diff options
| author | Wyatt Wood <wyatt.wood@amd.com> | 2020-09-11 04:50:52 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-09-22 19:28:49 +0300 |
| commit | a9edc81564c92b4d86670b722bbe8906e0dfd934 (patch) | |
| tree | d5cc66ba1c76bdcc38c1da8efd9ea75bad23e1d9 /drivers/gpu/drm/amd/display/dc/dce | |
| parent | b50d55517da2c79cb9045bc175bcbf99098a0e28 (diff) | |
| download | linux-a9edc81564c92b4d86670b722bbe8906e0dfd934.tar.xz | |
drm/amd/display: Implement PSR wait for enable/disable
[Why]
For DMUB implementation of PSR, the 'wait' parameter,
used to determine if driver should wait for PSR enable/disable,
is not implemented correctly.
[How]
Implement wait for PSR enable/disable.
Signed-off-by: Wyatt Wood <wyatt.wood@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c | 27 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dmub_psr.h | 2 |
2 files changed, 27 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c index 5167d6b8a48d..bf24f1029547 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.c @@ -119,10 +119,11 @@ static bool dmub_psr_set_version(struct dmub_psr *dmub, struct dc_stream_state * /** * Enable/Disable PSR. */ -static void dmub_psr_enable(struct dmub_psr *dmub, bool enable) +static void dmub_psr_enable(struct dmub_psr *dmub, bool enable, bool wait) { union dmub_rb_cmd cmd; struct dc_context *dc = dmub->ctx; + uint32_t retry_count, psr_state = 0; cmd.psr_enable.header.type = DMUB_CMD__PSR; @@ -136,6 +137,30 @@ static void dmub_psr_enable(struct dmub_psr *dmub, bool enable) dc_dmub_srv_cmd_queue(dc->dmub_srv, &cmd); dc_dmub_srv_cmd_execute(dc->dmub_srv); dc_dmub_srv_wait_idle(dc->dmub_srv); + + /* Below loops 1000 x 500us = 500 ms. + * Exit PSR may need to wait 1-2 frames to power up. Timeout after at + * least a few frames. Should never hit the max retry assert below. + */ + if (wait) { + for (retry_count = 0; retry_count <= 1000; retry_count++) { + dmub_psr_get_state(dmub, &psr_state); + + if (enable) { + if (psr_state != 0) + break; + } else { + if (psr_state == 0) + break; + } + + udelay(500); + } + + /* assert if max retry hit */ + if (retry_count >= 1000) + ASSERT(0); + } } /** diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.h b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.h index f404fecd6410..dc121ed92d2e 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.h +++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_psr.h @@ -36,7 +36,7 @@ struct dmub_psr { struct dmub_psr_funcs { bool (*psr_copy_settings)(struct dmub_psr *dmub, struct dc_link *link, struct psr_context *psr_context); - void (*psr_enable)(struct dmub_psr *dmub, bool enable); + void (*psr_enable)(struct dmub_psr *dmub, bool enable, bool wait); void (*psr_get_state)(struct dmub_psr *dmub, uint32_t *psr_state); void (*psr_set_level)(struct dmub_psr *dmub, uint16_t psr_level); }; |