[PATCH V3 0/5] sdhci-esdhc-imx: use gpio for write protection and card detection

[Shawn Guo]

On Thu, Feb 24, 2011 at 11:51:28PM +0800, Shawn Guo wrote:
> On Thu, Feb 24, 2011 at 04:18:05PM +0800, Shawn Guo wrote:
> > Hi Wolfram,
> > 
> > On Wed, Feb 23, 2011 at 02:51:53PM +0100, Wolfram Sang wrote:
> > > Take #3, changes:
> > > 
> > > * also intercept calls to SDHCI_SIGNAL_ENABLE (needed on mx25)
> > > * remove unconditional BROKEN_CARD_DETECTION (leftover)
> > > * improved kernel-doc about unused GPIO
> > > * added tags from Eric
> > > 
> > > Tested now by me and Marc on mx35, Eric on mx25/35/51. Arnaud, did you have a
> > > chance to retest on mx51? What about the FSL guys? :)
> > > 
> > I'm testing it on mx25 3ds and mx51 babbage. Both card-detect and
> > write-protect are working on mx25 3ds, but write-protect has some
> > problem on babbage, and I need some time to figure it out.
> > 
> I just figured out why wp_gpio does not work on mx51.
> 
> +       if (cpu_is_mx25() || cpu_is_mx35()) {
> +               /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
>                 host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK;
> +               /* write_protect can't be routed to controller, use gpio */
> +               sdhci_esdhc_ops.get_ro = esdhc_pltfm_get_ro;
> +       }
> 
> Would it make sense to do the same for mx51?  On babbage board,
> SD1_WP is routed to controller, but SD2_WP is not, so we have to use
> gpio for SD2 write_protect.
> 
We should probably have esdhc_pltfm_get_ro whenever platform provides
a wp_gpio, and fall on controller SD_WP only when platform does not
provide the wp_gpio.

-- 
Regards,
Shawn