VVN2.2/VVN2.3 is the vendor version number, that is the FSL SDHC IP verion.
Best Regards Jerry Huang
-----Original Message----- From: Marek Vasut [mailto:marex@denx.de] Sent: Saturday, May 19, 2012 12:03 AM To: Huang Changming-R66093 Cc: u-boot@lists.denx.de; Andy Fleming Subject: Re: [PATCH 2/2 v3] FSL/eSDHC: enable the clock to detect the SD card
Dear Chang-Ming.Huang@freescale.com,
From: Jerry Huang Chang-Ming.Huang@freescale.com
For FSL low-end processors (VVN2.2)
What's VVN2.2 ?
, in order to detect the SD card, we should enable PEREN, HCKEN and IPGEN to enable the clock. Otherwise, after booting the u-boot, and then inserting the SD card, the SD card can't be detected. For SDHC VVN2.3 IP
VVN2.3 ?
, these bits are reserved, and SDCLKEN is used. And when accessing to these reserved bit, no any impact happened.
Signed-off-by: Jerry Huang Chang-Ming.Huang@freescale.com CC: Andy Fleming afleming@gmail.com CC: Marek Vasut marex@denx.de
changes for v2:
- correct the typo
changes for v3:
- enable all clock bits for VVN2.3 and VVN2.2
- use funciton esdhc_setbits32
- tested on p1022ds, p1025rdb, p1020mbg-pc, mpc8536ds, p3041ds
drivers/mmc/fsl_esdhc.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index a2f35e3..930a5c5 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -491,6 +491,9 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg) /* First reset the eSDHC controller */ esdhc_reset(regs);
- esdhc_setbits32(®s->sysctl, SYSCTL_PEREN | SYSCTL_HCKEN
| SYSCTL_IPGEN | SYSCTL_CKEN);- mmc->priv = cfg; mmc->send_cmd = esdhc_send_cmd; mmc->set_ios = esdhc_set_ios;
Best regards, Marek Vasut