summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/udl
diff options
context:
space:
mode:
authorMikulas Patocka <mpatocka@redhat.com>2018-06-03 17:41:01 +0300
committerDave Airlie <airlied@redhat.com>2018-07-31 01:11:12 +0300
commit58cba7c222e8c87bb6b61fcba21d1536145221b0 (patch)
treea3996ae88be6b5ed459ec0c08ed37bd24d55bb3f /drivers/gpu/drm/udl
parent91ba11fb7d7ca0a3bbe8a512e65e666e2ec1e889 (diff)
downloadlinux-58cba7c222e8c87bb6b61fcba21d1536145221b0.tar.xz
udl-kms: avoid prefetch
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>
Diffstat (limited to 'drivers/gpu/drm/udl')
-rw-r--r--drivers/gpu/drm/udl/udl_transfer.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/gpu/drm/udl/udl_transfer.c b/drivers/gpu/drm/udl/udl_transfer.c
index f3331d33547a..ce87661e544f 100644
--- a/drivers/gpu/drm/udl/udl_transfer.c
+++ b/drivers/gpu/drm/udl/udl_transfer.c
@@ -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) {