linux-kernel - [PATCH 5/8] drm/tidss: dt property to force 16bit VP output to a 24bit bridge

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Message-ID: <20220719080845.22122-6-a-bhatia1@ti.com>
Date:   Tue, 19 Jul 2022 13:38:42 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Tomi Valkeinen <tomba@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Darren Etheridge <detheridge@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rahul T R <r-ravikumar@...com>,
        Krunal Bhargav <k-bhargav@...com>,
        Devarsh Thakkar <devarsht@...com>,
        DRI Development List <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/8] drm/tidss: dt property to force 16bit VP output to a 24bit bridge

Override the DSS Videoport to output 16bit RGB565 instead of 24bit
RGB888 when the dt property "ti,rgb565-to-888" has been enanbled.

Co-developed-by: Darren Etheridge <detheridge@...com>
Signed-off-by: Darren Etheridge <detheridge@...com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 drivers/gpu/drm/tidss/tidss_dispc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index fb1fdecfc83a..94fce035c1d7 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -896,6 +896,8 @@ struct dispc_bus_format *dispc_vp_find_bus_fmt(struct dispc_device *dispc,
 	if (dispc->feat->vp_bus_type[hw_videoport] == DISPC_VP_OLDI &&
 	    dispc->oldi_mode == OLDI_DUAL_LINK)
 		is_dual_link = true;
+	else if (bus_fmt == MEDIA_BUS_FMT_RGB888_1X24 && dispc->rgb565_to_888)
+		bus_fmt = MEDIA_BUS_FMT_RGB565_1X16;
 
 	for (i = 0; i < ARRAY_SIZE(dispc_bus_formats); ++i) {
 		if (dispc_bus_formats[i].bus_fmt == bus_fmt &&
-- 
2.37.0