[PATCH v4 7/7] scsi: ufs: rockchip: initial support for UFS

[Shawn Lin]

在 2024/11/4 18:57, Ulf Hansson 写道:
> On Mon, 4 Nov 2024 at 08:34, Shawn Lin <shawn.lin at rock-chips.com> wrote:
>>
>> RK3576 SoC contains a UFS controller, add initial support for it.
>> The features are:
>> (1) support UFS 2.0 features
>> (2) High speed up to HS-G3
>> (3) 2RX-2TX lanes
>> (4) auto H8 entry and exit
>>
>> Software limitation:
>> (1) HCE procedure: enable controller->enable intr->dme_reset->dme_enable
>> (2) disable unipro timeout values before power mode change
>>
>> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
>> ---
>>
>> Changes in v4:
>> - deal with power domain of rpm and spm suggested by Ulf
>> - Fix typo and disable clks in ufs_rockchip_remove
>> - remove clk_disable_unprepare(host->ref_out_clk) from
>>    ufs_rockchip_remove
>>
> 
> [...]
> 
>> +#ifdef CONFIG_PM
>> +static int ufs_rockchip_runtime_suspend(struct device *dev)
>> +{
>> +       struct ufs_hba *hba = dev_get_drvdata(dev);
>> +       struct ufs_rockchip_host *host = ufshcd_get_variant(hba);
>> +
>> +       clk_disable_unprepare(host->ref_out_clk);
>> +
>> +       /* Shouldn't power down if rpm_lvl is less than level 5. */
>> +       dev_pm_genpd_rpm_always_on(dev, hba->rpm_lvl < UFS_PM_LVL_5 ? true : false);
>> +
>> +       return ufshcd_runtime_suspend(dev);
>> +}
>> +
>> +static int ufs_rockchip_runtime_resume(struct device *dev)
>> +{
>> +       struct ufs_hba *hba = dev_get_drvdata(dev);
>> +       struct ufs_rockchip_host *host = ufshcd_get_variant(hba);
>> +       int err;
>> +
>> +       err = clk_prepare_enable(host->ref_out_clk);
>> +       if (err) {
>> +               dev_err(hba->dev, "failed to enable ref out clock %d\n", err);
>> +               return err;
>> +       }
>> +
>> +       reset_control_assert(host->rst);
>> +       usleep_range(1, 2);
>> +       reset_control_deassert(host->rst);
>> +
>> +       return ufshcd_runtime_resume(dev);
>> +}
>> +#endif
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int ufs_rockchip_system_suspend(struct device *dev)
>> +{
>> +       struct ufs_hba *hba = dev_get_drvdata(dev);
>> +
>> +       if (hba->spm_lvl < 5)
>> +               device_set_wakeup_path(dev);
> 
> Please use device_set_awake_path() instead.
> 
> Ideally all users of device_set_wakeup_path() should convert into
> device_set_awake_path(), it's just that we haven't been able to
> complete the conversion yet.

Will use device_set_awake_path().

> 
>> +       else
>> +               device_clr_wakeup_path(dev);
> 
> This isn't needed. The flag is getting cleared in device_prepare().
> 
>> +
>> +       return ufshcd_system_suspend(dev);
> 
> Don't you want to disable the clock during system suspend too? If the
> device is runtime resumed at this point, the clock will be left
> enabled, no?

Good point. Will fix it.

> 
>> +}
>> +#endif
>> +
>> +static const struct dev_pm_ops ufs_rockchip_pm_ops = {
>> +       SET_SYSTEM_SLEEP_PM_OPS(ufs_rockchip_system_suspend, ufshcd_system_resume)
>> +       SET_RUNTIME_PM_OPS(ufs_rockchip_runtime_suspend, ufs_rockchip_runtime_resume, NULL)
>> +       .prepare         = ufshcd_suspend_prepare,
>> +       .complete        = ufshcd_resume_complete,
>> +};
>> +
> 
> [...]
> 
> Kind regards
> Uffe
>