linux-kernel - Re: [PATCH v4 08/23] drm/tests: hdmi: Add macro to simplify EDID setup

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Message-ID: <87cycwy5n4.fsf@intel.com>
Date: Mon, 28 Apr 2025 12:52:47 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>, 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>, Dave Stevenson
 <dave.stevenson@...pberrypi.com>, Dmitry Baryshkov
 <dmitry.baryshkov@....qualcomm.com>, Dmitry Baryshkov <lumag@...nel.org>,
 Dmitry Baryshkov <lumag@...nel.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/23] drm/tests: hdmi: Add macro to simplify EDID setup

On Fri, 25 Apr 2025, Cristian Ciocaltea <cristian.ciocaltea@...labora.com> wrote:
> Factor out the HDMI connector initialization from
> drm_kunit_helper_connector_hdmi_init_funcs() into a common
> __connector_hdmi_init() function, while extending its functionality to
> allow setting custom (i.e. non-default) EDID data.
>
> Introduce a macro as a wrapper over the new helper to allow dropping the
> open coded EDID setup from all test cases.
>
> The actual conversion will be handled separately; for now just apply it
> to drm_kunit_helper_connector_hdmi_init() helper.
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 46 +++++++++++++---------
>  1 file changed, 28 insertions(+), 18 deletions(-)
>
> 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 c8dc6fa0f925e35e9903a18bac7f78f9d8165960..36734639d19a3f279abc4631eb19d5c2b20ca315 100644
> --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> @@ -140,10 +140,11 @@ static const struct drm_connector_funcs dummy_connector_funcs = {
>  
>  static
>  struct drm_atomic_helper_connector_hdmi_priv *
> -drm_kunit_helper_connector_hdmi_init_funcs(struct kunit *test,
> -					   unsigned int formats,
> -					   unsigned int max_bpc,
> -					   const struct drm_connector_hdmi_funcs *hdmi_funcs)
> +__connector_hdmi_init(struct kunit *test,
> +		      unsigned int formats,
> +		      unsigned int max_bpc,
> +		      const struct drm_connector_hdmi_funcs *hdmi_funcs,
> +		      const char *edid_data, size_t edid_len)

char* is weird for EDID data, but it's a pre-existing thing, and
actually making it unsigned char or u8 isn't much better.

A follow-up could switch edid_data to just const void *, and ditto for
set_connector_edid() and current_edid member in struct
drm_atomic_helper_connector_hdmi_priv.

BR,
Jani.

>  {
>  	struct drm_atomic_helper_connector_hdmi_priv *priv;
>  	struct drm_connector *conn;
> @@ -197,29 +198,38 @@ drm_kunit_helper_connector_hdmi_init_funcs(struct kunit *test,
>  
>  	drm_mode_config_reset(drm);
>  
> +	if (edid_data && edid_len) {
> +		ret = set_connector_edid(test, &priv->connector, edid_data, edid_len);
> +		KUNIT_ASSERT_GT(test, ret, 0);
> +	}
> +
>  	return priv;
>  }
>  
> +static
> +struct drm_atomic_helper_connector_hdmi_priv *
> +drm_kunit_helper_connector_hdmi_init_funcs(struct kunit *test,
> +					   unsigned int formats,
> +					   unsigned int max_bpc,
> +					   const struct drm_connector_hdmi_funcs *hdmi_funcs)
> +{
> +	return __connector_hdmi_init(test, formats, max_bpc, hdmi_funcs, NULL, 0);
> +}
> +
> +#define drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test, formats, max_bpc, funcs, edid) \
> +	__connector_hdmi_init(test, formats, max_bpc, funcs, edid, ARRAY_SIZE(edid))
> +
>  static
>  struct drm_atomic_helper_connector_hdmi_priv *
>  drm_kunit_helper_connector_hdmi_init(struct kunit *test,
>  				     unsigned int formats,
>  				     unsigned int max_bpc)
>  {
> -	struct drm_atomic_helper_connector_hdmi_priv *priv;
> -	int ret;
> -
> -	priv = drm_kunit_helper_connector_hdmi_init_funcs(test,
> -							  formats, max_bpc,
> -							  &dummy_connector_hdmi_funcs);
> -	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
> -
> -	ret = set_connector_edid(test, &priv->connector,
> -				 test_edid_hdmi_1080p_rgb_max_200mhz,
> -				 ARRAY_SIZE(test_edid_hdmi_1080p_rgb_max_200mhz));
> -	KUNIT_ASSERT_GT(test, ret, 0);
> -
> -	return priv;
> +	return drm_kunit_helper_connector_hdmi_init_with_edid_funcs(test,
> +				formats,
> +				max_bpc,
> +				&dummy_connector_hdmi_funcs,
> +				test_edid_hdmi_1080p_rgb_max_200mhz);
>  }
>  
>  /*

-- 
Jani Nikula, Intel