[PATCH v6 14/23] drm/modes: Properly generate a drm_display_mode from a named mode

[maxime at cerno.tech]

The framework will get the drm_display_mode from the drm_cmdline_mode it
got by parsing the video command line argument by calling
drm_connector_pick_cmdline_mode().

The heavy lifting will then be done by the drm_mode_create_from_cmdline_mode()
function.

In the case of the named modes though, there's no real code to make that
translation and we rely on the drivers to guess which actual display mode
we meant.

Let's modify drm_mode_create_from_cmdline_mode() to properly generate the
drm_display_mode we mean when passing a named mode.

Signed-off-by: Maxime Ripard <maxime at cerno.tech>

---
Changes in v6:
- Fix get_modes to return 0 instead of an error code
- Rename the tests to follow the DRM test naming convention

Changes in v5:
- Switched to KUNIT_ASSERT_NOT_NULL
---
 drivers/gpu/drm/drm_modes.c                     | 34 ++++++++++-
 drivers/gpu/drm/tests/drm_client_modeset_test.c | 77 ++++++++++++++++++++++++-
 2 files changed, 109 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index dc037f7ceb37..85aa9898c229 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -2497,6 +2497,36 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 }
 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
 
+static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
+					       struct drm_cmdline_mode *cmd)
+{
+	struct drm_display_mode *mode;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
+		const struct drm_named_mode *named_mode = &drm_named_modes[i];
+
+		if (strcmp(cmd->name, named_mode->name))
+			continue;
+
+		if (!named_mode->tv_mode)
+			continue;
+
+		mode = drm_analog_tv_mode(dev,
+					  named_mode->tv_mode,
+					  named_mode->pixel_clock_khz * 1000,
+					  named_mode->xres,
+					  named_mode->yres,
+					  named_mode->flags & DRM_MODE_FLAG_INTERLACE);
+		if (!mode)
+			return NULL;
+
+		return mode;
+	}
+
+	return NULL;
+}
+
 /**
  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
  * @dev: DRM device to create the new mode for
@@ -2514,7 +2544,9 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
 	if (cmd->xres == 0 || cmd->yres == 0)
 		return NULL;
 
-	if (cmd->cvt)
+	if (strlen(cmd->name))
+		mode = drm_named_mode(dev, cmd);
+	else if (cmd->cvt)
 		mode = drm_cvt_mode(dev,
 				    cmd->xres, cmd->yres,
 				    cmd->refresh_specified ? cmd->refresh : 60,
diff --git a/drivers/gpu/drm/tests/drm_client_modeset_test.c b/drivers/gpu/drm/tests/drm_client_modeset_test.c
index 3aa1acfe75df..fdfe9e20702e 100644
--- a/drivers/gpu/drm/tests/drm_client_modeset_test.c
+++ b/drivers/gpu/drm/tests/drm_client_modeset_test.c
@@ -21,7 +21,26 @@ struct drm_client_modeset_test_priv {
 
 static int drm_client_modeset_connector_get_modes(struct drm_connector *connector)
 {
-	return drm_add_modes_noedid(connector, 1920, 1200);
+	struct drm_display_mode *mode;
+	int count;
+
+	count = drm_add_modes_noedid(connector, 1920, 1200);
+
+	mode = drm_mode_analog_ntsc_480i(connector->dev);
+	if (!mode)
+		return count;
+
+	drm_mode_probed_add(connector, mode);
+	count += 1;
+
+	mode = drm_mode_analog_pal_576i(connector->dev);
+	if (!mode)
+		return count;
+
+	drm_mode_probed_add(connector, mode);
+	count += 1;
+
+	return count;
 }
 
 static const struct drm_connector_helper_funcs drm_client_modeset_connector_helper_funcs = {
@@ -52,6 +71,9 @@ static int drm_client_modeset_test_init(struct kunit *test)
 
 	drm_connector_helper_add(&priv->connector, &drm_client_modeset_connector_helper_funcs);
 
+	priv->connector.interlace_allowed = true;
+	priv->connector.doublescan_allowed = true;
+
 	return 0;
 
 }
@@ -85,9 +107,62 @@ static void drm_test_pick_cmdline_res_1920_1080_60(struct kunit *test)
 	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected_mode, mode));
 }
 
+static void drm_test_pick_cmdline_named_ntsc(struct kunit *test)
+{
+	struct drm_client_modeset_test_priv *priv = test->priv;
+	struct drm_device *drm = priv->drm;
+	struct drm_connector *connector = &priv->connector;
+	struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
+	struct drm_display_mode *mode;
+	const char *cmdline = "NTSC";
+	int ret;
+
+	KUNIT_ASSERT_TRUE(test,
+			  drm_mode_parse_command_line_for_connector(cmdline,
+								    connector,
+								    cmdline_mode));
+
+	mutex_lock(&drm->mode_config.mutex);
+	ret = drm_helper_probe_single_connector_modes(connector, 1920, 1080);
+	mutex_unlock(&drm->mode_config.mutex);
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	mode = drm_connector_pick_cmdline_mode(connector);
+	KUNIT_ASSERT_NOT_NULL(test, mode);
+
+	KUNIT_EXPECT_TRUE(test, drm_mode_equal(drm_mode_analog_ntsc_480i(drm), mode));
+}
+
+static void drm_test_pick_cmdline_named_pal(struct kunit *test)
+{
+	struct drm_client_modeset_test_priv *priv = test->priv;
+	struct drm_device *drm = priv->drm;
+	struct drm_connector *connector = &priv->connector;
+	struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
+	struct drm_display_mode *mode;
+	const char *cmdline = "PAL";
+	int ret;
+
+	KUNIT_ASSERT_TRUE(test,
+			  drm_mode_parse_command_line_for_connector(cmdline,
+								    connector,
+								    cmdline_mode));
+
+	mutex_lock(&drm->mode_config.mutex);
+	ret = drm_helper_probe_single_connector_modes(connector, 1920, 1080);
+	mutex_unlock(&drm->mode_config.mutex);
+	KUNIT_ASSERT_GT(test, ret, 0);
+
+	mode = drm_connector_pick_cmdline_mode(connector);
+	KUNIT_ASSERT_NOT_NULL(test, mode);
+
+	KUNIT_EXPECT_TRUE(test, drm_mode_equal(drm_mode_analog_pal_576i(drm), mode));
+}
 
 static struct kunit_case drm_test_pick_cmdline_tests[] = {
 	KUNIT_CASE(drm_test_pick_cmdline_res_1920_1080_60),
+	KUNIT_CASE(drm_test_pick_cmdline_named_ntsc),
+	KUNIT_CASE(drm_test_pick_cmdline_named_pal),
 	{}
 };
 

-- 
b4 0.11.0-dev-99e3a