Re: [RFC PATCH 4/7] mmc: sdhci: Add quirk to indicate broken POWER_CONTROL

Kishon Vijay Abraham I
2017-08-17T05:32:29Z

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@ti.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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