[PATCH 19/20] drm/amd/display: Read default boot options

[Alex Hung]

From: Duncan Ma <duncan.ma at amd.com>

[WHY]
DPIA boot option is set by VBIOS. It gets
overwritten when driver loads DMU.

[HOW]
Read PreOS boot options and determine if
dpia is enabled.

Reviewed-by: Ovidiu Bunea <ovidiu.bunea at amd.com>
Acked-by: Alex Hung <alex.hung at amd.com>
Signed-off-by: Duncan Ma <duncan.ma at amd.com>
---
 drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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 70e63aeb8f89..7f53074f4e48 100644
--- a/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c
+++ b/drivers/gpu/drm/amd/display/dmub/src/dmub_dcn35.c
@@ -410,10 +410,13 @@ union dmub_fw_boot_options dmub_dcn35_get_fw_boot_option(struct dmub_srv *dmub)
 void dmub_dcn35_enable_dmub_boot_options(struct dmub_srv *dmub, const struct dmub_srv_hw_params *params)
 {
 	union dmub_fw_boot_options boot_options = {0};
+	union dmub_fw_boot_options cur_boot_options = {0};
+
+	cur_boot_options = dmub_dcn35_get_fw_boot_option(dmub);
 
 	boot_options.bits.z10_disable = params->disable_z10;
 	boot_options.bits.dpia_supported = params->dpia_supported;
-	boot_options.bits.enable_dpia = params->disable_dpia == true ? 0:1;
+	boot_options.bits.enable_dpia = cur_boot_options.bits.enable_dpia && !params->disable_dpia;
 	boot_options.bits.usb4_cm_version = params->usb4_cm_version;
 	boot_options.bits.dpia_hpd_int_enable_supported = params->dpia_hpd_int_enable_supported;
 	boot_options.bits.power_optimization = params->power_optimization;
-- 
2.34.1