drm/amd/display: Add DCE BIOS_SCRATCH_0 register

The BIOS uses this register to write the results of the
DAC_LoadDetection command, so we'll need to read this
in order to make DAC load detection work.

As a reference, I used the mmBIOS_SCRATCH_0 definition from
the amdgpu legacy display code.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Timur Kristóf

drivers/gpu/drm/amd/display/dc/dc_bios_types.h

@@ -168,6 +168,7 @@ struct dc_vbios_funcs {
 };
 
 struct bios_registers {
+	uint32_t BIOS_SCRATCH_0;
 	uint32_t BIOS_SCRATCH_3;
 	uint32_t BIOS_SCRATCH_6;
 };

drivers/gpu/drm/amd/display/dc/resource/dce100/dce100_resource.c

@@ -78,6 +78,7 @@
 #endif
 
 #ifndef mmBIOS_SCRATCH_2
+	#define mmBIOS_SCRATCH_0 0x05C9
 	#define mmBIOS_SCRATCH_2 0x05CB
 	#define mmBIOS_SCRATCH_3 0x05CC
 	#define mmBIOS_SCRATCH_6 0x05CF
@@ -369,6 +370,7 @@ static const struct dce_abm_mask abm_mask = {
 #define DCFE_MEM_PWR_CTRL_REG_BASE 0x1b03
 
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0,
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3,
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6
 };

drivers/gpu/drm/amd/display/dc/resource/dce110/dce110_resource.c

@@ -82,6 +82,7 @@
 #endif
 
 #ifndef mmBIOS_SCRATCH_2
+	#define mmBIOS_SCRATCH_0 0x05C9
 	#define mmBIOS_SCRATCH_2 0x05CB
 	#define mmBIOS_SCRATCH_3 0x05CC
 	#define mmBIOS_SCRATCH_6 0x05CF
@@ -377,6 +378,7 @@ static const struct dce110_clk_src_mask cs_mask = {
 };
 
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0,
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3,
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6
 };

drivers/gpu/drm/amd/display/dc/resource/dce112/dce112_resource.c

@@ -76,6 +76,7 @@
 #endif
 
 #ifndef mmBIOS_SCRATCH_2
+	#define mmBIOS_SCRATCH_0 0x05C9
 	#define mmBIOS_SCRATCH_2 0x05CB
 	#define mmBIOS_SCRATCH_3 0x05CC
 	#define mmBIOS_SCRATCH_6 0x05CF
@@ -385,6 +386,7 @@ static const struct dce110_clk_src_mask cs_mask = {
 };
 
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0,
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3,
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6
 };

drivers/gpu/drm/amd/display/dc/resource/dce120/dce120_resource.c

@@ -491,6 +491,7 @@ static struct dce_i2c_hw *dce120_i2c_hw_create(
 	return dce_i2c_hw;
 }
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0 + NBIO_BASE(mmBIOS_SCRATCH_0_BASE_IDX),
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3 + NBIO_BASE(mmBIOS_SCRATCH_3_BASE_IDX),
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6 + NBIO_BASE(mmBIOS_SCRATCH_6_BASE_IDX)
 };

drivers/gpu/drm/amd/display/dc/resource/dce60/dce60_resource.c

@@ -80,6 +80,7 @@
 
 
 #ifndef mmBIOS_SCRATCH_2
+	#define mmBIOS_SCRATCH_0 0x05C9
 	#define mmBIOS_SCRATCH_2 0x05CB
 	#define mmBIOS_SCRATCH_3 0x05CC
 	#define mmBIOS_SCRATCH_6 0x05CF
@@ -368,6 +369,7 @@ static const struct dce110_clk_src_mask cs_mask = {
 };
 
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0,
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3,
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6
 };

drivers/gpu/drm/amd/display/dc/resource/dce80/dce80_resource.c

@@ -78,6 +78,7 @@
 
 
 #ifndef mmBIOS_SCRATCH_2
+	#define mmBIOS_SCRATCH_0 0x05C9
 	#define mmBIOS_SCRATCH_2 0x05CB
 	#define mmBIOS_SCRATCH_3 0x05CC
 	#define mmBIOS_SCRATCH_6 0x05CF
@@ -369,6 +370,7 @@ static const struct dce110_clk_src_mask cs_mask = {
 };
 
 static const struct bios_registers bios_regs = {
+	.BIOS_SCRATCH_0 = mmBIOS_SCRATCH_0,
 	.BIOS_SCRATCH_3 = mmBIOS_SCRATCH_3,
 	.BIOS_SCRATCH_6 = mmBIOS_SCRATCH_6
 };