From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com

[Why] DPP Root clock optimization when combined with 4to1 MPC combine results in the screen turning black.

This is because the DPPCLK is stopped during the middle of an optimize_bandwidth sequence during commit_minimal_transition without going through plane power down/power up.

[How] The intent of a 0Hz DPP clock through update_clocks is to disable the DTO. This differs from the behavior of stopping the DPPCLK entirely (utilizing a 0Hz clock on some ASIC) so it's better to move this logic to reside next to plane power up/power down where we gate the HUBP/DPP DOMAIN.

The new sequence should be: Power down: PG enabled -> RCO on Power up: RCO off -> PG disabled

Rename power_on_plane to power_on_plane_resources to reflect the actual operation that's occurring.

Cc: stable@vger.kernel.org Cc: Mario Limonciello mario.limonciello@amd.com Reviewed-by: Jun Lei Jun.Lei@amd.com Acked-by: Qingqing Zhuo qingqing.zhuo@amd.com Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com --- .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 12 ++++++-- .../drm/amd/display/dc/dcn20/dcn20_hwseq.c | 8 ++++-- .../gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c | 13 ++------- .../drm/amd/display/dc/dcn314/dcn314_dccg.c | 23 +++++++++++++++ .../drm/amd/display/dc/dcn314/dcn314_hwseq.c | 10 +++++++ .../drm/amd/display/dc/dcn314/dcn314_hwseq.h | 2 ++ .../drm/amd/display/dc/dcn314/dcn314_init.c | 1 + drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h | 28 +++++++++++-------- .../amd/display/dc/inc/hw_sequencer_private.h | 4 +++ 9 files changed, 74 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c index 46ca88741cb8..1c3b6f25a782 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -726,11 +726,15 @@ void dcn10_hubp_pg_control( } }

-static void power_on_plane( +static void power_on_plane_resources( struct dce_hwseq *hws, int plane_id) { DC_LOGGER_INIT(hws->ctx->logger); + + if (hws->funcs.dpp_root_clock_control) + hws->funcs.dpp_root_clock_control(hws, plane_id, true); + if (REG(DC_IP_REQUEST_CNTL)) { REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 1); @@ -1237,11 +1241,15 @@ void dcn10_plane_atomic_power_down(struct dc *dc, hws->funcs.hubp_pg_control(hws, hubp->inst, false);

dpp->funcs->dpp_reset(dpp); + REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 0); DC_LOG_DEBUG( "Power gated front end %d\n", hubp->inst); } + + if (hws->funcs.dpp_root_clock_control) + hws->funcs.dpp_root_clock_control(hws, dpp->inst, false); }

/* disable HW used by plane. @@ -2462,7 +2470,7 @@ static void dcn10_enable_plane(

undo_DEGVIDCN10_253_wa(dc);

- power_on_plane(dc->hwseq, + power_on_plane_resources(dc->hwseq, pipe_ctx->plane_res.hubp->inst);

/* enable DCFCLK current DCHUB */ diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index 69ea1f4ea749..9ca162ea0d07 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -1130,11 +1130,15 @@ void dcn20_blank_pixel_data( }

-static void dcn20_power_on_plane( +static void dcn20_power_on_plane_resources( struct dce_hwseq *hws, struct pipe_ctx *pipe_ctx) { DC_LOGGER_INIT(hws->ctx->logger); + + if (hws->funcs.dpp_root_clock_control) + hws->funcs.dpp_root_clock_control(hws, pipe_ctx->plane_res.dpp->inst, true); + if (REG(DC_IP_REQUEST_CNTL)) { REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 1); @@ -1158,7 +1162,7 @@ static void dcn20_enable_plane(struct dc *dc, struct pipe_ctx *pipe_ctx, //if (dc->debug.sanity_checks) { // dcn10_verify_allow_pstate_change_high(dc); //} - dcn20_power_on_plane(dc->hwseq, pipe_ctx); + dcn20_power_on_plane_resources(dc->hwseq, pipe_ctx);

/* enable DCFCLK current DCHUB */ pipe_ctx->plane_res.hubp->funcs->hubp_clk_cntl(pipe_ctx->plane_res.hubp, true); diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c index 7f34418e6308..7d2b982506fd 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_dccg.c @@ -66,17 +66,8 @@ void dccg31_update_dpp_dto(struct dccg *dccg, int dpp_inst, int req_dppclk) REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_ENABLE[dpp_inst], 1); } else { - //DTO must be enabled to generate a 0Hz clock output - if (dccg->ctx->dc->debug.root_clock_optimization.bits.dpp) { - REG_UPDATE(DPPCLK_DTO_CTRL, - DPPCLK_DTO_ENABLE[dpp_inst], 1); - REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0, - DPPCLK0_DTO_PHASE, 0, - DPPCLK0_DTO_MODULO, 1); - } else { - REG_UPDATE(DPPCLK_DTO_CTRL, - DPPCLK_DTO_ENABLE[dpp_inst], 0); - } + REG_UPDATE(DPPCLK_DTO_CTRL, + DPPCLK_DTO_ENABLE[dpp_inst], 0); } dccg->pipe_dppclk_khz[dpp_inst] = req_dppclk; } diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c index 0b769ee71405..081ce168f621 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_dccg.c @@ -289,8 +289,31 @@ static void dccg314_set_valid_pixel_rate( dccg314_set_dtbclk_dto(dccg, &dto_params); }

+static void dccg314_dpp_root_clock_control( + struct dccg *dccg, + unsigned int dpp_inst, + bool clock_on) +{ + struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg); + + if (clock_on) { + /* turn off the DTO and leave phase/modulo at max */ + REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_ENABLE[dpp_inst], 0); + REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0, + DPPCLK0_DTO_PHASE, 0xFF, + DPPCLK0_DTO_MODULO, 0xFF); + } else { + /* turn on the DTO to generate a 0hz clock */ + REG_UPDATE(DPPCLK_DTO_CTRL, DPPCLK_DTO_ENABLE[dpp_inst], 1); + REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0, + DPPCLK0_DTO_PHASE, 0, + DPPCLK0_DTO_MODULO, 1); + } +} + static const struct dccg_funcs dccg314_funcs = { .update_dpp_dto = dccg31_update_dpp_dto, + .dpp_root_clock_control = dccg314_dpp_root_clock_control, .get_dccg_ref_freq = dccg31_get_dccg_ref_freq, .dccg_init = dccg31_init, .set_dpstreamclk = dccg314_set_dpstreamclk, diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c index bcc03426fc3e..40c488b26901 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c @@ -390,6 +390,16 @@ void dcn314_set_pixels_per_cycle(struct pipe_ctx *pipe_ctx) pix_per_cycle); }

+void dcn314_dpp_root_clock_control(struct dce_hwseq *hws, unsigned int dpp_inst, bool clock_on) +{ + if (!hws->ctx->dc->debug.root_clock_optimization.bits.dpp) + return; + + if (hws->ctx->dc->res_pool->dccg->funcs->dpp_root_clock_control) + hws->ctx->dc->res_pool->dccg->funcs->dpp_root_clock_control( + hws->ctx->dc->res_pool->dccg, dpp_inst, clock_on); +} + void dcn314_hubp_pg_control(struct dce_hwseq *hws, unsigned int hubp_inst, bool power_on) { struct dc_context *ctx = hws->ctx; diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.h b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.h index c419d3dbdfee..c786d5e6a428 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.h +++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.h @@ -43,4 +43,6 @@ void dcn314_set_pixels_per_cycle(struct pipe_ctx *pipe_ctx);

void dcn314_hubp_pg_control(struct dce_hwseq *hws, unsigned int hubp_inst, bool power_on);

+void dcn314_dpp_root_clock_control(struct dce_hwseq *hws, unsigned int dpp_inst, bool clock_on); + #endif /* __DC_HWSS_DCN314_H__ */ diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_init.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_init.c index 343f4d9dd5e3..5267e901a35c 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_init.c +++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_init.c @@ -137,6 +137,7 @@ static const struct hwseq_private_funcs dcn314_private_funcs = { .plane_atomic_disable = dcn20_plane_atomic_disable, .plane_atomic_power_down = dcn10_plane_atomic_power_down, .enable_power_gating_plane = dcn314_enable_power_gating_plane, + .dpp_root_clock_control = dcn314_dpp_root_clock_control, .hubp_pg_control = dcn314_hubp_pg_control, .program_all_writeback_pipes_in_tree = dcn30_program_all_writeback_pipes_in_tree, .update_odm = dcn314_update_odm, diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h index ce006762f257..09de03699cc2 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h +++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dccg.h @@ -148,18 +148,22 @@ struct dccg_funcs { struct dccg *dccg, int inst);

-void (*set_pixel_rate_div)( - struct dccg *dccg, - uint32_t otg_inst, - enum pixel_rate_div k1, - enum pixel_rate_div k2); - -void (*set_valid_pixel_rate)( - struct dccg *dccg, - int ref_dtbclk_khz, - int otg_inst, - int pixclk_khz); - + void (*set_pixel_rate_div)( + struct dccg *dccg, + uint32_t otg_inst, + enum pixel_rate_div k1, + enum pixel_rate_div k2); + + void (*set_valid_pixel_rate)( + struct dccg *dccg, + int ref_dtbclk_khz, + int otg_inst, + int pixclk_khz); + + void (*dpp_root_clock_control)( + struct dccg *dccg, + unsigned int dpp_inst, + bool clock_on); };

#endif //__DAL_DCCG_H__ diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer_private.h b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer_private.h index 45d37c584551..5f63b67975cf 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer_private.h +++ b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer_private.h @@ -115,6 +115,10 @@ struct hwseq_private_funcs { void (*plane_atomic_disable)(struct dc *dc, struct pipe_ctx *pipe_ctx); void (*enable_power_gating_plane)(struct dce_hwseq *hws, bool enable); + void (*dpp_root_clock_control)( + struct dce_hwseq *hws, + unsigned int dpp_inst, + bool clock_on); void (*dpp_pg_control)(struct dce_hwseq *hws, unsigned int dpp_inst, bool power_on);