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Message-Id: <20240930-yuv-v11-4-4b1a26bcfc96@bootlin.com>
Date: Mon, 30 Sep 2024 17:31:44 +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>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Jonathan Corbet <corbet@....net>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, Simona Vetter <simona@...ll.ch>, 
 rdunlap@...radead.org, arthurgrillo@...eup.net, 
 pekka.paalanen@...oniitty.fi, Simona Vetter <simona.vetter@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, thomas.petazzoni@...tlin.com, 
 jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com, 
 seanpaul@...gle.com, marcheu@...gle.com, nicolejadeyee@...gle.com, 
 Pekka Paalanen <pekka.paalanen@...labora.com>, 
 Maíra Canal <mcanal@...lia.com>
Subject: [PATCH v11 04/15] drm/vkms: Use const for input pointers in
 pixel_read an pixel_write functions

As the pixel_read and pixel_write function should never modify the input
buffer, mark those pointers const.

Reviewed-by: Pekka Paalanen <pekka.paalanen@...labora.com>
Reviewed-by: Maíra Canal <mcanal@...lia.com>
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/vkms/vkms_drv.h     |  4 ++--
 drivers/gpu/drm/vkms/vkms_formats.c | 20 ++++++++++----------
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 137348f4adb2..a3020c49d1b3 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -61,7 +61,7 @@ struct line_buffer {
  * @out_pixel: destination address to write the pixel
  * @in_pixel: pixel to write
  */
-typedef void (*pixel_write_t)(u8 *out_pixel, struct pixel_argb_u16 *in_pixel);
+typedef void (*pixel_write_t)(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel);
 
 struct vkms_writeback_job {
 	struct iosys_map data[DRM_FORMAT_MAX_PLANES];
@@ -76,7 +76,7 @@ struct vkms_writeback_job {
  * @in_pixel: pointer to the pixel to read
  * @out_pixel: pointer to write the converted pixel
  */
-typedef void (*pixel_read_t)(u8 *in_pixel, struct pixel_argb_u16 *out_pixel);
+typedef void (*pixel_read_t)(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel);
 
 /**
  * struct vkms_plane_state - Driver specific plane state
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index b9544e67cd4f..06aef5162529 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -75,7 +75,7 @@ static int get_x_position(const struct vkms_frame_info *frame_info, int limit, i
  * They are used in the vkms_compose_row() function to handle multiple formats.
  */
 
-static void ARGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
+static void ARGB8888_to_argb_u16(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 {
 	/*
 	 * The 257 is the "conversion ratio". This number is obtained by the
@@ -89,7 +89,7 @@ static void ARGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 	out_pixel->b = (u16)in_pixel[0] * 257;
 }
 
-static void XRGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
+static void XRGB8888_to_argb_u16(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 {
 	out_pixel->a = (u16)0xffff;
 	out_pixel->r = (u16)in_pixel[2] * 257;
@@ -97,7 +97,7 @@ static void XRGB8888_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 	out_pixel->b = (u16)in_pixel[0] * 257;
 }
 
-static void ARGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
+static void ARGB16161616_to_argb_u16(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 {
 	__le16 *pixel = (__le16 *)in_pixel;
 
@@ -107,7 +107,7 @@ static void ARGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pi
 	out_pixel->b = le16_to_cpu(pixel[0]);
 }
 
-static void XRGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
+static void XRGB16161616_to_argb_u16(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 {
 	__le16 *pixel = (__le16 *)in_pixel;
 
@@ -117,7 +117,7 @@ static void XRGB16161616_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pi
 	out_pixel->b = le16_to_cpu(pixel[0]);
 }
 
-static void RGB565_to_argb_u16(u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
+static void RGB565_to_argb_u16(const u8 *in_pixel, struct pixel_argb_u16 *out_pixel)
 {
 	__le16 *pixel = (__le16 *)in_pixel;
 
@@ -173,7 +173,7 @@ void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state
  * They are used in vkms_writeback_row() to convert and store a pixel from the src_buffer to
  * the writeback buffer.
  */
-static void argb_u16_to_ARGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
+static void argb_u16_to_ARGB8888(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
 {
 	/*
 	 * This sequence below is important because the format's byte order is
@@ -191,7 +191,7 @@ static void argb_u16_to_ARGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
 	out_pixel[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
 }
 
-static void argb_u16_to_XRGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
+static void argb_u16_to_XRGB8888(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
 {
 	out_pixel[3] = 0xff;
 	out_pixel[2] = DIV_ROUND_CLOSEST(in_pixel->r, 257);
@@ -199,7 +199,7 @@ static void argb_u16_to_XRGB8888(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
 	out_pixel[0] = DIV_ROUND_CLOSEST(in_pixel->b, 257);
 }
 
-static void argb_u16_to_ARGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
+static void argb_u16_to_ARGB16161616(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
 {
 	__le16 *pixel = (__le16 *)out_pixel;
 
@@ -209,7 +209,7 @@ static void argb_u16_to_ARGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pi
 	pixel[0] = cpu_to_le16(in_pixel->b);
 }
 
-static void argb_u16_to_XRGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
+static void argb_u16_to_XRGB16161616(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
 {
 	__le16 *pixel = (__le16 *)out_pixel;
 
@@ -219,7 +219,7 @@ static void argb_u16_to_XRGB16161616(u8 *out_pixel, struct pixel_argb_u16 *in_pi
 	pixel[0] = cpu_to_le16(in_pixel->b);
 }
 
-static void argb_u16_to_RGB565(u8 *out_pixel, struct pixel_argb_u16 *in_pixel)
+static void argb_u16_to_RGB565(u8 *out_pixel, const struct pixel_argb_u16 *in_pixel)
 {
 	__le16 *pixel = (__le16 *)out_pixel;
 

-- 
2.46.2


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