linux-kernel - Re: [PATCH v1 14/35] drm/atomic-helper: Add an analog TV atomic

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Date:   Fri, 29 Jul 2022 19:16:31 +0200
From:   Mateusz Kwiatkowski <kfyatek@...il.com>
To:     Maxime Ripard <maxime@...no.tech>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Maxime Ripard <mripard@...nel.org>
Cc:     linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v1 14/35] drm/atomic-helper: Add an analog TV atomic_check
 implementation

Hi Maxime,

I'm pretty sure that PAL-60 and SECAM-60 should be tied to the 480i 
mode. Those are non-standard "norms" that use 60 Hz sync (which is 
largely synonymous with 480i in the analog TV world) with PAL/SECAM 
color encoding.

Best regards,
Mateusz Kwiatkowski

W dniu 29.07.2022 o 18:34, Maxime Ripard pisze:
> The analog TV connector drivers share some atomic_check logic, and the new
> TV standard property have created a bunch of new constraints that needs to
> be shared across drivers too.
>
> Let's create an atomic_check helper for those use cases.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index 6d14cb0c64b1..fce5569bd66a 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -552,6 +552,93 @@ void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
>   }
>   EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
>   
> +/**
> + * @drm_atomic_helper_connector_tv_check: Validate an analog TV connector state
> + * @connector: DRM Connector
> + * @state: the DRM State object
> + *
> + * Checks the state object to see if the requested state is valid for an
> + * analog TV connector.
> + *
> + * Returns:
> + * Zero for success, a negative error code on error.
> + */
> +int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
> +					 struct drm_atomic_state *state)
> +{
> +	struct drm_connector_state *old_conn_state =
> +		drm_atomic_get_old_connector_state(state, connector);
> +	struct drm_connector_state *new_conn_state =
> +		drm_atomic_get_new_connector_state(state, connector);
> +	const struct drm_display_mode *mode;
> +	struct drm_crtc_state *crtc_state;
> +	struct drm_crtc *crtc;
> +
> +	crtc = new_conn_state->crtc;
> +	if (!crtc)
> +		return 0;
> +
> +	crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
> +	if (!crtc_state)
> +		return -EINVAL;
> +
> +	switch (new_conn_state->tv.norm) {
> +	case DRM_MODE_TV_NORM_NTSC_443:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_NTSC_J:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_NTSC_M:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_M:
> +		mode = &drm_mode_480i;
> +		break;
> +
> +	case DRM_MODE_TV_NORM_PAL_60:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_B:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_D:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_G:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_H:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_I:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_N:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_PAL_NC:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_60:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_B:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_D:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_G:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_K:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_K1:
> +		fallthrough;
> +	case DRM_MODE_TV_NORM_SECAM_L:
> +		mode = &drm_mode_576i;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (!drm_mode_equal(mode, &crtc_state->mode))
> +		return -EINVAL;
> +
> +	if (old_conn_state->tv.norm != new_conn_state->tv.norm)
> +		crtc_state->mode_changed = true;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
> +
>   /**
>    * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
>    * @connector: connector object
> diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
> index c8fbce795ee7..b9740edb2658 100644
> --- a/include/drm/drm_atomic_state_helper.h
> +++ b/include/drm/drm_atomic_state_helper.h
> @@ -26,6 +26,7 @@
>   
>   #include <linux/types.h>
>   
> +struct drm_atomic_state;
>   struct drm_bridge;
>   struct drm_bridge_state;
>   struct drm_crtc;
> @@ -71,6 +72,8 @@ void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
>   					 struct drm_connector_state *conn_state);
>   void drm_atomic_helper_connector_reset(struct drm_connector *connector);
>   void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector);
> +int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
> +					 struct drm_atomic_state *state);
>   void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector);
>   void
>   __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
>