Hi Chris, > Do you know of a better solution than always lowering the clock speed to > 50MHz for this controller?
Yes, it is a better solution. As you know, SD ver.1.1 and 2.0(SDHC) cards can be applied 50MHz SD-CLK.. SD 3.0 (UHS-I) cards also can be applied 50Mhz. However UHS-I cards are available 200 or 100Mhz SD-CLK. I would like to know if the current SD Host driver has the function of setting SD-CLK to 200Mhz for SD ver3.0 compliant Host Controller. Thanks, Koji Matsumuro Ricoh Company,Ltd. Chris Ball <c...@laptop.org> wrote on 2011/07/29 09:47:53: > Hi, > On Thu, Jul 28 2011, Andi Kleen wrote: > > On Fri, Jul 29, 2011 at 09:27:56AM +0900, matsu...@nts.ricoh.co.jp wrote: > >> Dear Sir, > >> > >> Ricoh 1180:e823 device is named R5U220/R5U232 (2 devices have the same > >> device ID ). > >> So, I think it should be declared to as PCI_DEVICE_ID_RICOH_R5U220. > > > > Is that just the wrong name or will it actually cause misfunction? > I don't think it could possibly cause misfunction; it's just a macro name. > > BTW, does anyone know whether the current SDHCI-driver sets 200Mhz to > > SD-CLK for UHS-I cards ? > The Linux 3.1 SD driver will set the SD-CLK to 50MHz for every card on an > e823 device, and older kernels will do so too once the commit has been > applied to the stable trees. See this commit: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git; > a=commitdiff;h=15bed0f2fa8e1d7db201692532c210a7823d2d21 > Do you know of a better solution than always lowering the clock speed to > 50MHz for this controller? > Thanks, > - Chris. > -- > Chris Ball <c...@laptop.org> <http://printf.net/> > One Laptop Per Child _______________________________________________ stable mailing list stable@linux.kernel.org http://linux.kernel.org/mailman/listinfo/stable
