[PATCH v1 12/35] drmi/modes: Properly generate a drm_display_mode from a named mode

From: Maxime Ripard <maxime@cerno.tech>
To: "Jernej Skrabec" <jernej.skrabec@gmail.com>,
	"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>,
	"Chen-Yu Tsai" <wens@csie.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Jerome Brunet" <jbrunet@baylibre.com>,
	"Samuel Holland" <samuel@sholland.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Emma Anholt" <emma@anholt.net>,
	"David Airlie" <airlied@linux.ie>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Noralf Trønnes" <noralf@tronnes.org>,
	"Kevin Hilman" <khilman@baylibre.com>,
	"Neil Armstrong" <narmstrong@baylibre.com>,
	"Maxime Ripard" <mripard@kernel.org>
Cc: Maxime Ripard <maxime@cerno.tech>,
	linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
	Phil Elwell <phil@raspberrypi.com>,
	Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	linux-amlogic@lists.infradead.org,
	dri-devel@lists.freedesktop.org, Dom Cobley <dom@raspberrypi.com>
Subject: [PATCH v1 12/35] drmi/modes: Properly generate a drm_display_mode from a named mode
Date: Fri, 29 Jul 2022 18:34:55 +0200	[thread overview]
Message-ID: <20220728-rpi-analog-tv-properties-v1-12-3d53ae722097@cerno.tech> (raw)
In-Reply-To: <20220728-rpi-analog-tv-properties-v1-0-3d53ae722097@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@cerno.tech>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 78ea520f2822..ecb2e83cf860 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1967,6 +1967,28 @@ 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;
+
+		mode = drm_mode_duplicate(dev, named_mode->mode);
+		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
@@ -1984,7 +2006,9 @@ 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_mode_test.c b/drivers/gpu/drm/tests/drm_mode_test.c
index 0f71519788a7..006b73a61fd4 100644
--- a/drivers/gpu/drm/tests/drm_mode_test.c
+++ b/drivers/gpu/drm/tests/drm_mode_test.c
@@ -34,6 +34,18 @@ static int drm_mode_connector_get_modes(struct drm_connector *connector)
 	if (ret)
 		return ret;
 
+	mode = drm_mode_duplicate(connector->dev, &drm_mode_480i);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_probed_add(connector, mode);
+
+	mode = drm_mode_duplicate(connector->dev, &drm_mode_576i);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_probed_add(connector, mode);
+
 	return 0;
 }
 
@@ -75,6 +87,9 @@ static int drm_mode_test_init(struct kunit *test)
 		return ret;
 	drm_connector_helper_add(&priv->connector, &drm_mode_connector_helper_funcs);
 
+	priv->connector.interlace_allowed = true;
+	priv->connector.doublescan_allowed = true;
+
 	return 0;
 }
 
@@ -115,8 +130,62 @@ static void drm_mode_res_1920_1080_60(struct kunit *test)
 	KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected_mode, mode));
 }
 
+static void drm_mode_named_ntsc(struct kunit *test)
+{
+	struct drm_mode_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_PTR_NE(test, mode, NULL);
+
+	KUNIT_EXPECT_TRUE(test, drm_mode_equal(&drm_mode_480i, mode));
+}
+
+static void drm_mode_named_pal(struct kunit *test)
+{
+	struct drm_mode_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_PTR_NE(test, mode, NULL);
+
+	KUNIT_EXPECT_TRUE(test, drm_mode_equal(&drm_mode_576i, mode));
+}
+
 static struct kunit_case drm_mode_tests[] = {
 	KUNIT_CASE(drm_mode_res_1920_1080_60),
+	KUNIT_CASE(drm_mode_named_ntsc),
+	KUNIT_CASE(drm_mode_named_pal),
 	{}
 };
 

-- 
b4 0.10.0-dev-49460
