From: Hansen Dsouza <Hansen.Dsouza@xxxxxxx>
[Why]
Spread on DPREFCLK by 0.3 percent can have a negative effect on sink
when PHY SSC is also spread by 0.3 percent
[How]
Add boot option for DMU to lower PHY SSC
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Signed-off-by: Hansen Dsouza <Hansen.Dsouza@xxxxxxx>
Signed-off-by: Tom Chung <chiahsuan.chung@xxxxxxx>
---
drivers/gpu/drm/amd/display/dmub/dmub_srv.h | 1 +
drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h | 3 ++-
drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c | 1 +
3 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
index ff27229cc3a4..b353c4ceb60d 100644
--- a/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
+++ b/drivers/gpu/drm/amd/display/dmub/dmub_srv.h
@@ -301,6 +301,7 @@ struct dmub_srv_hw_params {
bool disallow_phy_access;
bool disable_sldo_opt;
bool enable_non_transparent_setconfig;
+ bool lower_hbr3_phy_ssc;
};
/**
diff --git a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
index 6edd3d34c7b5..6d96a840d24d 100644
--- a/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
+++ b/drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h
@@ -694,7 +694,8 @@ union dmub_fw_boot_options {
uint32_t ips_disable: 3; /* options to disable ips support*/
uint32_t ips_sequential_ono: 1; /**< 1 to enable sequential ONO IPS sequence */
uint32_t disable_sldo_opt: 1; /**< 1 to disable SLDO optimizations */
- uint32_t reserved : 7; /**< reserved */
+ uint32_t lower_hbr3_phy_ssc: 1; /**< 1 to lower hbr3 phy ssc to 0.125 percent */
+ uint32_t reserved : 6; /**< reserved */
} bits; /**< boot bits */
uint32_t all; /**< 32-bit access to bits */
};
diff --git a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c
index 2ccad79053c5..3be315f1a443 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c
@@ -426,6 +426,7 @@ void dmub_dcn35_enable_dmub_boot_options(struct dmub_srv *dmub, const struct dmu
boot_options.bits.ips_sequential_ono = params->ips_sequential_ono;
boot_options.bits.disable_sldo_opt = params->disable_sldo_opt;
boot_options.bits.enable_non_transparent_setconfig = params->enable_non_transparent_setconfig;
+ boot_options.bits.lower_hbr3_phy_ssc = params->lower_hbr3_phy_ssc;
REG_WRITE(DMCUB_SCRATCH14, boot_options.all);
}
--
2.34.1
