Re: [PATCH 2/2] mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically

[Doug Anderson]

Hi,

On Tue, Sep 25, 2018 at 8:05 AM Veerabhadrarao Badiganti
<vbadigan@xxxxxxxxxxxxxx> wrote:
> +       /*
> +        * Whenever core-clock is gated dynamically, it's needed to
> +        * re-initialize the DLL when the clock is ungated.
> +        */
> +       if (msm_host->restore_dll_cfg_needed && msm_host->clk_rate) {
> +               msm_host->restore_dll_cfg = true;
> +               mmc_retune_needed(host->mmc);

Using the boolean "restore_dll_cfg" to communicate like this seems
really fragile.  I have no basis in fact, but I worry that something
will happen in the meantime that really ought to invalidate the
"saved_tuning_phase" but the boolean will still be set.

Is there a reason you can't just call msm_config_cm_dll_phase()
directly from sdhci_msm_runtime_resume()?  Perhaps after the
clk_bulk_prepare_enable() call below?


-Doug