@@ -45,6 +45,8 @@
#define F_MMU_STANDARD_AXI_MODE_BIT (BIT(3) | BIT(19))
#define REG_MMU_DCM_DIS 0x050
+#define REG_MMU_WR_LEN 0x054
+#define F_MMU_WR_THROT_DIS_BIT (BIT(5) | BIT(21))
#define REG_MMU_CTRL_REG 0x110
#define F_MMU_TF_PROT_TO_PROGRAM_ADDR (2 << 4)
@@ -592,6 +594,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
writel_relaxed(regval, data->base + REG_MMU_VLD_PA_RNG);
}
writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
+ if (data->plat_data->has_wr_len) {
+ /* write command throttling mode */
+ regval = readl_relaxed(data->base + REG_MMU_WR_LEN);
+ regval &= ~F_MMU_WR_THROT_DIS_BIT;
+ writel_relaxed(regval, data->base + REG_MMU_WR_LEN);
+ }
if (data->plat_data->has_misc_ctrl) {
regval = readl_relaxed(data->base + REG_MMU_MISC_CTRL);
@@ -744,6 +752,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
struct mtk_iommu_suspend_reg *reg = &data->reg;
void __iomem *base = data->base;
+ reg->wr_len = readl_relaxed(base + REG_MMU_WR_LEN);
reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL);
reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS);
reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
@@ -768,6 +777,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret);
return ret;
}
+ writel_relaxed(reg->wr_len, base + REG_MMU_WR_LEN);
writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL);
writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
@@ -25,6 +25,7 @@ struct mtk_iommu_suspend_reg {
u32 int_main_control;
u32 ivrp_paddr;
u32 vld_pa_rng;
+ u32 wr_len;
};
enum mtk_iommu_plat {
@@ -43,6 +44,7 @@ struct mtk_iommu_plat_data {
bool has_misc_ctrl;
bool has_sub_comm;
bool has_vld_pa_rng;
+ bool has_wr_len;
bool reset_axi;
u32 inv_sel_reg;
unsigned char larbid_remap[8][4];
Some platforms(ex: mt6779) have a new register called by REG_MMU_WR_LEN to improve performance. This patch add this register definition. Signed-off-by: Chao Hao <chao.hao@mediatek.com> --- drivers/iommu/mtk_iommu.c | 10 ++++++++++ drivers/iommu/mtk_iommu.h | 2 ++ 2 files changed, 12 insertions(+)