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Message-Id: <20241109-hdmi-mode-valid-v3-1-5348c2368076@linaro.org>
Date: Sat, 09 Nov 2024 14:35:05 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Maíra Canal <mcanal@...lia.com>,
Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH v3 1/7] drm/display: hdmi: add generic mode_valid helper
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@...aro.org>
---
drivers/gpu/drm/display/drm_hdmi_state_helper.c | 21 +++
drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 181 ++++++++++++++++++++-
include/drm/display/drm_hdmi_state_helper.h | 4 +
3 files changed, 204 insertions(+), 2 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 294773342e710dc56772f839c2db9c2e487bbc1e..67c3e882592b00d803d8cba5d183aa90339a16b4 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 +43,14 @@ struct drm_atomic_helper_connector_hdmi_priv {
static struct drm_display_mode *find_preferred_mode(struct drm_connector *connector)
{
struct drm_device *drm = connector->dev;
- struct drm_display_mode *mode, *preferred;
+ struct drm_display_mode *mode, *preferred = NULL;
mutex_lock(&drm->mode_config.mutex);
- preferred = list_first_entry(&connector->modes, struct drm_display_mode, head);
+
+ /* Handle the case when all modes were rejected by mode_valid() */
+ if (!list_empty(&connector->modes))
+ preferred = list_first_entry(&connector->modes, struct drm_display_mode, head);
+
list_for_each_entry(mode, &connector->modes, head)
if (mode->type & DRM_MODE_TYPE_PREFERRED)
preferred = mode;
@@ -125,6 +129,18 @@ 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 =
@@ -147,6 +163,33 @@ 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 int dummy_connector_get_modes_100MHz_max_clock(struct drm_connector *connector)
+{
+ struct drm_atomic_helper_connector_hdmi_priv *priv =
+ connector_to_priv(connector);
+ const struct drm_edid *edid;
+ unsigned int num_modes;
+
+ edid = 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 = 100 * 1000;
+ num_modes = drm_edid_connector_add_modes(connector);
+
+ drm_edid_free(edid);
+
+ return num_modes;
+}
+
+static const struct drm_connector_helper_funcs dummy_connector_helper_funcs_max_tmds_clock = {
+ .atomic_check = drm_atomic_helper_connector_hdmi_check,
+ .get_modes = dummy_connector_get_modes_100MHz_max_clock,
+ .mode_valid = drm_hdmi_connector_mode_valid,
};
static void dummy_hdmi_connector_reset(struct drm_connector *connector)
@@ -1734,9 +1777,143 @@ static struct kunit_suite drm_atomic_helper_connector_hdmi_reset_test_suite = {
.test_cases = drm_atomic_helper_connector_hdmi_reset_tests,
};
+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_atomic_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);
+}
+
+/*
+ * Verify that tmds_char_rate_valid() can reject all modes.
+ */
+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 = drm_atomic_helper_connector_hdmi_init(test,
+ BIT(HDMI_COLORSPACE_RGB),
+ 8);
+ KUNIT_ASSERT_NOT_NULL(test, priv);
+
+ conn = &priv->connector;
+
+ /* You shouldn't be doing that at home. */
+ conn->hdmi.funcs = &reject_connector_hdmi_funcs;
+
+ priv->current_edid = test_edid_hdmi_1080p_rgb_max_200mhz;
+ priv->current_edid_len = ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz);
+
+ drm = &priv->drm;
+
+ mutex_lock(&drm->mode_config.mutex);
+ ret = conn->funcs->fill_modes(conn, 4096, 4096);
+ mutex_unlock(&drm->mode_config.mutex);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ preferred = find_preferred_mode(conn);
+ KUNIT_ASSERT_NULL(test, preferred);
+}
+
+/*
+ * Verify that tmds_char_rate_valid() can correctly filter out high-rate modes,
+ * but allows small modes.
+ */
+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_atomic_helper_connector_hdmi_init(test,
+ BIT(HDMI_COLORSPACE_RGB),
+ 8);
+ KUNIT_ASSERT_NOT_NULL(test, priv);
+
+ conn = &priv->connector;
+
+ /* You shouldn't be doing that at home. */
+ conn->hdmi.funcs = &reject_100_MHz_connector_hdmi_funcs;
+
+ 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_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);
+}
+
+/*
+ * Verify that the framework filters modes based on info.max_tmds_clock, while
+ * allowing small resolution modes.
+ */
+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_atomic_helper_connector_hdmi_init(test,
+ BIT(HDMI_COLORSPACE_RGB),
+ 8);
+ KUNIT_ASSERT_NOT_NULL(test, priv);
+
+ conn = &priv->connector;
+
+ drm_connector_helper_add(conn, &dummy_connector_helper_funcs_max_tmds_clock);
+
+ 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_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@...nel.org>");
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
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