diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 1c42c8c6e632e86b3b6c3ae147b866e5c80e0301..159c95b26d33c1ec3056958e28f92e429e8c0a29 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -2169,19 +2169,31 @@ static const struct regmap_access_table tc_precious_table = {
 	.n_yes_ranges = ARRAY_SIZE(tc_precious_ranges),
 };
 
-static const struct regmap_range tc_non_writeable_ranges[] = {
-	regmap_reg_range(PPI_BUSYPPI, PPI_BUSYPPI),
-	regmap_reg_range(DSI_BUSYDSI, DSI_BUSYDSI),
-	regmap_reg_range(DSI_LANESTATUS0, DSI_INTSTATUS),
-	regmap_reg_range(TC_IDREG, SYSSTAT),
-	regmap_reg_range(GPIOI, GPIOI),
-	regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ),
-};
-
-static const struct regmap_access_table tc_writeable_table = {
-	.no_ranges = tc_non_writeable_ranges,
-	.n_no_ranges = ARRAY_SIZE(tc_non_writeable_ranges),
-};
+static bool tc_writeable_reg(struct device *dev, unsigned int reg)
+{
+	/* RO reg */
+	switch (reg) {
+	case PPI_BUSYPPI:
+	case DSI_BUSYDSI:
+	case DSI_LANESTATUS0:
+	case DSI_LANESTATUS1:
+	case DSI_INTSTATUS:
+	case TC_IDREG:
+	case SYSBOOT:
+	case SYSSTAT:
+	case GPIOI:
+	case DP0_LTSTAT:
+	case DP0_SNKLTCHGREQ:
+		return false;
+	}
+	/* WO reg */
+	switch (reg) {
+	case DSI_STARTDSI:
+	case DSI_INTCLR:
+		return true;
+	}
+	return tc_readable_reg(dev, reg);
+}
 
 static const struct regmap_config tc_regmap_config = {
 	.name = "tc358767",
@@ -2191,9 +2203,9 @@ static const struct regmap_config tc_regmap_config = {
 	.max_register = PLL_DBG,
 	.cache_type = REGCACHE_MAPLE,
 	.readable_reg = tc_readable_reg,
+	.writeable_reg = tc_writeable_reg,
 	.volatile_table = &tc_volatile_table,
 	.precious_table = &tc_precious_table,
-	.wr_table = &tc_writeable_table,
 	.reg_format_endian = REGMAP_ENDIAN_BIG,
 	.val_format_endian = REGMAP_ENDIAN_LITTLE,
 };