On 09/14/2015 07:22 PM, Lu Yangbo-B47093 wrote:
> Hi York,
>
> Please see my comments below.
>
>> -----Original Message-----
>> From: Sun York-R58495
>> Sent: Monday, September 14, 2015 11:57 PM
>> To: Lu Yangbo-B47093; u-boot@lists.denx.de
>> Subject: Re: [PATCH 1/3] mmc: fsl_esdhc: enable dat[4:7] for eMMC4.5
>>
>> Yangbo,
>>
>> On 09/13/2015 08:04 PM, Yangbo Lu wrote:
>>> If adapter card type identification is supported for platform, we
>>> would enable dat[4:7] for eMMC4.5 card.
>>>
>>> Signed-off-by: Yangbo Lu <yangbo...@freescale.com>
>>> Cc: York Sun <york...@freescale.com>
>>> ---
>>> board/freescale/common/qixis.h | 2 ++
>>> drivers/mmc/fsl_esdhc.c | 3 +++
>>> 2 files changed, 5 insertions(+)
>>>
>>> diff --git a/board/freescale/common/qixis.h
>>> b/board/freescale/common/qixis.h index 51ce9c3..450cd0d 100644
>>> --- a/board/freescale/common/qixis.h
>>> +++ b/board/freescale/common/qixis.h
>>> @@ -127,6 +127,8 @@ void qixis_write_i2c(unsigned int reg, u8 value);
>>> #define QIXIS_ESDHC_NO_ADAPTER 0x7 /* No Card is
>> Present*/
>>> #define QIXIS_SDCLKIN 0x08
>>> #define QIXIS_SDCLKOUT 0x02
>>> +#define QIXIS_DAT5_6_7 0X02
>>> +#define QIXIS_DAT4 0X01
>>> #endif
>>>
>>> #endif
>>> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index
>>> 0b37002..639ec02 100644
>>> --- a/drivers/mmc/fsl_esdhc.c
>>> +++ b/drivers/mmc/fsl_esdhc.c
>>> @@ -747,6 +747,9 @@ void mmc_adapter_card_type_ident(void)
>>>
>>> switch (card_id) {
>>> case QIXIS_ESDHC_ADAPTER_TYPE_EMMC45:
>>> + value = QIXIS_READ(brdcfg[5]);
>>> + value |= (QIXIS_DAT4 | QIXIS_DAT5_6_7);
>>> + QIXIS_WRITE(brdcfg[5], value);
>>> break;
>>> case QIXIS_ESDHC_ADAPTER_TYPE_SDMMC_LEGACY:
>>> break;
>>>
>>
>> Does any other board have this identification feature? I see the code
>> only use qixis. How are RDB and customer boards handled?
>>
>> York
> [Lu Yangbo-B47093] This feature is used for QDS boards that use SDHC Adapter
> card. Now only T1040QDS and T2080QDS are enabled, because we want to support
> SD/MMC UHS-I speed mode on these two boards in kernel and these QIXIS
> configuration are needed for *the Adapter*. For RDB and customer boards, they
> don't use Adapter card and the default configuration is ok for SD/MMC Default
> speed mode and High speed mode.
>
I am actually more concerned how a customer board can take advantage of this.
York
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