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SubjectRe: [PATCH 7/9] drm/i915/gvt: Constify formats
Date
On 12/4/2021 12:55 PM, Rikard Falkeborn wrote:
> These are never modified, so make them const to allow the compiler to
> put them in read-only memory. WHile at it, make the description const
> char* since it is never modified.
>
> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
> ---
> drivers/gpu/drm/i915/gvt/fb_decoder.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/fb_decoder.c b/drivers/gpu/drm/i915/gvt/fb_decoder.c
> index 11a8baba6822..3c8736ae8fed 100644
> --- a/drivers/gpu/drm/i915/gvt/fb_decoder.c
> +++ b/drivers/gpu/drm/i915/gvt/fb_decoder.c
> @@ -40,12 +40,12 @@
>
> #define PRIMARY_FORMAT_NUM 16
> struct pixel_format {
> - int drm_format; /* Pixel format in DRM definition */
> - int bpp; /* Bits per pixel, 0 indicates invalid */
> - char *desc; /* The description */
> + int drm_format; /* Pixel format in DRM definition */
> + int bpp; /* Bits per pixel, 0 indicates invalid */
> + const char *desc; /* The description */
> };
Thanks so much for this. According to the code of i915, we prefer using
one space as seperator.
>
> -static struct pixel_format bdw_pixel_formats[] = {
> +static const struct pixel_format bdw_pixel_formats[] = {
> {DRM_FORMAT_C8, 8, "8-bit Indexed"},
> {DRM_FORMAT_RGB565, 16, "16-bit BGRX (5:6:5 MSB-R:G:B)"},
> {DRM_FORMAT_XRGB8888, 32, "32-bit BGRX (8:8:8:8 MSB-X:R:G:B)"},
> @@ -58,7 +58,7 @@ static struct pixel_format bdw_pixel_formats[] = {
> {0, 0, NULL},
> };
>
> -static struct pixel_format skl_pixel_formats[] = {
> +static const struct pixel_format skl_pixel_formats[] = {
> {DRM_FORMAT_YUYV, 16, "16-bit packed YUYV (8:8:8:8 MSB-V:Y2:U:Y1)"},
> {DRM_FORMAT_UYVY, 16, "16-bit packed UYVY (8:8:8:8 MSB-Y2:V:Y1:U)"},
> {DRM_FORMAT_YVYU, 16, "16-bit packed YVYU (8:8:8:8 MSB-U:Y2:V:Y1)"},
> @@ -278,14 +278,14 @@ int intel_vgpu_decode_primary_plane(struct intel_vgpu *vgpu,
>
> #define CURSOR_FORMAT_NUM (1 << 6)
> struct cursor_mode_format {
> - int drm_format; /* Pixel format in DRM definition */
> - u8 bpp; /* Bits per pixel; 0 indicates invalid */
> - u32 width; /* In pixel */
> - u32 height; /* In lines */
> - char *desc; /* The description */
> + int drm_format; /* Pixel format in DRM definition */
> + u8 bpp; /* Bits per pixel; 0 indicates invalid */
> + u32 width; /* In pixel */
> + u32 height; /* In lines */
> + const char *desc; /* The description */
> };
The same comment as above.
> -static struct cursor_mode_format cursor_pixel_formats[] = {
> +static const struct cursor_mode_format cursor_pixel_formats[] = {
> {DRM_FORMAT_ARGB8888, 32, 128, 128, "128x128 32bpp ARGB"},
> {DRM_FORMAT_ARGB8888, 32, 256, 256, "256x256 32bpp ARGB"},
> {DRM_FORMAT_ARGB8888, 32, 64, 64, "64x64 32bpp ARGB"},
> @@ -391,7 +391,7 @@ int intel_vgpu_decode_cursor_plane(struct intel_vgpu *vgpu,
>
> #define SPRITE_FORMAT_NUM (1 << 3)
>
> -static struct pixel_format sprite_pixel_formats[SPRITE_FORMAT_NUM] = {
> +static const struct pixel_format sprite_pixel_formats[SPRITE_FORMAT_NUM] = {
> [0x0] = {DRM_FORMAT_YUV422, 16, "YUV 16-bit 4:2:2 packed"},
> [0x1] = {DRM_FORMAT_XRGB2101010, 32, "RGB 32-bit 2:10:10:10"},
> [0x2] = {DRM_FORMAT_XRGB8888, 32, "RGB 32-bit 8:8:8:8"},

The rest of the patch looks good to me.

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