linux-kernel - [PATCH 1/4] DRM: ARC: PGU: fix framebuffer format switching

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Date:   Tue, 19 Nov 2019 17:41:44 +0300
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     dri-devel@...ts.freedesktop.org,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Subject: [PATCH 1/4] DRM: ARC: PGU: fix framebuffer format switching

Current implementation don't switch to RGB565 format if BGR888 was
previously used. Fix that.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
---
 drivers/gpu/drm/arc/arcpgu_crtc.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
index dfaddbb7da0d..31d9824c46cc 100644
--- a/drivers/gpu/drm/arc/arcpgu_crtc.c
+++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
@@ -32,6 +32,7 @@ static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
 	uint32_t pixel_format = fb->format->format;
 	struct simplefb_format *format = NULL;
 	int i;
+	u32 reg_ctrl;
 
 	for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
 		if (supported_formats[i].fourcc == pixel_format)
@@ -41,11 +42,12 @@ static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
 	if (WARN_ON(!format))
 		return;
 
-	if (format->fourcc == DRM_FORMAT_RGB888)
-		arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
-			      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
-					   ARCPGU_MODE_RGB888_MASK);
-
+	reg_ctrl = arc_pgu_read(arcpgu, ARCPGU_REG_CTRL);
+	if (format->fourcc == DRM_FORMAT_RGB565)
+		reg_ctrl &= ~ARCPGU_MODE_RGB888_MASK;
+	else
+		reg_ctrl |= ARCPGU_MODE_RGB888_MASK;
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL, reg_ctrl);
 }
 
 static const struct drm_crtc_funcs arc_pgu_crtc_funcs = {
-- 
2.21.0