On Fri, May 15, 2015 at 07:49:29AM +0000, Joakim Tjernlund wrote: > On Fri, 2015-05-15 at 15:36 +0800, Kevin Hao wrote: > > On Fri, May 15, 2015 at 07:02:44AM +0000, Joakim Tjernlund wrote: > > > Reverting this seem a bit to much. Looking in the log it seems commit > > > 2317f56c055fcad524bf6a873df48a754e7ebc4d > > > introduced the error by not checking for host->ops->set_bus_width before > > > calling it. > > > > > > How does this work for you? > > > > No. My sd card still don't work with this change. > > > > > > > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > > > index c80287a..23603b2 100644 > > > --- a/drivers/mmc/host/sdhci.c > > > +++ b/drivers/mmc/host/sdhci.c > > > @@ -1528,7 +1528,10 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios) > > > if (host->ops->platform_send_init_74_clocks) > > > host->ops->platform_send_init_74_clocks(host, ios->power_mode); > > > > > > - host->ops->set_bus_width(host, ios->bus_width); > > > + if (host->ops->set_bus_width) > > > + host->ops->set_bus_width(host, ios->bus_width); > > > + else > > > + sdhci_set_bus_width(host, ios->bus_width); > > > > The default sdhci_set_bus_width() doesn't apply to the esdhc controller on my > > board (p2020rdb). This controller is compatible with the sd host specification > > 2.0 and the implementation of sdhci_set_bus_width() can't set the bus width > > correctly for it. > > But the controller is the same as for T1042 I presume? No. As I know the controller on t1042 is compatible with sd host specification 3. > The bus width is in SDHCI_HOST_CONTROL > and the 8BIT is bit 29 in the register? Yes, that is true. > > What bus width do you use and what is the failure? 4 bit sd card. I got some error like this: mmcblk0: error -84 transferring data, sector 3911672, nr 8, cmd response 0x900, card status 0xb0 Thanks, Kevin > >nk Jocke > >
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