linux-kernel - [PATCH 01/37] drm/vc4: Limit max

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Message-Id: <20241023-drm-vc4-2712-support-v1-1-1cc2d5594907@raspberrypi.com>
Date: Wed, 23 Oct 2024 17:49:58 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <mripard@...nel.org>, 
 Maíra Canal <mcanal@...lia.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Javier Martinez Canillas <javierm@...hat.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: [PATCH 01/37] drm/vc4: Limit max_bpc to 8 on Pi0-3

Pi 0-3 have no deep colour support and only 24bpp output,
so max_bpc should remain as 8, and no HDR metadata property
should be registered.

Fixes: ba8c0faebbb0 ("drm/vc4: hdmi: Enable 10/12 bpc output")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 62b82b1eeb36..6ebcc38be291 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -640,6 +640,11 @@ static int vc4_hdmi_connector_init(struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	if (vc4_hdmi->variant->supports_hdr)
+		drm_connector_attach_max_bpc_property(connector, 8, 12);
+	else
+		drm_connector_attach_max_bpc_property(connector, 8, 8);
+
 	drm_connector_attach_encoder(connector, encoder);
 
 	return 0;

-- 
2.34.1