drm/amd/display: Clean up flip pending timeout handling

[Why]
Adjust timeout handling code for easier runtime manipulation
during debug. Change has no functional effect by default.
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Joshua Aberback <joshua.aberback@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -1269,20 +1269,21 @@ void dcn20_pipe_control_lock(
 	}
 
 	if (flip_immediate && lock) {
-		const int TIMEOUT_FOR_FLIP_PENDING = 100000;
+		const int TIMEOUT_FOR_FLIP_PENDING_US = 100000;
+		unsigned int polling_interval_us = 1;
 		int i;
 
 		temp_pipe = pipe;
 		while (temp_pipe) {
 			if (temp_pipe->plane_state && temp_pipe->plane_state->flip_immediate) {
-				for (i = 0; i < TIMEOUT_FOR_FLIP_PENDING; ++i) {
+				for (i = 0; i < TIMEOUT_FOR_FLIP_PENDING_US / polling_interval_us; ++i) {
 					if (!temp_pipe->plane_res.hubp->funcs->hubp_is_flip_pending(temp_pipe->plane_res.hubp))
 						break;
-					udelay(1);
+					udelay(polling_interval_us);
 				}
 
 				/* no reason it should take this long for immediate flips */
-				ASSERT(i != TIMEOUT_FOR_FLIP_PENDING);
+				ASSERT(i != TIMEOUT_FOR_FLIP_PENDING_US);
 			}
 			temp_pipe = temp_pipe->bottom_pipe;
 		}
@@ -1952,7 +1953,8 @@ void dcn20_post_unlock_program_front_end(
 		struct dc_state *context)
 {
 	int i;
-	const unsigned int TIMEOUT_FOR_PIPE_ENABLE_MS = 100;
+	const unsigned int TIMEOUT_FOR_PIPE_ENABLE_US = 100000;
+	unsigned int polling_interval_us = 1;
 	struct dce_hwseq *hwseq = dc->hwseq;
 
 	DC_LOGGER_INIT(dc->ctx->logger);
@@ -1974,10 +1976,9 @@ void dcn20_post_unlock_program_front_end(
 				pipe->stream->mall_stream_config.type != SUBVP_PHANTOM) {
 			struct hubp *hubp = pipe->plane_res.hubp;
 			int j = 0;
-
-			for (j = 0; j < TIMEOUT_FOR_PIPE_ENABLE_MS*1000
+			for (j = 0; j < TIMEOUT_FOR_PIPE_ENABLE_US / polling_interval_us
 					&& hubp->funcs->hubp_is_flip_pending(hubp); j++)
-				udelay(1);
+				udelay(polling_interval_us);
 		}
 	}