iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/amd/display: Force p-state disallow if leaving no plane config

Browse Source 
[ Upstream commit 9a902a9073c287353e25913c0761bfed49d75a88 ]

[Description]
- When we're in a no plane config, DCN is always asserting
  P-State allow
- This creates a scenario where the P-State blackout can start
  just as VUPDATE takes place and transitions the DCN config to
  a one where one or more HUBP's are active which can result in
  underflow
- To fix this issue, force p-state disallow and unforce after
  the transition from no planes case -> one or more planes active

Reviewed-by: Samson Tam <samson.tam@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alvin Lee 2023-12-06 14:52:32 -05:00 committed by Greg Kroah-Hartman
parent 6750d1de74
commit e9ca61a7e6
1 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
View File

@ -1792,6 +1792,8 @@ void dcn20_program_front_end_for_ctx(
int i;
struct dce_hwseq *hws = dc->hwseq;
DC_LOGGER_INIT(dc->ctx->logger);
unsigned int prev_hubp_count = 0;
unsigned int hubp_count = 0;
/* Carry over GSL groups in case the context is changing. */
for (i = 0; i < dc->res_pool->pipe_count; i++) {
@ -1815,6 +1817,20 @@ void dcn20_program_front_end_for_ctx(
}
}
for (i = 0; i < dc->res_pool->pipe_count; i++) {
if (dc->current_state->res_ctx.pipe_ctx[i].plane_state)
prev_hubp_count++;
if (context->res_ctx.pipe_ctx[i].plane_state)
hubp_count++;
}
if (prev_hubp_count == 0 && hubp_count > 0) {
if (dc->res_pool->hubbub->funcs->force_pstate_change_control)
dc->res_pool->hubbub->funcs->force_pstate_change_control(
dc->res_pool->hubbub, true, false);
udelay(500);
}
/* Set pipe update flags and lock pipes */
for (i = 0; i < dc->res_pool->pipe_count; i++)
dcn20_detect_pipe_changes(&dc->current_state->res_ctx.pipe_ctx[i],
@ -1962,6 +1978,10 @@ void dcn20_post_unlock_program_front_end(
}
}
if (dc->res_pool->hubbub->funcs->force_pstate_change_control)
dc->res_pool->hubbub->funcs->force_pstate_change_control(
dc->res_pool->hubbub, false, false);
for (i = 0; i < dc->res_pool->pipe_count; i++) {
struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];