drm_hdmi_state_helper.c index feb7a3a759811aed70c679be8704072093e2a79b..29c2cb2c3171366a2a68fc6ad48= f8ad8a4dc7e30 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -8,6 +8,8 @@ #include #include =20 +#include "drm_hdmi_helper_internal.h" + /** * __drm_atomic_helper_connector_hdmi_reset() - Initializes all HDMI @drm_= connector_state resources * @connector: DRM connector @@ -198,28 +200,6 @@ sink_supports_format_bpc(const struct drm_connector *c= onnector, return false; } =20 -static enum drm_mode_status -hdmi_clock_valid(const struct drm_connector *connector, - const struct drm_display_mode *mode, - unsigned long long clock) -{ - const struct drm_connector_hdmi_funcs *funcs =3D connector->hdmi.funcs; - const struct drm_display_info *info =3D &connector->display_info; - - if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000) - return MODE_CLOCK_HIGH; - - if (funcs && funcs->tmds_char_rate_valid) { - enum drm_mode_status status; - - status =3D funcs->tmds_char_rate_valid(connector, mode, clock); - if (status !=3D MODE_OK) - return status; - } - - return MODE_OK; -} - static int hdmi_compute_clock(const struct drm_connector *connector, struct drm_connector_state *conn_state, @@ -233,7 +213,7 @@ hdmi_compute_clock(const struct drm_connector *connecto= r, if (!clock) return -EINVAL; =20 - status =3D hdmi_clock_valid(connector, mode, clock); + status =3D __drm_hdmi_connector_clock_valid(connector, mode, clock); if (status !=3D MODE_OK) return -EINVAL; =20 diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/g= pu/drm/tests/drm_hdmi_state_helper_test.c index 34ee95d41f2966ab23a60deb37d689430f6b0985..8640e7280053bd95852f53b9215= 9f493b141f2bf 100644 --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c @@ -43,10 +43,12 @@ struct drm_atomic_helper_connector_hdmi_priv { static struct drm_display_mode *find_preferred_mode(struct drm_connector *= connector) { struct drm_device *drm =3D connector->dev; - struct drm_display_mode *mode, *preferred; + struct drm_display_mode *mode, *preferred =3D NULL; =20 mutex_lock(&drm->mode_config.mutex); - preferred =3D list_first_entry(&connector->modes, struct drm_display_mode= , head); + if (!list_empty(&connector->modes)) + preferred =3D list_first_entry(&connector->modes, struct drm_display_mod= e, head); + list_for_each_entry(mode, &connector->modes, head) if (mode->type & DRM_MODE_TYPE_PREFERRED) preferred =3D mode; @@ -125,6 +127,18 @@ static const struct drm_connector_hdmi_funcs reject_co= nnector_hdmi_funcs =3D { .tmds_char_rate_valid =3D reject_connector_tmds_char_rate_valid, }; =20 +static enum drm_mode_status +reject_100MHz_connector_tmds_char_rate_valid(const struct drm_connector *c= onnector, + 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 =3D { + .tmds_char_rate_valid =3D 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 =3D @@ -147,6 +161,33 @@ static int dummy_connector_get_modes(struct drm_connec= tor *connector) static const struct drm_connector_helper_funcs dummy_connector_helper_func= s =3D { .atomic_check =3D drm_atomic_helper_connector_hdmi_check, .get_modes =3D dummy_connector_get_modes, + .mode_valid =3D drm_hdmi_connector_mode_valid, +}; + +static int dummy_connector_get_modes_100MHz_max_clock(struct drm_connector= *connector) +{ + struct drm_atomic_helper_connector_hdmi_priv *priv =3D + connector_to_priv(connector); + const struct drm_edid *edid; + unsigned int num_modes; + + edid =3D drm_edid_alloc(priv->current_edid, priv->current_edid_len); + if (!edid) + return -EINVAL; + + drm_edid_connector_update(connector, edid); + connector->display_info.max_tmds_clock =3D 100 * 1000; + num_modes =3D drm_edid_connector_add_modes(connector); + + drm_edid_free(edid); + + return num_modes; +} + +static const struct drm_connector_helper_funcs dummy_connector_helper_func= s_max_tmds_clock =3D { + .atomic_check =3D drm_atomic_helper_connector_hdmi_check, + .get_modes =3D dummy_connector_get_modes_100MHz_max_clock, + .mode_valid =3D drm_hdmi_connector_mode_valid, }; =20 static void dummy_hdmi_connector_reset(struct drm_connector *connector) @@ -1734,9 +1775,132 @@ static struct kunit_suite drm_atomic_helper_connect= or_hdmi_reset_test_suite =3D { .test_cases =3D drm_atomic_helper_connector_hdmi_reset_tests, }; =20 +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 =3D drm_atomic_helper_connector_hdmi_init(test, + BIT(HDMI_COLORSPACE_RGB), + 8); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + preferred =3D 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); +} + +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; + struct drm_device *drm; + int ret; + + priv =3D drm_atomic_helper_connector_hdmi_init(test, + BIT(HDMI_COLORSPACE_RGB), + 8); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + + /* You shouldn't be doing that at home. */ + conn->hdmi.funcs =3D &reject_connector_hdmi_funcs; + + priv->current_edid =3D test_edid_hdmi_1080p_rgb_max_200mhz; + priv->current_edid_len =3D ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz= ); + + drm =3D &priv->drm; + + mutex_lock(&drm->mode_config.mutex); + ret =3D conn->funcs->fill_modes(conn, 4096, 4096); + mutex_unlock(&drm->mode_config.mutex); + KUNIT_ASSERT_EQ(test, ret, 0); + + preferred =3D find_preferred_mode(conn); + KUNIT_ASSERT_NULL(test, preferred); +} + +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 =3D drm_atomic_helper_connector_hdmi_init(test, + BIT(HDMI_COLORSPACE_RGB), + 8); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + + /* You shouldn't be doing that at home. */ + conn->hdmi.funcs =3D &reject_100_MHz_connector_hdmi_funcs; + + ret =3D 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 =3D 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 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 =3D drm_atomic_helper_connector_hdmi_init(test, + BIT(HDMI_COLORSPACE_RGB), + 8); + KUNIT_ASSERT_NOT_NULL(test, priv); + + conn =3D &priv->connector; + + drm_connector_helper_add(conn, &dummy_connector_helper_funcs_max_tmds_clo= ck); + + ret =3D 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 =3D 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= [] =3D { + 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 =3D { + .name =3D "drm_atomic_helper_connector_hdmi_mode_valid", + .test_cases =3D 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, ); =20 MODULE_AUTHOR("Maxime Ripard "); diff --git a/include/drm/display/drm_hdmi_helper.h b/include/drm/display/dr= m_hdmi_helper.h index 57e3b18c15ec79636d89267aba0e88f434c5d4db..93f0e566257338fb6e9a1f0b2cc= 14ce9c97ec0a5 100644 --- a/include/drm/display/drm_hdmi_helper.h +++ b/include/drm/display/drm_hdmi_helper.h @@ -28,4 +28,8 @@ unsigned long long drm_hdmi_compute_mode_clock(const struct drm_display_mode *mode, unsigned int bpc, enum hdmi_colorspace fmt); =20 +enum drm_mode_status +drm_hdmi_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode); + #endif --=20 2.39.5