diff options
| author | Nikola Cornij <nikola.cornij@amd.com> | 2019-10-16 21:34:15 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-11-13 23:29:43 +0300 |
| commit | a5132f9728dc7c310736b83422e93e0ad563a3b6 (patch) | |
| tree | 9eb9272363b577cd4b33d802859a00051e08983e /drivers | |
| parent | 4338ffa8df23d6665f53dd38da2e415940e3bf13 (diff) | |
| download | linux-a5132f9728dc7c310736b83422e93e0ad563a3b6.tar.xz | |
drm/amd/display: Add a sanity check for DSC already enabled/disabled
[why]
If acquire/release DSC resource sequence is affected by a regression,
it can happen that the already-in-use DSC HW block is being wrongly
re-used for a different pipe. The reverse is also possible, i.e.
already-disabled DSC HW block could be disabled from other context.
[how]
Read back the enable state of DSC HW and report an error if duplicate
enable or disable was attempted.
Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c index 63eb377ed9c0..dc9944427d2f 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c @@ -222,9 +222,18 @@ static bool dsc2_get_packed_pps(struct display_stream_compressor *dsc, const str static void dsc2_enable(struct display_stream_compressor *dsc, int opp_pipe) { struct dcn20_dsc *dsc20 = TO_DCN20_DSC(dsc); + int dsc_clock_en; + int dsc_fw_config; + int enabled_opp_pipe; - /* TODO Check if DSC alreay in use? */ - DC_LOG_DSC("enable DSC at opp pipe %d", opp_pipe); + DC_LOG_DSC("enable DSC %d at opp pipe %d", dsc->inst, opp_pipe); + + REG_GET(DSC_TOP_CONTROL, DSC_CLOCK_EN, &dsc_clock_en); + REG_GET_2(DSCRM_DSC_FORWARD_CONFIG, DSCRM_DSC_FORWARD_EN, &dsc_fw_config, DSCRM_DSC_OPP_PIPE_SOURCE, &enabled_opp_pipe); + if ((dsc_clock_en || dsc_fw_config) && enabled_opp_pipe != opp_pipe) { + DC_LOG_DSC("ERROR: DSC %d at opp pipe %d already enabled!", dsc->inst, enabled_opp_pipe); + ASSERT(0); + } REG_UPDATE(DSC_TOP_CONTROL, DSC_CLOCK_EN, 1); @@ -238,8 +247,18 @@ static void dsc2_enable(struct display_stream_compressor *dsc, int opp_pipe) static void dsc2_disable(struct display_stream_compressor *dsc) { struct dcn20_dsc *dsc20 = TO_DCN20_DSC(dsc); + int dsc_clock_en; + int dsc_fw_config; + int enabled_opp_pipe; - DC_LOG_DSC("disable DSC"); + DC_LOG_DSC("disable DSC %d", dsc->inst); + + REG_GET(DSC_TOP_CONTROL, DSC_CLOCK_EN, &dsc_clock_en); + REG_GET_2(DSCRM_DSC_FORWARD_CONFIG, DSCRM_DSC_FORWARD_EN, &dsc_fw_config, DSCRM_DSC_OPP_PIPE_SOURCE, &enabled_opp_pipe); + if (!dsc_clock_en || !dsc_fw_config) { + DC_LOG_DSC("ERROR: DSC %d at opp pipe %d already disabled!", dsc->inst, enabled_opp_pipe); + ASSERT(0); + } REG_UPDATE(DSCRM_DSC_FORWARD_CONFIG, DSCRM_DSC_FORWARD_EN, 0); |