[RESEND 6/6 v2] drm/vc4: dpi: Support DPI interface in mode3 for RGB565

From: Chris Morgan <macroalpha82@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	thierry.reding@gmail.com, sam@ravnborg.org, airlied@linux.ie,
	daniel@ffwll.ch, robh+dt@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, mchehab@kernel.org,
	emma@anholt.net, mripard@kernel.org,
	Chris Morgan <macromorgan@hotmail.com>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>
Subject: [RESEND 6/6 v2] drm/vc4: dpi: Support DPI interface in mode3 for RGB565
Date: Thu, 19 May 2022 11:29:35 -0500	[thread overview]
Message-ID: <20220519162935.1585-7-macroalpha82@gmail.com> (raw)
In-Reply-To: <20220519162935.1585-1-macroalpha82@gmail.com>

From: Chris Morgan <macromorgan@hotmail.com>

Add support for the VC4 DPI driver to utilize DPI mode 3. This is
defined here as xxxRRRRRxxGGGGGGxxxBBBBB:
https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#parallel-display-interface-dpi

This mode is required to use the Geekworm MZP280 DPI display.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 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 c180eb60b..3c58ade25 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -173,6 +173,10 @@ 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);
 			break;
-- 
2.25.1

