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Date: Tue, 8 Nov 2022 10:40:07 +0100
From: Noralf Trønnes <noralf@...nnes.org>
To: Maxime Ripard <maxime@...no.tech>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Ben Skeggs <bskeggs@...hat.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Maxime Ripard <mripard@...nel.org>,
Samuel Holland <samuel@...lland.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Emma Anholt <emma@...olt.net>,
Karol Herbst <kherbst@...hat.com>,
Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>,
Lyude Paul <lyude@...hat.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>
Cc: Phil Elwell <phil@...pberrypi.com>,
Hans de Goede <hdegoede@...hat.com>,
linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
linux-arm-kernel@...ts.infradead.org,
Dom Cobley <dom@...pberrypi.com>,
Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
nouveau@...ts.freedesktop.org,
Noralf Trønnes <noralf@...nnes.org>
Subject: Re: [PATCH v7 14/23] drm/modes: Properly generate a drm_display_mode
from a named mode
Den 07.11.2022 18.49, skrev Noralf Trønnes:
>
>
> Den 07.11.2022 15.16, skrev Maxime Ripard:
>> 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@...no.tech>
>>
>> ---
>> Changes in v7:
>> - Use tv_mode_specified in drm_mode_parse_command_line_for_connector
>>
>> 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..49441cabdd9d 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 (!cmd->tv_mode_specified)
>> + continue;
>
> Only a named mode will set cmd->name, so is this check necessary?
>
>> +
>> + 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;
>
> You can just return the result from drm_analog_tv_mode() directly.
>
> With those considered:
>
> Reviewed-by: Noralf Trønnes <noralf@...nnes.org>
>
I forgot one thing, shouldn't the named mode test in
drm_connector_pick_cmdline_mode() be removed now that we have proper modes?
Noralf.
>> + }
>> +
>> + 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),
>> {}
>> };
>>
>>
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