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drm/udl: optimize udl_compress_hline16 (v2) 

The run-length encoding algorithm should compare 16-bit encoded pixel
values instead of comparing raw pixel values. It allows pixels
with similar but different colors to be encoded as repeat pixels, and
thus potentially save USB bandwidth.

Signed-off-by: Haixia Shi <hshi@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Haixia Shi <hshi@chromium.org>
Signed-off-by: Dave Airlie <airlied@gmail.com>
This commit is contained in:
Haixia Shi 2015-01-30 10:51:14 -08:00 committed by Dave Airlie
parent e410055331
commit 865844448c
1 changed files with 18 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/gpu/drm/udl/udl_transfer.c
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@ -82,12 +82,14 @@ static inline u16 pixel32_to_be16(const uint32_t pixel)
((pixel >> 8) & 0xf800));
}
static bool pixel_repeats(const void *pixel, const uint32_t repeat, int bpp)
static inline u16 get_pixel_val16(const uint8_t *pixel, int bpp)
{
u16 pixel_val16 = 0;
if (bpp == 2)
return *(const uint16_t *)pixel == repeat;
else
return *(const uint32_t *)pixel == repeat;
pixel_val16 = *(const uint16_t *)pixel;
else if (bpp == 4)
pixel_val16 = pixel32_to_be16(*(const uint32_t *)pixel);
return pixel_val16;
}
/*
@ -134,6 +136,7 @@ static void udl_compress_hline16(
uint8_t *cmd_pixels_count_byte = NULL;
const u8 *raw_pixel_start = NULL;
const u8 *cmd_pixel_start, *cmd_pixel_end = NULL;
uint16_t pixel_val16;
prefetchw((void *) cmd); /* pull in one cache line at least */
@ -154,33 +157,29 @@ static void udl_compress_hline16(
(int)(cmd_buffer_end - cmd) / 2))) * bpp;
prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
pixel_val16 = get_pixel_val16(pixel, bpp);
while (pixel < cmd_pixel_end) {
const u8 *const start = pixel;
u32 repeating_pixel;
const uint16_t repeating_pixel_val16 = pixel_val16;
if (bpp == 2) {
repeating_pixel = *(uint16_t *)pixel;
*(uint16_t *)cmd = cpu_to_be16(repeating_pixel);
} else {
repeating_pixel = *(uint32_t *)pixel;
*(uint16_t *)cmd = cpu_to_be16(pixel32_to_be16(repeating_pixel));
}
*(uint16_t *)cmd = cpu_to_be16(pixel_val16);
cmd += 2;
pixel += bpp;
if (unlikely((pixel < cmd_pixel_end) &&
(pixel_repeats(pixel, repeating_pixel, bpp)))) {
while (pixel < cmd_pixel_end) {
pixel_val16 = get_pixel_val16(pixel, bpp);
if (pixel_val16 != repeating_pixel_val16)
break;
pixel += bpp;
}
if (unlikely(pixel > start + bpp)) {
/* go back and fill in raw pixel count */
*raw_pixels_count_byte = (((start -
raw_pixel_start) / bpp) + 1) & 0xFF;
while ((pixel < cmd_pixel_end) &&
(pixel_repeats(pixel, repeating_pixel, bpp))) {
pixel += bpp;
}
/* immediately after raw data is repeat byte */
*cmd++ = (((pixel - start) / bpp) - 1) & 0xFF;