drm/amd/display: Refactor reg_set and reg_update.

[Why]
Current reg update and reg set use same functions and
only delta is update reads reg value and call update function.

[How]
Refactor reg update and reg set functions.
1.Implement different functions for reg update and reg set.
2.Wrap same process to a help function, both reg update and
reg set will call it.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_helper.c

@@ -51,20 +51,16 @@ static inline void set_reg_field_value_masks(
 	field_value_mask->mask = field_value_mask->mask | mask;
 }
 
-uint32_t generic_reg_update_ex(const struct dc_context *ctx,
+static void set_reg_field_values(struct dc_reg_value_masks *field_value_mask,
-		uint32_t addr, uint32_t reg_val, int n,
+		uint32_t addr, int n,
 		uint8_t shift1, uint32_t mask1, uint32_t field_value1,
-		...)
+		va_list ap)
 {
-	struct dc_reg_value_masks field_value_mask = {0};
 	uint32_t shift, mask, field_value;
 	int i = 1;
 
-	va_list ap;
-	va_start(ap, field_value1);
-
 	/* gather all bits value/mask getting updated in this register */
-	set_reg_field_value_masks(&field_value_mask,
+	set_reg_field_value_masks(field_value_mask,
 			field_value1, mask1, shift1);
 
 	while (i < n) {
@@ -72,10 +68,48 @@ uint32_t generic_reg_update_ex(const struct dc_context *ctx,
 		mask = va_arg(ap, uint32_t);
 		field_value = va_arg(ap, uint32_t);
 
-		set_reg_field_value_masks(&field_value_mask,
+		set_reg_field_value_masks(field_value_mask,
 				field_value, mask, shift);
 		i++;
 	}
+}
+
+uint32_t generic_reg_update_ex(const struct dc_context *ctx,
+		uint32_t addr, int n,
+		uint8_t shift1, uint32_t mask1, uint32_t field_value1,
+		...)
+{
+	struct dc_reg_value_masks field_value_mask = {0};
+	uint32_t reg_val;
+	va_list ap;
+
+	va_start(ap, field_value1);
+
+	set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
+			field_value1, ap);
+
+	va_end(ap);
+
+	/* mmio write directly */
+	reg_val = dm_read_reg(ctx, addr);
+	reg_val = (reg_val & ~field_value_mask.mask) | field_value_mask.value;
+	dm_write_reg(ctx, addr, reg_val);
+	return reg_val;
+}
+
+uint32_t generic_reg_set_ex(const struct dc_context *ctx,
+		uint32_t addr, uint32_t reg_val, int n,
+		uint8_t shift1, uint32_t mask1, uint32_t field_value1,
+		...)
+{
+	struct dc_reg_value_masks field_value_mask = {0};
+	va_list ap;
+
+	va_start(ap, field_value1);
+
+	set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
+			field_value1, ap);
+
 	va_end(ap);
 
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c

@@ -1304,7 +1304,6 @@ void dcn10_link_encoder_connect_dig_be_to_fe(
 #define HPD_REG_UPDATE_N(reg_name, n, ...)	\
 		generic_reg_update_ex(CTX, \
 				HPD_REG(reg_name), \
-				HPD_REG_READ(reg_name), \
 				n, __VA_ARGS__)
 
 #define HPD_REG_UPDATE(reg_name, field, val)	\
@@ -1337,7 +1336,6 @@ void dcn10_link_encoder_disable_hpd(struct link_encoder *enc)
 #define AUX_REG_UPDATE_N(reg_name, n, ...)	\
 		generic_reg_update_ex(CTX, \
 				AUX_REG(reg_name), \
-				AUX_REG_READ(reg_name), \
 				n, __VA_ARGS__)
 
 #define AUX_REG_UPDATE(reg_name, field, val)	\

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

@@ -144,10 +144,14 @@ static inline uint32_t set_reg_field_value_ex(
 		reg_name ## __ ## reg_field ## _MASK,\
 		reg_name ## __ ## reg_field ## __SHIFT)
 
-uint32_t generic_reg_update_ex(const struct dc_context *ctx,
+uint32_t generic_reg_set_ex(const struct dc_context *ctx,
 		uint32_t addr, uint32_t reg_val, int n,
 		uint8_t shift1, uint32_t mask1, uint32_t field_value1, ...);
 
+uint32_t generic_reg_update_ex(const struct dc_context *ctx,
+		uint32_t addr, int n,
+		uint8_t shift1, uint32_t mask1, uint32_t field_value1, ...);
+
 #define FD(reg_field)	reg_field ## __SHIFT, \
 						reg_field ## _MASK
 
@@ -172,11 +176,10 @@ unsigned int generic_reg_wait(const struct dc_context *ctx,
 
 #define generic_reg_update_soc15(ctx, inst_offset, reg_name, n, ...)\
 		generic_reg_update_ex(ctx, DCE_BASE.instance[0].segment[mm##reg_name##_BASE_IDX] +  mm##reg_name + inst_offset, \
-		dm_read_reg_func(ctx, mm##reg_name + DCE_BASE.instance[0].segment[mm##reg_name##_BASE_IDX] + inst_offset, __func__), \
 		n, __VA_ARGS__)
 
 #define generic_reg_set_soc15(ctx, inst_offset, reg_name, n, ...)\
-		generic_reg_update_ex(ctx, DCE_BASE.instance[0].segment[mm##reg_name##_BASE_IDX] + mm##reg_name + inst_offset, 0, \
+		generic_reg_set_ex(ctx, DCE_BASE.instance[0].segment[mm##reg_name##_BASE_IDX] + mm##reg_name + inst_offset, 0, \
 		n, __VA_ARGS__)
 
 #define get_reg_field_value_soc15(reg_value, block, reg_num, reg_name, reg_field)\

drivers/gpu/drm/amd/display/dc/inc/reg_helper.h

@@ -52,7 +52,7 @@
 
 /* macro to set register fields. */
 #define REG_SET_N(reg_name, n, initial_val, ...)	\
-		generic_reg_update_ex(CTX, \
+		generic_reg_set_ex(CTX, \
 				REG(reg_name), \
 				initial_val, \
 				n, __VA_ARGS__)
@@ -225,7 +225,6 @@
 #define REG_UPDATE_N(reg_name, n, ...)	\
 		generic_reg_update_ex(CTX, \
 				REG(reg_name), \
-				REG_READ(reg_name), \
 				n, __VA_ARGS__)
 
 #define REG_UPDATE(reg_name, field, val)	\