drm/tidss: Check for K2G in in dispc_softreset()

[ Upstream commit 1518251 ]

K2G doesn't have softreset feature. Instead of having every caller of
dispc_softreset() check for K2G, move the check into dispc_softreset(),
and make dispc_softreset() return 0 in case of K2G.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Aradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20231109-tidss-probe-v2-6-ac91b5ea35c0@ideasonboard.com
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Stable-dep-of: bc288a9 ("drm/tidss: Fix dss reset")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/tidss/tidss_dispc.c

@@ -2707,6 +2707,10 @@ static int dispc_softreset(struct dispc_device *dispc)
 	u32 val;
 	int ret = 0;
 
+	/* K2G display controller does not support soft reset */
+	if (dispc->feat->subrev == DISPC_K2G)
+		return 0;
+
 	/* Soft reset */
 	REG_FLD_MOD(dispc, DSS_SYSCONFIG, 1, 1, 1);
 	/* Wait for reset to complete */
@@ -2829,12 +2833,9 @@ int dispc_init(struct tidss_device *tidss)
 	of_property_read_u32(dispc->dev->of_node, "max-memory-bandwidth",
 			     &dispc->memory_bandwidth_limit);
 
-	/* K2G display controller does not support soft reset */
-	if (feat->subrev != DISPC_K2G) {
-		r = dispc_softreset(dispc);
-		if (r)
-			return r;
-	}
+	r = dispc_softreset(dispc);
+	if (r)
+		return r;
 
 	tidss->dispc = dispc;