Add F_MMU_IN_ORDER_WR_EN_MASK and F_MMU_STANDARD_AXI_MODE_EN_MASK
definitions in MISC_CTRL register.
F_MMU_STANDARD_AXI_MODE_EN_MASK:
If we set F_MMU_STANDARD_AXI_MODE_EN_MASK (bit[3][19] = 0, not follow
standard AXI protocol), the iommu will priorize sending of urgent read
command over a normal read command. This improves the performance.
F_MMU_IN_ORDER_WR_EN_MASK:
If we set F_MMU_IN_ORDER_WR_EN_MASK (bit[1][17] = 0, out-of-order write),
the iommu will re-order write commands and send the write commands with
higher priority. Otherwise the sending of write commands will be done in
order. The feature is controlled by OUT_ORDER_WR_EN platform data flag.
Cc: Matthias Brugger <matthias....@gmail.com>
Suggested-by: Yong Wu <yong...@mediatek.com>
Signed-off-by: Chao Hao <chao....@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 40ca564d97af..219d7aa6f059 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -42,6 +42,9 @@
#define F_INVLD_EN1 BIT(1)
#define REG_MMU_MISC_CTRL 0x048
+#define F_MMU_IN_ORDER_WR_EN_MASK (BIT(1) | BIT(17))
+#define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19))
+
#define REG_MMU_DCM_DIS 0x050
#define REG_MMU_CTRL_REG 0x110
@@ -105,6 +108,7 @@
#define HAS_BCLK BIT(1)
#define HAS_VLD_PA_RNG BIT(2)
#define RESET_AXI BIT(3)
+#define OUT_ORDER_WR_EN BIT(4)
#define MTK_IOMMU_HAS_FLAG(pdata, _x) \
((((pdata)->flags) & (_x)) == (_x))
@@ -585,8 +589,14 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data
*data)
if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) {
/* The register is called STANDARD_AXI_MODE in this case */
- writel_relaxed(0, data->base + REG_MMU_MISC_CTRL);
+ regval = 0;
+ } else {
+ regval = readl_relaxed(data->base + REG_MMU_MISC_CTRL);
+ regval &= ~F_MMU_STANDARD_AXI_MODE_MASK;
+ if (MTK_IOMMU_HAS_FLAG(data->plat_data, OUT_ORDER_WR_EN))
+ regval &= ~F_MMU_IN_ORDER_WR_EN_MASK;
}
+ writel_relaxed(regval, data->base + REG_MMU_MISC_CTRL);
if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
dev_name(data->dev), (void *)data)) {
--
2.18.0
