From 423ef48d41cbcfd5ee2039085d59e1f29b020ef4 Mon Sep 17 00:00:00 2001 From: Dillon Varone Date: Tue, 30 Sep 2025 12:17:13 -0400 Subject: [PATCH] drm/amd/display: Fix DMUB reset sequence for DCN32 [WHY&HOW] Backport reset sequence fixes implemented on DCN401 to DCN32 to address stability issues when resetting the DMUB. Reviewed-by: Nicholas Kazlauskas Signed-off-by: Dillon Varone Signed-off-by: Wayne Lin Tested-by: Dan Wheeler Signed-off-by: Alex Deucher --- .../gpu/drm/amd/display/dmub/src/dmub_dcn32.c | 50 ++++++++++++------- .../drm/amd/display/dmub/src/dmub_dcn401.c | 17 +++++-- 2 files changed, 45 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c index ce041f6239dc7..7e98562899108 100644 --- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c +++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn32.c @@ -89,50 +89,58 @@ static inline void dmub_dcn32_translate_addr(const union dmub_addr *addr_in, void dmub_dcn32_reset(struct dmub_srv *dmub) { union dmub_gpint_data_register cmd; - const uint32_t timeout = 100000; - uint32_t in_reset, is_enabled, scratch, i, pwait_mode; + const uint32_t timeout_us = 1 * 1000 * 1000; //1s + const uint32_t poll_delay_us = 1; //1us + uint32_t i = 0; + uint32_t enabled, in_reset, scratch, pwait_mode; - REG_GET(DMCUB_CNTL2, DMCUB_SOFT_RESET, &in_reset); - REG_GET(DMCUB_CNTL, DMCUB_ENABLE, &is_enabled); + REG_GET(DMCUB_CNTL, + DMCUB_ENABLE, &enabled); + REG_GET(DMCUB_CNTL2, + DMCUB_SOFT_RESET, &in_reset); - if (in_reset == 0 && is_enabled != 0) { + if (enabled && in_reset == 0) { cmd.bits.status = 1; cmd.bits.command_code = DMUB_GPINT__STOP_FW; cmd.bits.param = 0; dmub->hw_funcs.set_gpint(dmub, cmd); - for (i = 0; i < timeout; ++i) { - if (dmub->hw_funcs.is_gpint_acked(dmub, cmd)) - break; - - udelay(1); - } - - for (i = 0; i < timeout; ++i) { + for (; i < timeout_us; i++) { scratch = REG_READ(DMCUB_SCRATCH7); if (scratch == DMUB_GPINT__STOP_FW_RESPONSE) break; - udelay(1); + udelay(poll_delay_us); } - for (i = 0; i < timeout; ++i) { + for (; i < timeout_us; i++) { REG_GET(DMCUB_CNTL, DMCUB_PWAIT_MODE_STATUS, &pwait_mode); if (pwait_mode & (1 << 0)) break; - udelay(1); + udelay(poll_delay_us); } - /* Force reset in case we timed out, DMCUB is likely hung. */ } - if (is_enabled) { + if (enabled) { REG_UPDATE(DMCUB_CNTL2, DMCUB_SOFT_RESET, 1); udelay(1); REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); } + if (i >= timeout_us) { + /* timeout should never occur */ + BREAK_TO_DEBUGGER(); + } + + REG_UPDATE(DMCUB_REGION3_CW2_TOP_ADDRESS, DMCUB_REGION3_CW2_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW3_TOP_ADDRESS, DMCUB_REGION3_CW3_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW4_TOP_ADDRESS, DMCUB_REGION3_CW4_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW5_TOP_ADDRESS, DMCUB_REGION3_CW5_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW6_TOP_ADDRESS, DMCUB_REGION3_CW6_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW7_TOP_ADDRESS, DMCUB_REGION3_CW7_ENABLE, 0); + REG_WRITE(DMCUB_INBOX1_RPTR, 0); REG_WRITE(DMCUB_INBOX1_WPTR, 0); REG_WRITE(DMCUB_OUTBOX1_RPTR, 0); @@ -141,7 +149,7 @@ void dmub_dcn32_reset(struct dmub_srv *dmub) REG_WRITE(DMCUB_OUTBOX0_WPTR, 0); REG_WRITE(DMCUB_SCRATCH0, 0); - /* Clear the GPINT command manually so we don't send anything during boot. */ + /* Clear the GPINT command manually so we don't reset again. */ cmd.all = 0; dmub->hw_funcs.set_gpint(dmub, cmd); } @@ -163,7 +171,9 @@ void dmub_dcn32_backdoor_load(struct dmub_srv *dmub, dmub_dcn32_get_fb_base_offset(dmub, &fb_base, &fb_offset); + /* reset and disable DMCUB and MMHUBBUB DMUIF */ REG_UPDATE(DMCUB_SEC_CNTL, DMCUB_SEC_RESET, 1); + REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); dmub_dcn32_translate_addr(&cw0->offset, fb_base, fb_offset, &offset); @@ -193,7 +203,9 @@ void dmub_dcn32_backdoor_load_zfb_mode(struct dmub_srv *dmub, { union dmub_addr offset; + /* reset and disable DMCUB and MMHUBBUB DMUIF */ REG_UPDATE(DMCUB_SEC_CNTL, DMCUB_SEC_RESET, 1); + REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); offset = cw0->offset; diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn401.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn401.c index b31adbd0d685f..95542299e3b38 100644 --- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn401.c +++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn401.c @@ -81,7 +81,7 @@ void dmub_dcn401_reset(struct dmub_srv *dmub) dmub->hw_funcs.set_gpint(dmub, cmd); for (; i < timeout_us; i++) { - scratch = dmub->hw_funcs.get_gpint_response(dmub); + scratch = REG_READ(DMCUB_SCRATCH7); if (scratch == DMUB_GPINT__STOP_FW_RESPONSE) break; @@ -97,11 +97,24 @@ void dmub_dcn401_reset(struct dmub_srv *dmub) } } + if (enabled) { + REG_UPDATE(DMCUB_CNTL2, DMCUB_SOFT_RESET, 1); + udelay(1); + REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); + } + if (i >= timeout_us) { /* timeout should never occur */ BREAK_TO_DEBUGGER(); } + REG_UPDATE(DMCUB_REGION3_CW2_TOP_ADDRESS, DMCUB_REGION3_CW2_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW3_TOP_ADDRESS, DMCUB_REGION3_CW3_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW4_TOP_ADDRESS, DMCUB_REGION3_CW4_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW5_TOP_ADDRESS, DMCUB_REGION3_CW5_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW6_TOP_ADDRESS, DMCUB_REGION3_CW6_ENABLE, 0); + REG_UPDATE(DMCUB_REGION3_CW7_TOP_ADDRESS, DMCUB_REGION3_CW7_ENABLE, 0); + REG_WRITE(DMCUB_INBOX1_RPTR, 0); REG_WRITE(DMCUB_INBOX1_WPTR, 0); REG_WRITE(DMCUB_OUTBOX1_RPTR, 0); @@ -134,7 +147,6 @@ void dmub_dcn401_backdoor_load(struct dmub_srv *dmub, /* reset and disable DMCUB and MMHUBBUB DMUIF */ REG_UPDATE(DMCUB_SEC_CNTL, DMCUB_SEC_RESET, 1); - REG_UPDATE(MMHUBBUB_SOFT_RESET, DMUIF_SOFT_RESET, 1); REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); dmub_dcn401_translate_addr(&cw0->offset, fb_base, fb_offset, &offset); @@ -168,7 +180,6 @@ void dmub_dcn401_backdoor_load_zfb_mode(struct dmub_srv *dmub, /* reset and disable DMCUB and MMHUBBUB DMUIF */ REG_UPDATE(DMCUB_SEC_CNTL, DMCUB_SEC_RESET, 1); - REG_UPDATE(MMHUBBUB_SOFT_RESET, DMUIF_SOFT_RESET, 1); REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0); offset = cw0->offset; -- 2.47.3