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drm/vkms: Fix RGB565 pixel conversion

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[ Upstream commit ab87f558dcfb2562c3497e89600dec798a446665 ]

Currently, the pixel conversion isn't rounding the fixed-point values
before assigning it to the RGB coefficients, which is causing the IGT
pixel-format tests to fail. So, use the drm_fixp2int_round() fixed-point
helper to round the values when assigning it to the RGB coefficients.

Tested with igt@kms_plane@pixel-format and igt@kms_plane@pixel-format-source-clamping.

[v2]:
    * Use drm_fixp2int_round() to fix the pixel conversion instead of
      casting the values to s32 (Melissa Wen).

Fixes: 89b03aeaef ("drm/vkms: fix 32bit compilation error by replacing macros")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Arthur Grillo <arthurgrillo@riseup.net>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512104044.65034-2-mcanal@igalia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maíra Canal 2023-05-12 07:40:45 -03:00 committed by Greg Kroah-Hartman
parent 048b7168ac
commit 7a3c39e34c
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/vkms/vkms_formats.c
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@ -97,9 +97,9 @@ static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
s64 fp_b = drm_int2fixp(rgb_565 & 0x1f);
out_pixel->a = (u16)0xffff;
out_pixel->r = drm_fixp2int(drm_fixp_mul(fp_r, fp_rb_ratio));
out_pixel->g = drm_fixp2int(drm_fixp_mul(fp_g, fp_g_ratio));
out_pixel->b = drm_fixp2int(drm_fixp_mul(fp_b, fp_rb_ratio));
out_pixel->r = drm_fixp2int_round(drm_fixp_mul(fp_r, fp_rb_ratio));
out_pixel->g = drm_fixp2int_round(drm_fixp_mul(fp_g, fp_g_ratio));
out_pixel->b = drm_fixp2int_round(drm_fixp_mul(fp_b, fp_rb_ratio));
}
void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state *plane, int y)
@ -216,9 +216,9 @@ static void argb_u16_to_RGB565(struct vkms_frame_info *frame_info,
s64 fp_g = drm_int2fixp(in_pixels[x].g);
s64 fp_b = drm_int2fixp(in_pixels[x].b);
u16 r = drm_fixp2int(drm_fixp_div(fp_r, fp_rb_ratio));
u16 g = drm_fixp2int(drm_fixp_div(fp_g, fp_g_ratio));
u16 b = drm_fixp2int(drm_fixp_div(fp_b, fp_rb_ratio));
u16 r = drm_fixp2int_round(drm_fixp_div(fp_r, fp_rb_ratio));
u16 g = drm_fixp2int_round(drm_fixp_div(fp_g, fp_g_ratio));
u16 b = drm_fixp2int_round(drm_fixp_div(fp_b, fp_rb_ratio));
*dst_pixels = cpu_to_le16(r << 11 | g << 5 | b);
}