linux-kernel - Re: [PATCH] mmc: Add a quirk for AMD SDHC transfer mode register need to be cleared for cmd without data

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Message-ID: <54588230.1080601@amd.com>
Date:	Tue, 4 Nov 2014 15:37:20 +0800
From:	Vincent Wan <vincent.wan@....com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ray" <Ray.Huang@....com>,
	Wan Zongshun <mcuos.com@...il.com>,
	Arindam Nath <arindam.nath@....com>
Subject: Re: [PATCH] mmc: Add a quirk for AMD SDHC transfer mode register
 need to be cleared for cmd without data

On 2014年11月04日 15:51, Ulf Hansson wrote:
> On 30 October 2014 05:06, Vincent Wan <vincent.wan@....com> wrote:
>> SDHC controller in AMD chipsets require SDHC transfer mode
>> register to be cleared for commands without data. The issue was
>> uncovered during testing eMMC cards on KB/ML based platforms.
>>
>> Signed-off-by: Vincent Wan <vincent.wan@....com>
>> Signed-off-by: Arindam Nath <arindam.nath@....com>
>> Tested-by: Vikram B <vikram.b@....com>
>> Tested-by: Raghavendra Swamy <raghavendra.swamy@....com>
>
> Hi Vincent,
>
> This looks good to me, but the patch has checkpatch errors.
>
> Could you check at your side and re-send?
>
> Kind regards
> Uffe
>

Hi Ulf,

My email tool causes this issue, so I have already sent patch v2 to you.

Thanks!
Vincent Wan.
>>
>> ---
>>   drivers/mmc/host/sdhci-pci.c | 27 +++++++++++++++++++++++++++
>>   drivers/mmc/host/sdhci.c     | 11 ++++++++---
>>   include/linux/mmc/sdhci.h    |  2 ++
>>   3 files changed, 37 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
>> index 6119297..8f5c998 100644
>> --- a/drivers/mmc/host/sdhci-pci.c
>> +++ b/drivers/mmc/host/sdhci-pci.c
>> @@ -645,6 +645,23 @@ static const struct sdhci_pci_fixes sdhci_rtsx = {
>>          .probe_slot     = rtsx_probe_slot,
>>   };
>>
>> +static int amd_probe(struct sdhci_pci_chip *chip)
>> +{
>> +       struct pci_dev  *smbus_dev;
>> +
>> +       smbus_dev = pci_get_device(PCI_VENDOR_ID_AMD,
>> +                       PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, NULL);
>> +
>> +       if (smbus_dev && (smbus_dev->revision < 0x51))
>> +               chip->quirks2 |=
>> SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD;
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct sdhci_pci_fixes sdhci_amd = {
>> +       .probe          = amd_probe,
>> +};
>> +
>>   static const struct pci_device_id pci_ids[] = {
>>          {
>>                  .vendor         = PCI_VENDOR_ID_RICOH,
>> @@ -1045,6 +1062,16 @@ static const struct pci_device_id pci_ids[] = {
>>                  .driver_data    = (kernel_ulong_t)&sdhci_o2,
>>          },
>>
>> +       {
>> +               .vendor         = PCI_VENDOR_ID_AMD,
>> +               .device         = PCI_ANY_ID,
>> +               .class          = PCI_CLASS_SYSTEM_SDHCI << 8,
>> +               .class_mask     = 0xFFFF00,
>> +               .subvendor      = PCI_ANY_ID,
>> +               .subdevice      = PCI_ANY_ID,
>> +               .driver_data    = (kernel_ulong_t)&sdhci_amd,
>> +       },
>> +
>>          {       /* Generic SD host controller */
>>                  PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
>>          },
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index ada1a3e..8085f26 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -889,10 +889,15 @@ static void sdhci_set_transfer_mode(struct sdhci_host
>> *host,
>>          struct mmc_data *data = cmd->data;
>>
>>          if (data == NULL) {
>> -               /* clear Auto CMD settings for no data CMDs */
>> -               mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
>> -               sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
>> +               if (host->quirks2 &
>> +                       SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
>> +                       sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
>> +               } else {
>> +                       /* clear Auto CMD settings for no data CMDs */
>> +                       mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
>> +                       sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
>>                                  SDHCI_TRNS_AUTO_CMD23),
>> SDHCI_TRANSFER_MODE);
>> +               }
>>                  return;
>>          }
>>
>> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
>> index dba793e..0a287aa 100644
>> --- a/include/linux/mmc/sdhci.h
>> +++ b/include/linux/mmc/sdhci.h
>> @@ -100,6 +100,8 @@ struct sdhci_host {
>>   #define SDHCI_QUIRK2_BROKEN_DDR50                      (1<<7)
>>   /* Stop command (CMD12) can set Transfer Complete when not using
>> MMC_RSP_BUSY */
>>   #define SDHCI_QUIRK2_STOP_WITH_TC                      (1<<8)
>> +/* need clear transfer mode register before send cmd */
>> +#define SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD (1<<9)
>>
>>          int irq;                /* Device IRQ */
>>          void __iomem *ioaddr;   /* Mapped address */
>> --
>> 1.8.1.2
>>

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