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drm/amd/display: Add a sanity check for DSC already enabled/disabled

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[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>
This commit is contained in:
Nikola Cornij 2019-10-16 14:34:15 -04:00 committed by Alex Deucher
parent 4338ffa8df
commit a5132f9728
1 changed files with 22 additions and 3 deletions
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25
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dsc.c
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@ -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);