github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-31 03:27:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/vc4: plane: Optimize the LBM allocation size

Browse Source 
The current code is using the maximum of the source line size and the
destination line size to compute the size of the LBM to allocate.

While this is simpler, it starts to be an issue with modes such as 4k with
a quite long that will consume all the available memory, so we no longer
have that luxury.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b9e091883a4f7395c5b6a4f7c6070225934293db.1599120059.git-series.maxime@cerno.tech
This commit is contained in:
Dave Stevenson 2020-09-03 10:00:37 +02:00 committed by Maxime Ripard
parent 31e0ecb39b
commit 5630b27ec5
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
1 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/vc4/vc4_plane.c
View File

@ -437,10 +437,7 @@ static void vc4_write_ppf(struct vc4_plane_state *vc4_state, u32 src, u32 dst)
static u32 vc4_lbm_size(struct drm_plane_state *state)
{
struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
/* This is the worst case number. One of the two sizes will
* be used depending on the scaling configuration.
*/
u32 pix_per_line = max(vc4_state->src_w[0], (u32)vc4_state->crtc_w);
u32 pix_per_line;
u32 lbm;
/* LBM is not needed when there's no vertical scaling. */
@ -448,6 +445,18 @@ static u32 vc4_lbm_size(struct drm_plane_state *state)
vc4_state->y_scaling[1] == VC4_SCALING_NONE)
return 0;
/*
* This can be further optimized in the RGB/YUV444 case if the PPF
* decimation factor is between 0.5 and 1.0 by using crtc_w.
*
* It's not an issue though, since in that case since src_w[0] is going
* to be greater than or equal to crtc_w.
*/
if (vc4_state->x_scaling[0] == VC4_SCALING_TPZ)
pix_per_line = vc4_state->crtc_w;
else
pix_per_line = vc4_state->src_w[0];
if (!vc4_state->is_yuv) {
if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
lbm = pix_per_line * 8;