From: Jerry Huang Chang-Ming.Huang@freescale.com
For FSL low-end processors (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, 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;