From: Saaem Rizvi SyedSaaem.Rizvi@amd.com
commit 74fa4c81aadf418341f0d073c864ea7dca730a2e upstream.
[Why and How] Current implementation requires FPGA builds to take a different code path from DCN32 to write to OTG_PIXEL_RATE_DIV. Now that we have a workaround to write to OTG_PIXEL_RATE_DIV register without blanking display on hotplug on DCN32, we can allow the code paths for FPGA to be exactly the same allowing for more consistent testing.
Reviewed-by: Alvin Lee Alvin.Lee2@amd.com Acked-by: Qingqing Zhuo qingqing.zhuo@amd.com Signed-off-by: Saaem Rizvi SyedSaaem.Rizvi@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Cc: "Limonciello, Mario" mario.limonciello@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h | 3 +- drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c | 22 ++++++++++++++++++ drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h | 3 +- drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c | 2 - drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h | 3 +- 5 files changed, 29 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h @@ -230,7 +230,8 @@ type DTBCLK_P2_SRC_SEL;\ type DTBCLK_P2_EN;\ type DTBCLK_P3_SRC_SEL;\ - type DTBCLK_P3_EN; + type DTBCLK_P3_EN;\ + type DENTIST_DISPCLK_CHG_DONE;
struct dccg_shift { DCCG_REG_FIELD_LIST(uint8_t) --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c @@ -42,6 +42,20 @@ #define DC_LOGGER \ dccg->ctx->logger
+/* This function is a workaround for writing to OTG_PIXEL_RATE_DIV + * without the probability of causing a DIG FIFO error. + */ +static void dccg32_wait_for_dentist_change_done( + struct dccg *dccg) +{ + struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg); + + uint32_t dentist_dispclk_value = REG_READ(DENTIST_DISPCLK_CNTL); + + REG_WRITE(DENTIST_DISPCLK_CNTL, dentist_dispclk_value); + REG_WAIT(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_CHG_DONE, 1, 50, 2000); +} + static void dccg32_get_pixel_rate_div( struct dccg *dccg, uint32_t otg_inst, @@ -110,21 +124,29 @@ static void dccg32_set_pixel_rate_div( REG_UPDATE_2(OTG_PIXEL_RATE_DIV, OTG0_PIXEL_RATE_DIVK1, k1, OTG0_PIXEL_RATE_DIVK2, k2); + + dccg32_wait_for_dentist_change_done(dccg); break; case 1: REG_UPDATE_2(OTG_PIXEL_RATE_DIV, OTG1_PIXEL_RATE_DIVK1, k1, OTG1_PIXEL_RATE_DIVK2, k2); + + dccg32_wait_for_dentist_change_done(dccg); break; case 2: REG_UPDATE_2(OTG_PIXEL_RATE_DIV, OTG2_PIXEL_RATE_DIVK1, k1, OTG2_PIXEL_RATE_DIVK2, k2); + + dccg32_wait_for_dentist_change_done(dccg); break; case 3: REG_UPDATE_2(OTG_PIXEL_RATE_DIV, OTG3_PIXEL_RATE_DIVK1, k1, OTG3_PIXEL_RATE_DIVK2, k2); + + dccg32_wait_for_dentist_change_done(dccg); break; default: BREAK_TO_DEBUGGER(); --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h @@ -147,7 +147,8 @@ DCCG_SF(DTBCLK_P_CNTL, DTBCLK_P3_SRC_SEL, mask_sh),\ DCCG_SF(DTBCLK_P_CNTL, DTBCLK_P3_EN, mask_sh),\ DCCG_SF(DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO_SEL, mask_sh),\ - DCCG_SF(DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO0_SOURCE_SEL, mask_sh) + DCCG_SF(DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO0_SOURCE_SEL, mask_sh),\ + DCCG_SF(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_CHG_DONE, mask_sh)
struct dccg *dccg32_create( --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c @@ -1177,7 +1177,7 @@ unsigned int dcn32_calculate_dccg_k1_k2_ *k2_div = PIXEL_RATE_DIV_BY_2; else *k2_div = PIXEL_RATE_DIV_BY_4; - } else if (dc_is_dp_signal(stream->signal)) { + } else if (dc_is_dp_signal(stream->signal) || dc_is_virtual_signal(stream->signal)) { if (two_pix_per_container) { *k1_div = PIXEL_RATE_DIV_BY_1; *k2_div = PIXEL_RATE_DIV_BY_2; --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h @@ -1272,7 +1272,8 @@ unsigned int dcn32_calc_num_avail_chans_ DCCG_SRII(PHASE, DTBCLK_DTO, 0), DCCG_SRII(PHASE, DTBCLK_DTO, 1), \ DCCG_SRII(PHASE, DTBCLK_DTO, 2), DCCG_SRII(PHASE, DTBCLK_DTO, 3), \ SR(DCCG_AUDIO_DTBCLK_DTO_MODULO), SR(DCCG_AUDIO_DTBCLK_DTO_PHASE), \ - SR(OTG_PIXEL_RATE_DIV), SR(DTBCLK_P_CNTL), SR(DCCG_AUDIO_DTO_SOURCE) \ + SR(OTG_PIXEL_RATE_DIV), SR(DTBCLK_P_CNTL), \ + SR(DCCG_AUDIO_DTO_SOURCE), SR(DENTIST_DISPCLK_CNTL) \ )
/* VMID */