From: Saaem Rizvi <SyedSaaem.Rizvi@xxxxxxx>
[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@xxxxxxx>
Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Signed-off-by: Saaem Rizvi <SyedSaaem.Rizvi@xxxxxxx>
---
.../gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h | 3 ++-
.../gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c | 22 +++++++++++++++++++
.../gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h | 3 ++-
.../drm/amd/display/dc/dcn32/dcn32_hwseq.c | 2 +-
.../drm/amd/display/dc/dcn32/dcn32_resource.h | 3 ++-
5 files changed, 29 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h
index 915a20461c77..893c0809cd4e 100644
--- 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)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
index e4472c6be6c3..5dbef498580b 100644
--- 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();
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h
index 271c163e4844..8071ab98d708 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h
@@ -111,7 +111,8 @@
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(
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
index f9073b722b36..5016b1313f3d 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
@@ -1111,7 +1111,7 @@ unsigned int dcn32_calculate_dccg_k1_k2_values(struct pipe_ctx *pipe_ctx, unsign
*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;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
index aca928edc4e3..10a3350376e4 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
@@ -1276,7 +1276,8 @@ double dcn32_determine_max_vratio_prefetch(struct dc *dc, struct dc_state *conte
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 */
--
2.34.1
