linux-kernel - [PATCH v3 6/7] drm/vc4: dpi: Change the default DPI format to being 18bpp, not 24.

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Message-Id: <20221013-rpi-dpi-improvements-v3-6-eb76e26a772d@cerno.tech>
Date:   Thu, 01 Dec 2022 09:42:51 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Maxime Ripard <mripard@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>,
        David Airlie <airlied@...ux.ie>, Emma Anholt <emma@...olt.net>,
        Eric Anholt <eric@...olt.net>
Cc:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>,
        dri-devel@...ts.freedesktop.org,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Chris Morgan <macromorgan@...mail.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Joerg Quinten <aBUGSworstnightmare@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 6/7] drm/vc4: dpi: Change the default DPI format to being 18bpp,
 not 24.

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

DPI hasn't really been used up until now, so the default has
been meaningless.
In theory we should be able to pass the desired format for the
adjacent bridge chip through, but framework seems to be missing
for that.

As the main device to use DPI is the VGA666 or Adafruit Kippah,
both of which use RGB666, change the default to being RGB666 instead
of RGB888.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index ecbe4cd87036..fdae02760b6d 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -150,8 +150,8 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
 	}
 	drm_connector_list_iter_end(&conn_iter);
 
-	/* Default to 24bit if no connector or format found. */
-	dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, DPI_FORMAT);
+	/* Default to 18bit if no connector or format found. */
+	dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, DPI_FORMAT);
 
 	if (connector) {
 		if (connector->display_info.num_bus_formats) {

-- 
b4 0.10.1