[PATCH v22 06/24] soc: mediatek: add mtk_mmsys_update_bits API

["Nancy.Lin" <nancy.lin@xxxxxxxxxxxx>]

Add mtk_mmsys_update_bits API. Simplify code for update  mmsys reg.
It is a preparation for adding support for mmsys config API.

Signed-off-by: Nancy.Lin <nancy.lin@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 drivers/soc/mediatek/mtk-mmsys.c | 36 ++++++++++++++------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index a74c86197d6a..b7c7cd469343 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -192,22 +192,27 @@ static int mtk_mmsys_find_match_drvdata(struct mtk_mmsys *mmsys,
 	return -EINVAL;
 }
 
+static void mtk_mmsys_update_bits(struct mtk_mmsys *mmsys, u32 offset, u32 mask, u32 val)
+{
+	u32 tmp;
+
+	tmp = readl_relaxed(mmsys->regs + offset);
+	tmp = (tmp & ~mask) | val;
+	writel_relaxed(tmp, mmsys->regs + offset);
+}
+
 void mtk_mmsys_ddp_connect(struct device *dev,
 			   enum mtk_ddp_comp_id cur,
 			   enum mtk_ddp_comp_id next)
 {
 	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
 	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
-	u32 reg;
 	int i;
 
 	for (i = 0; i < mmsys->data->num_routes; i++)
-		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
-			reg = readl_relaxed(mmsys->regs + routes[i].addr);
-			reg &= ~routes[i].mask;
-			reg |= routes[i].val;
-			writel_relaxed(reg, mmsys->regs + routes[i].addr);
-		}
+		if (cur == routes[i].from_comp && next == routes[i].to_comp)
+			mtk_mmsys_update_bits(mmsys, routes[i].addr, routes[i].mask,
+					      routes[i].val);
 }
 EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
 
@@ -217,15 +222,11 @@ void mtk_mmsys_ddp_disconnect(struct device *dev,
 {
 	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
 	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
-	u32 reg;
 	int i;
 
 	for (i = 0; i < mmsys->data->num_routes; i++)
-		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
-			reg = readl_relaxed(mmsys->regs + routes[i].addr);
-			reg &= ~routes[i].mask;
-			writel_relaxed(reg, mmsys->regs + routes[i].addr);
-		}
+		if (cur == routes[i].from_comp && next == routes[i].to_comp)
+			mtk_mmsys_update_bits(mmsys, routes[i].addr, routes[i].mask, 0);
 }
 EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);
 
@@ -234,18 +235,13 @@ static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned l
 {
 	struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);
 	unsigned long flags;
-	u32 reg;
 
 	spin_lock_irqsave(&mmsys->lock, flags);
 
-	reg = readl_relaxed(mmsys->regs + mmsys->data->sw0_rst_offset);
-
 	if (assert)
-		reg &= ~BIT(id);
+		mtk_mmsys_update_bits(mmsys, mmsys->data->sw0_rst_offset, BIT(id), 0);
 	else
-		reg |= BIT(id);
-
-	writel_relaxed(reg, mmsys->regs + mmsys->data->sw0_rst_offset);
+		mtk_mmsys_update_bits(mmsys, mmsys->data->sw0_rst_offset, BIT(id), BIT(id));
 
 	spin_unlock_irqrestore(&mmsys->lock, flags);
 
-- 
2.18.0