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

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Date:   Tue, 15 Aug 2023 18:29:39 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Wenchao Chen <wenchao.chen@...soc.com>, ulf.hansson@...aro.org,
        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 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.
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(+)
> >
>