linux-kernel - Re: [RFC PATCH 4/7] mmc: sdhci: Add quirk to indicate broken POWER

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Date:   Thu, 17 Aug 2017 11:02:29 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     <nsekhar@...com>, <linux-omap@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 4/7] mmc: sdhci: Add quirk to indicate broken
 POWER_CONTROL



On Tuesday 15 August 2017 01:11 PM, Adrian Hunter wrote:
> On 07/08/17 19:01, Kishon Vijay Abraham I wrote:
>> TI's implementation of sdhci controller used in DRA7 SoC's uses
>> POWER_CONTROL register for configuring IO voltage and not
>> for core voltage (vdd) which is it's intended use. Add a quirk
>> to indicate broken POWER_CONTROL register.
> 
> A quirk isn't needed for this.  Use the ->set_power() callback instead.

sure!

Thanks
Kishon
> 
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/mmc/host/sdhci.c | 6 ++++++
>>  drivers/mmc/host/sdhci.h | 2 ++
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index d5050ec42481..a7465a56e6b5 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -1419,6 +1419,9 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
>>  
>>  	mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
>>  
>> +	if (host->quirks2 & SDHCI_QUIRK2_BROKEN_POWER_CONTROL)
>> +		return;
>> +
>>  	if (mode != MMC_POWER_OFF)
>>  		sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
>>  	else
>> @@ -1430,6 +1433,9 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
>>  {
>>  	u8 pwr = 0;
>>  
>> +	if (host->quirks2 & SDHCI_QUIRK2_BROKEN_POWER_CONTROL)
>> +		return;
>> +
>>  	if (mode != MMC_POWER_OFF) {
>>  		switch (1 << vdd) {
>>  		case MMC_VDD_165_195:
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 39c7a2723906..ba94cca7c892 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -439,6 +439,8 @@ struct sdhci_host {
>>  #define SDHCI_QUIRK2_NO_CRC_STRIPPING			(1<<16)
>>  /* Controller has bad caps bits, but really supports DMA */
>>  #define SDHCI_QUIRK2_FORCE_ADMA				(1<<17)
>> +/* Controller uses POWER_CONTROL for managing IO voltage and not core voltage */
>> +#define SDHCI_QUIRK2_BROKEN_POWER_CONTROL		(1<<18)
>>  
>>  	int irq;		/* Device IRQ */
>>  	void __iomem *ioaddr;	/* Mapped address */
>>
> 
> --
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