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udl-kms: avoid prefetch

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Modern processors can detect linear memory accesses and prefetch data
automatically, so there's no need to use prefetch.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Mikulas Patocka 2018-06-03 16:41:01 +02:00 committed by Dave Airlie
parent 91ba11fb7d
commit 58cba7c222
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/udl/udl_transfer.c
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@ -13,7 +13,6 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/prefetch.h>
#include <asm/unaligned.h>
#include <drm/drmP.h>
@ -51,9 +50,6 @@ static int udl_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
int start = width;
int end = width;
prefetch((void *) front);
prefetch((void *) back);
for (j = 0; j < width; j++) {
if (back[j] != front[j]) {
start = j;
@ -140,8 +136,6 @@ static void udl_compress_hline16(
const u8 *cmd_pixel_start, *cmd_pixel_end = NULL;
uint16_t pixel_val16;
prefetchw((void *) cmd); /* pull in one cache line at least */
*cmd++ = 0xaf;
*cmd++ = 0x6b;
*cmd++ = (uint8_t) ((dev_addr >> 16) & 0xFF);
@ -158,7 +152,6 @@ static void udl_compress_hline16(
(unsigned long)(pixel_end - pixel) >> log_bpp,
(unsigned long)(cmd_buffer_end - 1 - cmd) / 2) << log_bpp);
prefetch_range((void *) pixel, cmd_pixel_end - pixel);
pixel_val16 = get_pixel_val16(pixel, log_bpp);
while (pixel < cmd_pixel_end) {