[PATCH v5 19/22] drm/vc4: vec: Check for VEC output constraints

From: Maxime Ripard <maxime@cerno.tech>
To: Karol Herbst <kherbst@redhat.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	David Airlie <airlied@linux.ie>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Lyude Paul <lyude@redhat.com>, Maxime Ripard <mripard@kernel.org>,
	Emma Anholt <emma@anholt.net>, Chen-Yu Tsai <wens@csie.org>,
	Samuel Holland <samuel@sholland.org>,
	Ben Skeggs <bskeggs@redhat.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Dom Cobley <dom@raspberrypi.com>,
	Maxime Ripard <maxime@cerno.tech>,
	linux-sunxi@lists.linux.dev,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	Noralf Trønnes <noralf@tronnes.org>,
	intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	nouveau@lists.freedesktop.org,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	linux-arm-kernel@lists.infradead.org,
	Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>,
	dri-devel@lists.freedesktop.org,
	Hans de Goede <hdegoede@redhat.com>,
	Phil Elwell <phil@raspberrypi.com>
Subject: [PATCH v5 19/22] drm/vc4: vec: Check for VEC output constraints
Date: Thu, 13 Oct 2022 15:19:03 +0200	[thread overview]
Message-ID: <20220728-rpi-analog-tv-properties-v5-19-d841cc64fe4b@cerno.tech> (raw)
In-Reply-To: <20220728-rpi-analog-tv-properties-v5-0-d841cc64fe4b@cerno.tech>

From: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>

The VEC can accept pretty much any relatively reasonable mode, but still
has a bunch of constraints to meet.

Let's create an atomic_check() implementation that will make sure we
don't end up accepting a non-functional mode.

Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_vec.c | 48 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_vec.c b/drivers/gpu/drm/vc4/vc4_vec.c
index 90e375a8a8f9..1fcb7baf874e 100644
--- a/drivers/gpu/drm/vc4/vc4_vec.c
+++ b/drivers/gpu/drm/vc4/vc4_vec.c
@@ -453,6 +453,7 @@ static int vc4_vec_encoder_atomic_check(struct drm_encoder *encoder,
 					struct drm_crtc_state *crtc_state,
 					struct drm_connector_state *conn_state)
 {
+	const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 	const struct vc4_vec_tv_mode *vec_mode;
 
 	vec_mode = &vc4_vec_tv_modes[conn_state->tv.legacy_mode];
@@ -461,6 +462,53 @@ static int vc4_vec_encoder_atomic_check(struct drm_encoder *encoder,
 	    !drm_mode_equal(vec_mode->mode, &crtc_state->adjusted_mode))
 		return -EINVAL;
 
+	if (mode->crtc_hdisplay % 4)
+		return -EINVAL;
+
+	if (!(mode->crtc_hsync_end - mode->crtc_hsync_start))
+		return -EINVAL;
+
+	switch (mode->vtotal) {
+	case 525:
+		if (mode->crtc_vtotal > 262)
+			return -EINVAL;
+
+		if (mode->crtc_vdisplay < 1 || mode->crtc_vdisplay > 253)
+			return -EINVAL;
+
+		if (!(mode->crtc_vsync_start - mode->crtc_vdisplay))
+			return -EINVAL;
+
+		if ((mode->crtc_vsync_end - mode->crtc_vsync_start) != 3)
+			return -EINVAL;
+
+		if ((mode->crtc_vtotal - mode->crtc_vsync_end) < 4)
+			return -EINVAL;
+
+		break;
+
+	case 625:
+		if (mode->crtc_vtotal > 312)
+			return -EINVAL;
+
+		if (mode->crtc_vdisplay < 1 || mode->crtc_vdisplay > 305)
+			return -EINVAL;
+
+		if (!(mode->crtc_vsync_start - mode->crtc_vdisplay))
+			return -EINVAL;
+
+		if ((mode->crtc_vsync_end - mode->crtc_vsync_start) != 3)
+			return -EINVAL;
+
+		if ((mode->crtc_vtotal - mode->crtc_vsync_end) < 2)
+			return -EINVAL;
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
 	return 0;
 }
 

-- 
b4 0.11.0-dev-7da52

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