linux-kernel - [RFC PATCH v3 3/3] drm/panel: vtdr6130: Use 16-bit brightness function

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Date:   Mon, 16 Jan 2023 17:49:09 -0500
From:   Richard Acayan <mailingradian@...il.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Vinay Simha BN <simhavcs@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Daniel Mentz <danielmentz@...gle.com>,
        Caleb Connolly <caleb@...nolly.tech>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Richard Acayan <mailingradian@...il.com>
Subject: [RFC PATCH v3 3/3] drm/panel: vtdr6130: Use 16-bit brightness function

This panel communicates brightness in big endian. This is not a quirk of
the panels themselves, but rather, a part of the MIPI standard. Use the
new mipi_dsi_dcs_set_display_brightness_large() function that properly
handles 16-bit brightness instead of bypassing the brightness functions
entirely.

Signed-off-by: Richard Acayan <mailingradian@...il.com>
---
 drivers/gpu/drm/panel/panel-visionox-vtdr6130.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
index f9a6abc1e121..1092075b31a5 100644
--- a/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
+++ b/drivers/gpu/drm/panel/panel-visionox-vtdr6130.c
@@ -243,12 +243,9 @@ static int visionox_vtdr6130_bl_update_status(struct backlight_device *bl)
 {
 	struct mipi_dsi_device *dsi = bl_get_data(bl);
 	u16 brightness = backlight_get_brightness(bl);
-	/* Panel needs big-endian order of brightness value */
-	u8 payload[2] = { brightness >> 8, brightness & 0xff };
 	int ret;
 
-	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
-				 payload, sizeof(payload));
+	mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
 	if (ret < 0)
 		return ret;
 
-- 
2.39.0