From: Nicholas Kazlauskas Date: Thu, 5 Mar 2020 19:43:00 +0000 (-0500) Subject: drm/amd/display: Use double buffered DRR timing update by default X-Git-Tag: v5.10.7~2352^2~20^2~266 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8f43965f79ea7eabd2ea1a341670630ab4d0d70e;p=platform%2Fkernel%2Flinux-rpi.git drm/amd/display: Use double buffered DRR timing update by default [Why] For some monitors extreme flickering can occur while using LFC for if we're not doing the DRR timing update for V_TOTAL_MIN / V_TOTAL_MAX at the DP start of frame. Hardware can default to any time in the frame which isn't the behavior we want. [How] Add a new function for setting the double buffering mode for DRR timing. Default to DP start of frame double buffering on timing generator init. Signed-off-by: Nicholas Kazlauskas Reviewed-by: Aric Cyr Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c index 63acb8f..17d96ec6 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c @@ -343,6 +343,23 @@ void optc1_set_blank_data_double_buffer(struct timing_generator *optc, bool enab } /** + * optc1_set_timing_double_buffer() - DRR double buffering control + * + * Sets double buffer point for V_TOTAL, H_TOTAL, VTOTAL_MIN, + * VTOTAL_MAX, VTOTAL_MIN_SEL and VTOTAL_MAX_SEL registers. + * + * Options: any time, start of frame, dp start of frame (range timing) + */ +void optc1_set_timing_double_buffer(struct timing_generator *optc, bool enable) +{ + struct optc *optc1 = DCN10TG_FROM_TG(optc); + uint32_t mode = enable ? 2 : 0; + + REG_UPDATE(OTG_DOUBLE_BUFFER_CONTROL, + OTG_RANGE_TIMING_DBUF_UPDATE_MODE, mode); +} + +/** * unblank_crtc * Call ASIC Control Object to UnBlank CRTC. */ @@ -1353,6 +1370,7 @@ void optc1_clear_optc_underflow(struct timing_generator *optc) void optc1_tg_init(struct timing_generator *optc) { optc1_set_blank_data_double_buffer(optc, true); + optc1_set_timing_double_buffer(optc, true); optc1_clear_optc_underflow(optc); } diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h index f277656..9a459a8 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h @@ -185,6 +185,7 @@ struct dcn_optc_registers { SF(OTG0_OTG_GLOBAL_CONTROL0, OTG_MASTER_UPDATE_LOCK_SEL, mask_sh),\ SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_UPDATE_PENDING, mask_sh),\ SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_BLANK_DATA_DOUBLE_BUFFER_EN, mask_sh),\ + SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_RANGE_TIMING_DBUF_UPDATE_MODE, mask_sh),\ SF(OTG0_OTG_H_TOTAL, OTG_H_TOTAL, mask_sh),\ SF(OTG0_OTG_H_BLANK_START_END, OTG_H_BLANK_START, mask_sh),\ SF(OTG0_OTG_H_BLANK_START_END, OTG_H_BLANK_END, mask_sh),\ @@ -643,6 +644,8 @@ bool optc1_is_optc_underflow_occurred(struct timing_generator *optc); void optc1_set_blank_data_double_buffer(struct timing_generator *optc, bool enable); +void optc1_set_timing_double_buffer(struct timing_generator *optc, bool enable); + bool optc1_get_otg_active_size(struct timing_generator *optc, uint32_t *otg_active_width, uint32_t *otg_active_height);