diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c index 5e3bcaf12cac..3e6d6ebd199e 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c +++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hubbub.c @@ -949,6 +949,65 @@ static void hubbub31_get_dchub_ref_freq(struct hubbub *hubbub, } } +static bool hubbub31_verify_allow_pstate_change_high(struct hubbub *hubbub) +{ + struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub); + + /* + * Pstate latency is ~20us so if we wait over 40us and pstate allow + * still not asserted, we are probably stuck and going to hang + */ + const unsigned int pstate_wait_timeout_us = 100; + const unsigned int pstate_wait_expected_timeout_us = 40; + + static unsigned int max_sampled_pstate_wait_us; /* data collection */ + static bool forced_pstate_allow; /* help with revert wa */ + + unsigned int debug_data = 0; + unsigned int i; + + if (forced_pstate_allow) { + /* we hacked to force pstate allow to prevent hang last time + * we verify_allow_pstate_change_high. so disable force + * here so we can check status + */ + REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL, + DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE, 0, + DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE, 0); + forced_pstate_allow = false; + } + + REG_WRITE(DCHUBBUB_TEST_DEBUG_INDEX, hubbub2->debug_test_index_pstate); + + for (i = 0; i < pstate_wait_timeout_us; i++) { + debug_data = REG_READ(DCHUBBUB_TEST_DEBUG_DATA); + + /* Debug bit is specific to ASIC. */ + if (debug_data & (1 << 26)) { + if (i > pstate_wait_expected_timeout_us) + DC_LOG_WARNING("pstate took longer than expected ~%dus\n", i); + return true; + } + if (max_sampled_pstate_wait_us < i) + max_sampled_pstate_wait_us = i; + + udelay(1); + } + + /* force pstate allow to prevent system hang + * and break to debugger to investigate + */ + REG_UPDATE_2(DCHUBBUB_ARB_DRAM_STATE_CNTL, + DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_VALUE, 1, + DCHUBBUB_ARB_ALLOW_PSTATE_CHANGE_FORCE_ENABLE, 1); + forced_pstate_allow = true; + + DC_LOG_WARNING("pstate TEST_DEBUG_DATA: 0x%X\n", + debug_data); + + return false; +} + static const struct hubbub_funcs hubbub31_funcs = { .update_dchub = hubbub2_update_dchub, .init_dchub_sys_ctx = hubbub31_init_dchub_sys_ctx, @@ -961,6 +1020,7 @@ static const struct hubbub_funcs hubbub31_funcs = { .program_watermarks = hubbub31_program_watermarks, .allow_self_refresh_control = hubbub1_allow_self_refresh_control, .is_allow_self_refresh_enabled = hubbub1_is_allow_self_refresh_enabled, + .verify_allow_pstate_change_high = hubbub31_verify_allow_pstate_change_high, .program_det_size = dcn31_program_det_size, .program_compbuf_size = dcn31_program_compbuf_size, .init_crb = dcn31_init_crb, |