linux-kernel - [PATCH 4/7] drm/vc4: dpi: Support RGB565 format

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Message-Id: <20221013-rpi-dpi-improvements-v1-4-8a7a96949cb0@cerno.tech>
Date:   Thu, 13 Oct 2022 11:56:48 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Maxime Ripard <mripard@...nel.org>, Eric Anholt <eric@...olt.net>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>, Rob Herring <robh@...nel.org>,
        Emma Anholt <emma@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        Joerg Quinten <aBUGSworstnightmare@...il.com>,
        Chris Morgan <macromorgan@...mail.com>,
        Maxime Ripard <maxime@...no.tech>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH 4/7] drm/vc4: dpi: Support RGB565 format

From: Chris Morgan <macromorgan@...mail.com>

The RGB565 format with padding over 24 bits
(MEDIA_BUS_FMT_RGB565_1X24_CPADHI) is supported by the vc4 DPI
controller as "mode 3".  This is what the Geekworm MZP280 DPI display
uses, so let's add support for it in the DPI controller driver.

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Chris Morgan <macromorgan@...mail.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index 1f8f44b7b5a5..7da3dd1db50e 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -182,6 +182,10 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
 				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
 						       DPI_FORMAT);
 				break;
+			case MEDIA_BUS_FMT_RGB565_1X24_CPADHI:
+				dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_2,
+						       DPI_FORMAT);
+				break;
 			default:
 				DRM_ERROR("Unknown media bus format %d\n",
 					  bus_format);

-- 
b4 0.11.0-dev-7da52