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drm/amd/display: Implement workaround for writing to OTG_PIXEL_RATE_DIV register

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commit 74fa4c81aa 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>
This commit is contained in:
Saaem Rizvi 2023-03-06 15:10:13 -05:00 committed by Greg Kroah-Hartman
parent 8517d73992
commit 4bdfe20d85
5 changed files with 29 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.h
View File

@ -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)

22
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c
View File

@ -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();

3
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.h
View File

@ -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(

2
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
View File

@ -1177,7 +1177,7 @@ 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;

3
drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h
View File

@ -1272,7 +1272,8 @@ unsigned int dcn32_calc_num_avail_chans_for_mall(struct dc *dc, int num_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 */