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 13:37:22 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Wenchao Chen <wenchao.chen666@...il.com>,
        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 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?

> 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(+)
>>>
>>