linux-kernel - [PATCH 3/3] drm/vkms: Add support for XRGB2101010

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Message-Id: <20240516-writeback_line_by_line-v1-3-7b2e3bf9f1c9@bootlin.com>
Date: Thu, 16 May 2024 15:20:07 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>, 
 Maíra Canal <mairacanal@...eup.net>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 3/3] drm/vkms: Add support for XRGB2101010

Thanks to the WRITE_LINE macro, adding the format XRGB210101010 is trivial.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_formats.c   | 12 ++++++++++++
 drivers/gpu/drm/vkms/vkms_writeback.c |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index 51b1c04e6781..92f1b2f5a8dd 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -642,6 +642,14 @@ static void argb_u16_to_RGB565(u8 *out_pixel, const struct pixel_argb_u16 *in_pi
 	*pixel = cpu_to_le16(r << 11 | g << 5 | b);
 }
 
+static void argb_u16_to_XRGB2101010(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
+{
+	out_pixel[0] = (u8)(in_pixel->b & 0xFF);
+	out_pixel[1] = (u8)((in_pixel->b >> 8) & 0x03) | (u8)((in_pixel->g << 2) & 0xFC);
+	out_pixel[2] = (u8)((in_pixel->g >> 6) & 0x0F) | (u8)((in_pixel->r << 4) & 0xF0);
+	out_pixel[3] = (u8)((in_pixel->r >> 4) & 0x3F);
+}
+
 /**
  * WRITE_LINE() - Generic generator for write_line functions
  *
@@ -688,6 +696,8 @@ WRITE_LINE(XRGB16161616_write_line, argb_u16_to_XRGB16161616)
 
 WRITE_LINE(RGB565_write_line, argb_u16_to_RGB565)
 
+WRITE_LINE(XRGB2101010_write_line, argb_u16_to_XRGB2101010)
+
 /**
  * argb_u16_to_nothing() - pixel_write callback with no effect
  *
@@ -979,6 +989,8 @@ pixel_write_line_t get_pixel_write_line_function(u32 format)
 		return &XRGB16161616_write_line;
 	case DRM_FORMAT_RGB565:
 		return &RGB565_write_line;
+	case DRM_FORMAT_XRGB2101010:
+		return &XRGB2101010_write_line;
 	default:
 		/*
 		 * This is a bug in vkms_writeback_atomic_check. All the supported
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index 53bddcf33eab..c86020ef667a 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -21,7 +21,7 @@ static const u32 vkms_wb_formats[] = {
 	DRM_FORMAT_XRGB16161616,
 	DRM_FORMAT_ARGB16161616,
 	DRM_FORMAT_RGB565,
-	DRM_FORMAT_YUV422
+	DRM_FORMAT_XRGB2101010,
 };
 
 static const struct drm_connector_funcs vkms_wb_connector_funcs = {

-- 
2.43.2