drm/amd/display: change generic_reg_wait to void.

we were only checking the return value in one place, thus changing
generic_reg_wait from int to void and reading the register instead of
getting it from generic_reg_wait, when we need the return value.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -269,7 +269,7 @@ uint32_t generic_reg_get(const struct dc_context *ctx,
 }
 */
 
-uint32_t generic_reg_wait(const struct dc_context *ctx,
+void generic_reg_wait(const struct dc_context *ctx,
 	uint32_t addr, uint32_t shift, uint32_t mask, uint32_t condition_value,
 	unsigned int delay_between_poll_us, unsigned int time_out_num_tries,
 	const char *func_name, int line)
@@ -299,7 +299,7 @@ uint32_t generic_reg_wait(const struct dc_context *ctx,
 				DC_LOG_DC("REG_WAIT taking a while: %dms in %s line:%d\n",
 						delay_between_poll_us * i / 1000,
 						func_name, line);
-			return reg_val;
+			return;
 		}
 	}
 
@@ -309,8 +309,6 @@ uint32_t generic_reg_wait(const struct dc_context *ctx,
 
 	if (!IS_FPGA_MAXIMUS_DC(ctx->dce_environment))
 		BREAK_TO_DEBUGGER();
-
-	return reg_val;
 }
 
 void generic_write_indirect_reg(const struct dc_context *ctx,

drivers/gpu/drm/amd/display/dc/dce/dce_aux.c

@@ -317,9 +317,10 @@ static enum aux_channel_operation_result get_channel_status(
 	*returned_bytes = 0;
 
 	/* poll to make sure that SW_DONE is asserted */
-	value = REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1,
+	REG_WAIT(AUX_SW_STATUS, AUX_SW_DONE, 1,
 				10, aux110->timeout_period/10);
 
+	value = REG_READ(AUX_SW_STATUS);
 	/* in case HPD is LOW, exit AUX transaction */
 	if ((value & AUX_SW_STATUS__AUX_SW_HPD_DISCON_MASK))
 		return AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON;

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

@@ -159,7 +159,7 @@ uint32_t generic_reg_update_ex(const struct dc_context *ctx,
  * return number of poll before condition is met
  * return 0 if condition is not meet after specified time out tries
  */
-unsigned int generic_reg_wait(const struct dc_context *ctx,
+void generic_reg_wait(const struct dc_context *ctx,
 	uint32_t addr, uint32_t mask, uint32_t shift, uint32_t condition_value,
 	unsigned int delay_between_poll_us, unsigned int time_out_num_tries,
 	const char *func_name, int line);