[PATCH 18/25] media: venus: hfi: Add 6xx AXI halt logic

[Bryan O'Donoghue <bryan.odonoghue@linaro.org>]

From: Dikshita Agarwal <dikshita@codeaurora.org>

This patch takes the downstream AXI halt routine and applies it when
IS_V6() is true.

bod: Converted to readl_poll_timeout()
     Converted LPI update timeout to dev_dbg. In practice this register
     never appears to update with the value 0x07. Discussing with contacts
     in qcom video team, this toggle only pertains to low-power mode.
     Keeping the write for the sake of fidelity with downstream.

Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
Co-developed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 drivers/media/platform/qcom/venus/hfi_venus.c | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 24cf20f76e7f..01c100db07d3 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -541,10 +541,55 @@ static int venus_halt_axi(struct venus_hfi_device *hdev)
 {
 	void __iomem *wrapper_base = hdev->core->wrapper_base;
 	void __iomem *vbif_base = hdev->core->vbif_base;
+	void __iomem *cpu_cs_base = hdev->core->cpu_cs_base;
+	void __iomem *aon_base = hdev->core->aon_base;
 	struct device *dev = hdev->core->dev;
 	u32 val;
+	u32 mask_val;
 	int ret;
 
+	if (IS_V6(hdev->core)) {
+		writel(0x3, cpu_cs_base + CPU_CS_X2RPMH_V6);
+
+		writel(0x1, aon_base + AON_WRAPPER_MVP_NOC_LPI_CONTROL);
+		ret = readl_poll_timeout(aon_base + AON_WRAPPER_MVP_NOC_LPI_STATUS,
+					 val,
+					 val & BIT(0),
+					 POLL_INTERVAL_US,
+					 VBIF_AXI_HALT_ACK_TIMEOUT_US);
+		if (ret) {
+			dev_err(dev, "NOC not in qaccept status %x\n", val);
+			return -ETIMEDOUT;
+		}
+
+		/* HPG 6.1.2 Step 3, debug bridge to low power */
+		mask_val = (BIT(2) | BIT(1) | BIT(0));
+		writel(mask_val, wrapper_base + WRAPPER_DEBUG_BRIDGE_LPI_CONTROL_V6);
+
+		ret = readl_poll_timeout(wrapper_base + WRAPPER_DEBUG_BRIDGE_LPI_STATUS_V6,
+					 val,
+					 (val & mask_val) == mask_val,
+					 POLL_INTERVAL_US,
+					 VBIF_AXI_HALT_ACK_TIMEOUT_US);
+
+		if (ret)
+			dev_dbg(dev, "DBLP Set: status %x\n", val);
+
+		/* HPG 6.1.2 Step 4, debug bridge to lpi release */
+		writel(0x00, wrapper_base + WRAPPER_DEBUG_BRIDGE_LPI_CONTROL_V6);
+		ret = readl_poll_timeout(wrapper_base + WRAPPER_DEBUG_BRIDGE_LPI_STATUS_V6,
+					 val,
+					 val == 0,
+					 POLL_INTERVAL_US,
+					 VBIF_AXI_HALT_ACK_TIMEOUT_US);
+
+		if (ret) {
+			dev_err(dev, "DBLP Release: lpi_status %x\n", val);
+			return -ETIMEDOUT;
+		}
+		return 0;
+	}
+
 	if (IS_V4(hdev->core)) {
 		val = readl(wrapper_base + WRAPPER_CPU_AXI_HALT);
 		val |= WRAPPER_CPU_AXI_HALT_HALT;
-- 
2.29.2