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SubjectRe: [PATCH v2 08/29] venus: hfi_venus: fix suspend function for venus 3xx versions
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Hi Tomasz,

On 05/18/2018 06:14 PM, Tomasz Figa wrote:
> On Tue, May 15, 2018 at 5:11 PM Stanimir Varbanov <
> stanimir.varbanov@linaro.org> wrote:
>
>> This fixes the suspend function for Venus 3xx versions by
>> add a check for WFI (wait for interrupt) bit. This bit
>> is on when the ARM9 is idle and entered in low power mode.
>
>> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
>> ---
>> drivers/media/platform/qcom/venus/hfi_venus.c | 59
> ++++++++++++++++--------
>> drivers/media/platform/qcom/venus/hfi_venus_io.h | 1 +
>> 2 files changed, 41 insertions(+), 19 deletions(-)
>
>> diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c
> b/drivers/media/platform/qcom/venus/hfi_venus.c
>> index 53546174aab8..aac351f699a0 100644
>> --- a/drivers/media/platform/qcom/venus/hfi_venus.c
>> +++ b/drivers/media/platform/qcom/venus/hfi_venus.c
>> @@ -1447,7 +1447,7 @@ static int venus_suspend_3xx(struct venus_core
> *core)
>> {
>> struct venus_hfi_device *hdev = to_hfi_priv(core);
>> struct device *dev = core->dev;
>> - u32 ctrl_status, wfi_status;
>> + u32 ctrl_status, cpu_status;
>> int ret;
>> int cnt = 100;
>
>> @@ -1463,29 +1463,50 @@ static int venus_suspend_3xx(struct venus_core
> *core)
>> return -EINVAL;
>> }
>
>> - ctrl_status = venus_readl(hdev, CPU_CS_SCIACMDARG0);
>> - if (!(ctrl_status & CPU_CS_SCIACMDARG0_PC_READY)) {
>> - wfi_status = venus_readl(hdev, WRAPPER_CPU_STATUS);
>> + /*
>> + * Power collapse sequence for Venus 3xx and 4xx versions:
>> + * 1. Check for ARM9 and video core to be idle by checking WFI bit
>> + * (bit 0) in CPU status register and by checking Idle (bit
> 30) in
>> + * Control status register for video core.
>> + * 2. Send a command to prepare for power collapse.
>> + * 3. Check for WFI and PC_READY bits.
>> + */
>> +
>> + while (--cnt) {
>> + cpu_status = venus_readl(hdev, WRAPPER_CPU_STATUS);
>> ctrl_status = venus_readl(hdev, CPU_CS_SCIACMDARG0);
>
>> - ret = venus_prepare_power_collapse(hdev, false);
>> - if (ret) {
>> - dev_err(dev, "prepare for power collapse fail
> (%d)\n",
>> - ret);
>> - return ret;
>> - }
>> + if (cpu_status & WRAPPER_CPU_STATUS_WFI &&
>> + ctrl_status & CPU_CS_SCIACMDARG0_INIT_IDLE_MSG_MASK)
>> + break;
>
>> - cnt = 100;
>> - while (cnt--) {
>> - wfi_status = venus_readl(hdev,
> WRAPPER_CPU_STATUS);
>> - ctrl_status = venus_readl(hdev,
> CPU_CS_SCIACMDARG0);
>> - if (ctrl_status & CPU_CS_SCIACMDARG0_PC_READY &&
>> - wfi_status & BIT(0))
>> - break;
>> - usleep_range(1000, 1500);
>> - }
>> + usleep_range(1000, 1500);
>> }
>
> To avoid opencoding the polling, I'd suggest doing a readx_poll_timeout()
> trick:

I like the idea, will try to rework that and use readx_poll_timeout.

<snip>

--
regards,
Stan

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