linux-kernel - Re: [PATCH V2 0/2] mmc: sdhci-sprd: Add SD HS mode online tuning

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Message-ID: <CA+Da2qxf0o4C-yQZ4EirSRZCGs7a+BZLdxpmXeVM1zsMxG9rmQ@mail.gmail.com>
Date:   Tue, 15 Aug 2023 18:55:23 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Wenchao Chen <wenchao.chen@...soc.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhenxiong.lai@...soc.com,
        chunyan.zhang@...soc.com, yuelin.tang@...soc.com
Subject: Re: [PATCH V2 0/2] mmc: sdhci-sprd: Add SD HS mode online tuning

On Tue, Aug 15, 2023 at 6:37 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 15/08/23 13:29, Wenchao Chen wrote:
> > On Tue, Aug 15, 2023 at 2:21 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
> >>
> >> On 15/08/23 04:40, Wenchao Chen wrote:
> >>> Change in v2:
> >>> - add mmc_sd_switch() and mmc_send_status() to the header file
> >>> - split up core changes from host driver changes
> >>> - Use pr_debug instead of dev_info and dev_dbg
> >>> - Optimize the best sampled value algorithm
> >>
> >> What about hooking ->set_ios() as Ulf suggested?
> >>
> >
> > I've tried that, but it's not a good way to do it.
> > We found that sdhci_runtime_resume_host() calls ->set_ios, but we
> > don't want to do that.
>
> Given that sdhci_sprd_runtime_resume() calls sdhci_runtime_resume_host(),
> it should be possible to determine when to tune, right?
>

You mean like this? For example:
static int sdhci_sprd_runtime_resume(struct device *dev)
{
...
sprd_host->need_hs_tuning = false;
sdhci_runtime_resume_host(host, 1);
sprd_host->need_hs_tuning = true;
...
}

> > We just need SD HS mode tuning at mmc_sd_init_card().
> >
> >>>
> >>> Wenchao Chen (2):
> >>>   mmc: core: Add host specific tuning support for SD HS mode
> >>>   mmc: sdhci-sprd: Add SD HS mode online tuning
> >>>
> >>>  drivers/mmc/core/sd.c         |  12 +++
> >>>  drivers/mmc/core/sd_ops.c     |   1 +
> >>>  drivers/mmc/host/sdhci-sprd.c | 152 ++++++++++++++++++++++++++++++++++
> >>>  include/linux/mmc/host.h      |   8 ++
> >>>  4 files changed, 173 insertions(+)
> >>>
> >>
>