From: Adrian Hunter <adrian.hunter@intel.com>
To: Masahiro Yamada <yamada.masahiro@socionext.com>,
linux-mmc@vger.kernel.org
Cc: Ulf Hansson <ulf.hansson@linaro.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/2] mmc: sdhci: export sdhci_execute_tuning()
Date: Thu, 8 Dec 2016 13:53:03 +0200 [thread overview]
Message-ID: <5a38edc8-f9dc-ec58-4faa-996967adc43c@intel.com> (raw)
In-Reply-To: <1662520f-5605-8991-73b2-f75af5618a52@intel.com>
On 08/12/16 13:49, Adrian Hunter wrote:
> On 05/12/16 04:10, Masahiro Yamada wrote:
>> Some SDHCI-compat controllers support not only SD, but also eMMC,
>> but they use different commands for tuning: CMD19 for SD, CMD21 for
>> eMMC.
>>
>> Due to the difference of the underlying mechanism, some controllers
>> (at least, the Cadence IP is the case) provide their own registers
>> for the eMMC tuning.
>>
>> This commit will be useful when we want to override .execute_tuning
>> callback (for eMMC HS200 tuning), but still let it fall back to
>> sdhci_execute_tuning() for SD timing.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>
> Adrian Hunter <adrian.hunter@intel.com>
I mean:
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
>
>> ---
>>
>> I want to use this in the next commit.
>> The Cadence IP supports eMMC as well as SD.
>>
>> I want to re-use the sdhci_execute_tuning() for SD timing.
>>
>> On the other hand, Cadence provides its own way for eMMC HS200 tuning;
>> I need to touch some registers that are specific to Cadence's design.
>>
>>
>> Changes in v4:
>> - export sdhci_execute_tuning() instead of using
>> execute_execute_tuning()
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>> drivers/mmc/host/sdhci.c | 3 ++-
>> drivers/mmc/host/sdhci.h | 1 +
>> 2 files changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 42ef3eb..0c03a89 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -1948,7 +1948,7 @@ static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
>> return 0;
>> }
>>
>> -static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> +int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> {
>> struct sdhci_host *host = mmc_priv(mmc);
>> u16 ctrl;
>> @@ -2141,6 +2141,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> spin_unlock_irqrestore(&host->lock, flags);
>> return err;
>> }
>> +EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
>>
>> static int sdhci_select_drive_strength(struct mmc_card *card,
>> unsigned int max_dtr, int host_drv,
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 9c35776..786eee9 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -689,6 +689,7 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
>> void sdhci_set_bus_width(struct sdhci_host *host, int width);
>> void sdhci_reset(struct sdhci_host *host, u8 mask);
>> void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
>> +int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
>>
>> #ifdef CONFIG_PM
>> extern int sdhci_suspend_host(struct sdhci_host *host);
>>
>
>
next prev parent reply other threads:[~2016-12-08 11:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-05 2:10 [PATCH v4 0/2] mmc: sdhci: export sdhci_execute_tuning(), then add Cadence SDHCI driver Masahiro Yamada
2016-12-05 2:10 ` [PATCH v4 1/2] mmc: sdhci: export sdhci_execute_tuning() Masahiro Yamada
2016-12-08 11:49 ` Adrian Hunter
2016-12-08 11:53 ` Adrian Hunter [this message]
2016-12-08 12:31 ` Ulf Hansson
2016-12-05 2:10 ` [PATCH v4 2/2] mmc: sdhci-cadence: add Cadence SD4HC support Masahiro Yamada
2016-12-08 11:53 ` Adrian Hunter
2016-12-08 12:32 ` Ulf Hansson
2016-12-08 12:35 ` Masahiro Yamada
2016-12-08 12:52 ` Masahiro Yamada
2016-12-08 14:05 ` Ulf Hansson
2016-12-08 16:16 ` Masahiro Yamada
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