linux-kernel - [PATCH 08/28] venus: hfi_venus: add suspend function for 4xx version

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Message-Id: <20180424124436.26955-9-stanimir.varbanov@linaro.org>
Date:   Tue, 24 Apr 2018 15:44:16 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Vikash Garodia <vgarodia@...eaurora.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH 08/28] venus: hfi_venus: add suspend function for 4xx version

This adds suspend (power collapse) function with slightly
different order of calls comparing with Venus 3xx.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 drivers/media/platform/qcom/venus/hfi_venus.c | 52 +++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 53546174aab8..f61d34bf61b4 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -1443,6 +1443,55 @@ static int venus_suspend_1xx(struct venus_core *core)
 	return 0;
 }
 
+static int venus_suspend_4xx(struct venus_core *core)
+{
+	struct venus_hfi_device *hdev = to_hfi_priv(core);
+	struct device *dev = core->dev;
+	u32 val;
+	int ret;
+
+	if (!hdev->power_enabled || hdev->suspended)
+		return 0;
+
+	mutex_lock(&hdev->lock);
+	ret = venus_is_valid_state(hdev);
+	mutex_unlock(&hdev->lock);
+
+	if (!ret) {
+		dev_err(dev, "bad state, cannot suspend\n");
+		return -EINVAL;
+	}
+
+	ret = venus_prepare_power_collapse(hdev, false);
+	if (ret) {
+		dev_err(dev, "prepare for power collapse fail (%d)\n", ret);
+		return ret;
+	}
+
+	ret = readl_poll_timeout(core->base + CPU_CS_SCIACMDARG0, val,
+				 val & CPU_CS_SCIACMDARG0_PC_READY,
+				 POLL_INTERVAL_US, 100000);
+	if (ret) {
+		dev_err(dev, "Polling power collapse ready timed out\n");
+		return ret;
+	}
+
+	mutex_lock(&hdev->lock);
+
+	ret = venus_power_off(hdev);
+	if (ret) {
+		dev_err(dev, "venus_power_off (%d)\n", ret);
+		mutex_unlock(&hdev->lock);
+		return ret;
+	}
+
+	hdev->suspended = true;
+
+	mutex_unlock(&hdev->lock);
+
+	return 0;
+}
+
 static int venus_suspend_3xx(struct venus_core *core)
 {
 	struct venus_hfi_device *hdev = to_hfi_priv(core);
@@ -1507,6 +1556,9 @@ static int venus_suspend(struct venus_core *core)
 	if (core->res->hfi_version == HFI_VERSION_3XX)
 		return venus_suspend_3xx(core);
 
+	if (core->res->hfi_version == HFI_VERSION_4XX)
+		return venus_suspend_4xx(core);
+
 	return venus_suspend_1xx(core);
 }
 
-- 
2.14.1