Re: [PATCH v2 2/5] media: venus: add a routine to set venus state

Jordan Crouse
2018-06-01T21:21:17Z

On Sat, Jun 02, 2018 at 01:56:05AM +0530, Vikash Garodia wrote:
> Add a new routine which abstracts the TZ call to
> set the video hardware state.
>
> Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
> ---
> drivers/media/platform/qcom/venus/core.h | 5 +++++
> drivers/media/platform/qcom/venus/firmware.c | 28 +++++++++++++++++++++++++++
> drivers/media/platform/qcom/venus/firmware.h | 1 +
> drivers/media/platform/qcom/venus/hfi_venus.c | 13 ++++---------
> 4 files changed, 38 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index 85e66e2..e7bfb63 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -35,6 +35,11 @@ struct reg_val {
> u32 value;
> };
>
> +enum tzbsp_video_state {
> + TZBSP_VIDEO_SUSPEND = 0,
> + TZBSP_VIDEO_RESUME

You should put a comma after the last item to reduce future patch sizes.

> +};
> +
> struct venus_resources {
> u64 dma_mask;
> const struct freq_tbl *freq_tbl;
> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
> index 7d89b5a..b4664ed 100644
> --- a/drivers/media/platform/qcom/venus/firmware.c
> +++ b/drivers/media/platform/qcom/venus/firmware.c
> @@ -53,6 +53,34 @@ static void venus_reset_hw(struct venus_core *core)
> /* Bring Arm9 out of reset */
> writel_relaxed(0, reg_base + WRAPPER_A9SS_SW_RESET);
> }
> +
> +int venus_set_hw_state(enum tzbsp_video_state state, struct venus_core *core)
> +{
> + int ret;
> + struct device *dev = core->dev;

If you get rid of the log message as you should, you don't need this.

> + void __iomem *reg_base = core->base;
> +
> + switch (state) {
> + case TZBSP_VIDEO_SUSPEND:
> + if (qcom_scm_is_available())
> + ret = qcom_scm_set_remote_state(TZBSP_VIDEO_SUSPEND, 0);
> + else
> + writel_relaxed(1, reg_base + WRAPPER_A9SS_SW_RESET);

You can just use core->base here and not bother making a local variable for it.

> + break;
> + case TZBSP_VIDEO_RESUME:
> + if (qcom_scm_is_available())
> + ret = qcom_scm_set_remote_state(TZBSP_VIDEO_RESUME, 0);
> + else
> + venus_reset_hw(core);
> + break;
> + default:
> + dev_err(dev, "invalid state\n");

state is a enum - you are highly unlikely to be calling it in your own code with
a random value. It is smart to have the default, but you don't need the log
message - that is just wasted space in the binary.

> + break;
> + }

There are three paths in the switch statement that could end up with 'ret' being
uninitialized here. Set it to 0 when you declare it.

> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(venus_set_hw_state);
> +
> int venus_boot(struct device *dev, const char *fwname)
> {
> const struct firmware *mdt;
> diff --git a/drivers/media/platform/qcom/venus/firmware.h b/drivers/media/platform/qcom/venus/firmware.h
> index 428efb5..1336729 100644
> --- a/drivers/media/platform/qcom/venus/firmware.h
> +++ b/drivers/media/platform/qcom/venus/firmware.h
> @@ -18,5 +18,6 @@
>
> int venus_boot(struct device *dev, const char *fwname);
> int venus_shutdown(struct device *dev);
> +int venus_set_hw_state(enum tzbsp_video_state, struct venus_core *core);
>
> #endif
> diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
> index f61d34b..797a9f5 100644
> --- a/drivers/media/platform/qcom/venus/hfi_venus.c
> +++ b/drivers/media/platform/qcom/venus/hfi_venus.c
> @@ -19,7 +19,6 @@
> #include <linux/interrupt.h>
> #include <linux/iopoll.h>
> #include <linux/kernel.h>
> -#include <linux/qcom_scm.h>
> #include <linux/slab.h>
>
> #include "core.h"
> @@ -27,6 +26,7 @@
> #include "hfi_msgs.h"
> #include "hfi_venus.h"
> #include "hfi_venus_io.h"
> +#include "firmware.h"
>
> #define HFI_MASK_QHDR_TX_TYPE 0xff000000
> #define HFI_MASK_QHDR_RX_TYPE 0x00ff0000
> @@ -55,11 +55,6 @@
> #define IFACEQ_VAR_LARGE_PKT_SIZE 512
> #define IFACEQ_VAR_HUGE_PKT_SIZE (1024 * 12)
>
> -enum tzbsp_video_state {
> - TZBSP_VIDEO_STATE_SUSPEND = 0,
> - TZBSP_VIDEO_STATE_RESUME
> -};
> -
> struct hfi_queue_table_header {
> u32 version;
> u32 size;
> @@ -574,7 +569,7 @@ static int venus_power_off(struct venus_hfi_device *hdev)
> if (!hdev->power_enabled)
> return 0;
>
> - ret = qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_SUSPEND, 0);
> + ret = venus_set_hw_state(TZBSP_VIDEO_SUSPEND, hdev->core);
> if (ret)
> return ret;
>
> @@ -594,7 +589,7 @@ static int venus_power_on(struct venus_hfi_device *hdev)
> if (hdev->power_enabled)
> return 0;
>
> - ret = qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_RESUME, 0);
> + ret = venus_set_hw_state(TZBSP_VIDEO_RESUME, hdev->core);
> if (ret)
> goto err;
>
> @@ -607,7 +602,7 @@ static int venus_power_on(struct venus_hfi_device *hdev)
> return 0;
>
> err_suspend:
> - qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_SUSPEND, 0);
> + venus_set_hw_state(TZBSP_VIDEO_SUSPEND, hdev->core);
> err:
> hdev->power_enabled = false;
> return ret;

--
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