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Message-ID: <CAPY8ntCzdxJ5zyk4eeWV8D+WBdfri61ttoNxVtJUZSAKHoMpGQ@mail.gmail.com>
Date: Thu, 14 Dec 2023 14:39:51 +0000
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
Jonathan Corbet <corbet@....net>,
Sandy Huang <hjc@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, Hans Verkuil <hverkuil@...all.nl>,
linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v5 06/44] drm/connector: Introduce an HDMI connector
initialization function
Hi Maxime
As requested, I'm just going through patches 6-16.
I will say that I've been less thorough in checking the kunit test
code in this series than the core code changes, and I'm trusting that
all the unit tests pass.
I get a build failure on the complete series for arm64 with the
standard defconfig
depmod: ERROR: Cycle detected: drm_display_helper -> drm_kms_helper ->
drm_display_helper
depmod: ERROR: Cycle detected: drm
depmod: ERROR: Found 2 modules in dependency cycles!
I haven't followed it through as to the reason, but obviously that
will need to be addressed.
Dave
On Thu, 7 Dec 2023 at 15:49, Maxime Ripard <mripard@...nel.org> wrote:
>
> A lot of the various HDMI drivers duplicate some logic that depends on
> the HDMI spec itself and not really a particular hardware
> implementation.
>
> Output BPC or format selection, infoframe generation are good examples
> of such areas.
>
> This creates a lot of boilerplate, with a lot of variations, which makes
> it hard for userspace to rely on, and makes it difficult to get it right
> for drivers.
>
> In the next patches, we'll add a lot of infrastructure around the
> drm_connector and drm_connector_state structures, which will allow to
> abstract away the duplicated logic. This infrastructure comes with a few
> requirements though, and thus we need a new initialization function.
>
> Hopefully, this will make drivers simpler to handle, and their behaviour
> more consistent.
>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> ---
> drivers/gpu/drm/drm_connector.c | 39 +++++++++
> drivers/gpu/drm/tests/drm_connector_test.c | 123 +++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 5 ++
> 3 files changed, 167 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index b0516505f7ae..d9961cce8245 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -452,6 +452,45 @@ int drmm_connector_init(struct drm_device *dev,
> }
> EXPORT_SYMBOL(drmm_connector_init);
>
> +/**
> + * drmm_connector_hdmi_init - Init a preallocated HDMI connector
> + * @dev: DRM device
> + * @connector: A pointer to the HDMI connector to init
> + * @funcs: callbacks for this connector
> + * @connector_type: user visible type of the connector
> + * @ddc: optional pointer to the associated ddc adapter
> + *
> + * Initialises a preallocated HDMI connector. Connectors can be
> + * subclassed as part of driver connector objects.
> + *
> + * Cleanup is automatically handled with a call to
> + * drm_connector_cleanup() in a DRM-managed action.
> + *
> + * The connector structure should be allocated with drmm_kzalloc().
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int drmm_connector_hdmi_init(struct drm_device *dev,
> + struct drm_connector *connector,
> + const struct drm_connector_funcs *funcs,
> + int connector_type,
> + struct i2c_adapter *ddc)
> +{
> + int ret;
> +
> + if (!(connector_type == DRM_MODE_CONNECTOR_HDMIA ||
> + connector_type == DRM_MODE_CONNECTOR_HDMIB))
> + return -EINVAL;
> +
> + ret = drmm_connector_init(dev, connector, funcs, connector_type, ddc);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drmm_connector_hdmi_init);
> +
> /**
> * drm_connector_attach_edid_property - attach edid property.
> * @connector: the connector
> diff --git a/drivers/gpu/drm/tests/drm_connector_test.c b/drivers/gpu/drm/tests/drm_connector_test.c
> index a268847be8d1..8f070cacab3b 100644
> --- a/drivers/gpu/drm/tests/drm_connector_test.c
> +++ b/drivers/gpu/drm/tests/drm_connector_test.c
> @@ -172,6 +172,128 @@ static struct kunit_suite drmm_connector_init_test_suite = {
> .test_cases = drmm_connector_init_tests,
> };
>
> +/*
> + * Test that the registration of a bog standard connector works as
> + * expected and doesn't report any error.
> + */
> +static void drm_test_connector_hdmi_init_valid(struct kunit *test)
> +{
> + struct drm_connector_init_priv *priv = test->priv;
> + int ret;
> +
> + ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> + &dummy_funcs,
> + DRM_MODE_CONNECTOR_HDMIA,
> + &priv->ddc);
> + KUNIT_EXPECT_EQ(test, ret, 0);
> +}
> +
> +/*
> + * Test that the registration of a connector without a DDC adapter
> + * doesn't report any error.
> + */
> +static void drm_test_connector_hdmi_init_null_ddc(struct kunit *test)
> +{
> + struct drm_connector_init_priv *priv = test->priv;
> + int ret;
> +
> + ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> + &dummy_funcs,
> + DRM_MODE_CONNECTOR_HDMIA,
> + NULL);
> + KUNIT_EXPECT_EQ(test, ret, 0);
> +}
> +
> +/*
> + * Test that the registration of an HDMI connector with an HDMI
> + * connector type succeeds.
> + */
> +static void drm_test_connector_hdmi_init_type_valid(struct kunit *test)
> +{
> + struct drm_connector_init_priv *priv = test->priv;
> + unsigned int connector_type = *(unsigned int *)test->param_value;
> + int ret;
> +
> + ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> + &dummy_funcs,
> + connector_type,
> + &priv->ddc);
> + KUNIT_EXPECT_EQ(test, ret, 0);
> +}
> +
> +static const unsigned int drm_connector_hdmi_init_type_valid_tests[] = {
> + DRM_MODE_CONNECTOR_HDMIA,
> + DRM_MODE_CONNECTOR_HDMIB,
> +};
> +
> +static void drm_connector_hdmi_init_type_desc(const unsigned int *type, char *desc)
> +{
> + sprintf(desc, "%s", drm_get_connector_type_name(*type));
> +}
> +
> +KUNIT_ARRAY_PARAM(drm_connector_hdmi_init_type_valid,
> + drm_connector_hdmi_init_type_valid_tests,
> + drm_connector_hdmi_init_type_desc);
> +
> +/*
> + * Test that the registration of an HDMI connector with an !HDMI
> + * connector type fails.
> + */
> +static void drm_test_connector_hdmi_init_type_invalid(struct kunit *test)
> +{
> + struct drm_connector_init_priv *priv = test->priv;
> + unsigned int connector_type = *(unsigned int *)test->param_value;
> + int ret;
> +
> + ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> + &dummy_funcs,
> + connector_type,
> + &priv->ddc);
> + KUNIT_EXPECT_LT(test, ret, 0);
> +}
> +
> +static const unsigned int drm_connector_hdmi_init_type_invalid_tests[] = {
> + DRM_MODE_CONNECTOR_Unknown,
> + DRM_MODE_CONNECTOR_VGA,
> + DRM_MODE_CONNECTOR_DVII,
> + DRM_MODE_CONNECTOR_DVID,
> + DRM_MODE_CONNECTOR_DVIA,
> + DRM_MODE_CONNECTOR_Composite,
> + DRM_MODE_CONNECTOR_SVIDEO,
> + DRM_MODE_CONNECTOR_LVDS,
> + DRM_MODE_CONNECTOR_Component,
> + DRM_MODE_CONNECTOR_9PinDIN,
> + DRM_MODE_CONNECTOR_DisplayPort,
> + DRM_MODE_CONNECTOR_TV,
> + DRM_MODE_CONNECTOR_eDP,
> + DRM_MODE_CONNECTOR_VIRTUAL,
> + DRM_MODE_CONNECTOR_DSI,
> + DRM_MODE_CONNECTOR_DPI,
> + DRM_MODE_CONNECTOR_WRITEBACK,
> + DRM_MODE_CONNECTOR_SPI,
> + DRM_MODE_CONNECTOR_USB,
> +};
> +
> +KUNIT_ARRAY_PARAM(drm_connector_hdmi_init_type_invalid,
> + drm_connector_hdmi_init_type_invalid_tests,
> + drm_connector_hdmi_init_type_desc);
> +
> +static struct kunit_case drmm_connector_hdmi_init_tests[] = {
> + KUNIT_CASE(drm_test_connector_hdmi_init_valid),
> + KUNIT_CASE(drm_test_connector_hdmi_init_null_ddc),
> + KUNIT_CASE_PARAM(drm_test_connector_hdmi_init_type_valid,
> + drm_connector_hdmi_init_type_valid_gen_params),
> + KUNIT_CASE_PARAM(drm_test_connector_hdmi_init_type_invalid,
> + drm_connector_hdmi_init_type_invalid_gen_params),
> + { }
> +};
> +
> +static struct kunit_suite drmm_connector_hdmi_init_test_suite = {
> + .name = "drmm_connector_hdmi_init",
> + .init = drm_test_connector_init,
> + .test_cases = drmm_connector_hdmi_init_tests,
> +};
> +
> struct drm_get_tv_mode_from_name_test {
> const char *name;
> enum drm_connector_tv_mode expected_mode;
> @@ -236,6 +358,7 @@ static struct kunit_suite drm_get_tv_mode_from_name_test_suite = {
> };
>
> kunit_test_suites(
> + &drmm_connector_hdmi_init_test_suite,
> &drmm_connector_init_test_suite,
> &drm_get_tv_mode_from_name_test_suite
> );
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index fe88d7fc6b8f..4491c4c2fb6e 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1904,6 +1904,11 @@ int drmm_connector_init(struct drm_device *dev,
> const struct drm_connector_funcs *funcs,
> int connector_type,
> struct i2c_adapter *ddc);
> +int drmm_connector_hdmi_init(struct drm_device *dev,
> + struct drm_connector *connector,
> + const struct drm_connector_funcs *funcs,
> + int connector_type,
> + struct i2c_adapter *ddc);
> void drm_connector_attach_edid_property(struct drm_connector *connector);
> int drm_connector_register(struct drm_connector *connector);
> void drm_connector_unregister(struct drm_connector *connector);
>
> --
> 2.43.0
>
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