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Subject[PATCH v4 4/4] venus: firmware: register separate driver for firmware device
Date
A separate child device is added for video firmware.
This is needed to
[1] configure the firmware context bank with the desired SID.
[2] ensure that the iova for firmware region is from 0x0.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
---
.../devicetree/bindings/media/qcom,venus.txt | 17 +++++++-
drivers/media/platform/qcom/venus/core.c | 50 +++++++++++++++++++---
drivers/media/platform/qcom/venus/firmware.c | 18 ++++++++
drivers/media/platform/qcom/venus/firmware.h | 2 +
4 files changed, 81 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/qcom,venus.txt b/Documentation/devicetree/bindings/media/qcom,venus.txt
index 00d0d1b..975fb12 100644
--- a/Documentation/devicetree/bindings/media/qcom,venus.txt
+++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
@@ -53,7 +53,7 @@

* Subnodes
The Venus video-codec node must contain two subnodes representing
-video-decoder and video-encoder.
+video-decoder and video-encoder, one optional firmware subnode.

Every of video-encoder or video-decoder subnode should have:

@@ -79,6 +79,17 @@ Every of video-encoder or video-decoder subnode should have:
power domain which is responsible for collapsing
and restoring power to the subcore.

+The firmware sub node must have:
+
+- compatible:
+ Usage: required
+ Value type: <stringlist>
+ Definition: Value should contain "venus-firmware"
+- iommus:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: A list of phandle and IOMMU specifier pairs.
+
* An Example
video-codec@1d00000 {
compatible = "qcom,msm8916-venus";
@@ -105,4 +116,8 @@ Every of video-encoder or video-decoder subnode should have:
clock-names = "core";
power-domains = <&mmcc VENUS_CORE1_GDSC>;
};
+ venus-firmware {
+ compatible = "qcom,venus-firmware";
+ iommus = <&apps_smmu 0x10b2 0x0>;
+ }
};
diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 393994e..555ba21 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -179,6 +179,21 @@ static u32 to_v4l2_codec_type(u32 codec)
}
}

+static int store_firmware_dev(struct device *dev, void *data)
+{
+ struct venus_core *core = data;
+
+ if (!core)
+ return -EINVAL;
+
+ if (of_device_is_compatible(dev->of_node, "qcom,venus-firmware")) {
+ core->fw.dev = dev;
+ core->no_tz = true;
+ }
+
+ return 0;
+}
+
static int venus_enumerate_codecs(struct venus_core *core, u32 type)
{
const struct hfi_inst_ops dummy_ops = {};
@@ -284,6 +299,13 @@ static int venus_probe(struct platform_device *pdev)
if (ret < 0)
goto err_runtime_disable;

+ ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+ if (ret)
+ goto err_runtime_disable;
+
+ /* Attempt to store firmware device */
+ device_for_each_child(dev, core, store_firmware_dev);
+
ret = venus_boot(core);
if (ret)
goto err_runtime_disable;
@@ -308,10 +330,6 @@ static int venus_probe(struct platform_device *pdev)
if (ret)
goto err_core_deinit;

- ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
- if (ret)
- goto err_dev_unregister;
-
ret = pm_runtime_put_sync(dev);
if (ret)
goto err_dev_unregister;
@@ -488,7 +506,29 @@ static __maybe_unused int venus_runtime_resume(struct device *dev)
.pm = &venus_pm_ops,
},
};
-module_platform_driver(qcom_venus_driver);
+
+static int __init venus_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&qcom_video_firmware_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&qcom_venus_driver);
+ if (ret)
+ platform_driver_unregister(&qcom_video_firmware_driver);
+
+ return ret;
+}
+module_init(venus_init);
+
+static void __exit venus_exit(void)
+{
+ platform_driver_unregister(&qcom_venus_driver);
+ platform_driver_unregister(&qcom_video_firmware_driver);
+}
+module_exit(venus_exit);

MODULE_ALIAS("platform:qcom-venus");
MODULE_DESCRIPTION("Qualcomm Venus video encoder and decoder driver");
diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
index 30130d4..d26797d 100644
--- a/drivers/media/platform/qcom/venus/firmware.c
+++ b/drivers/media/platform/qcom/venus/firmware.c
@@ -12,6 +12,7 @@
*
*/

+#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/firmware.h>
@@ -226,3 +227,20 @@ int venus_shutdown(struct venus_core *core)

return ret;
}
+
+static const struct of_device_id firmware_dt_match[] = {
+ { .compatible = "qcom,venus-firmware" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, firmware_dt_match);
+
+struct platform_driver qcom_video_firmware_driver = {
+ .driver = {
+ .name = "qcom-video-firmware",
+ .of_match_table = firmware_dt_match,
+ },
+};
+
+MODULE_ALIAS("platform:qcom-video-firmware");
+MODULE_DESCRIPTION("Qualcomm Venus firmware driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/platform/qcom/venus/firmware.h b/drivers/media/platform/qcom/venus/firmware.h
index 8456b59..de5e057 100644
--- a/drivers/media/platform/qcom/venus/firmware.h
+++ b/drivers/media/platform/qcom/venus/firmware.h
@@ -16,6 +16,8 @@

struct device;

+extern struct platform_driver qcom_video_firmware_driver;
+
int venus_boot(struct venus_core *core);
int venus_shutdown(struct venus_core *core);
int venus_set_hw_state(struct venus_core *core, bool suspend);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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