-----Original Message----- From: linux-mmc-ow...@vger.kernel.org [mailto:linux-mmc-ow...@vger.kernel.org] On Behalf Of Chris Ball Sent: Monday, November 07, 2011 9:20 PM To: Liu Qiang-B32616 Cc: linux-mmc@vger.kernel.org; Li Yang-R58472; Gala Kumar-B11780 Subject: Re: [PATCH] SD/MMC: fix the issue of SDHC performance regression
Hi, On Mon, Nov 07 2011, Qiang Liu wrote: > Low performance of SDHC (half of before) due to its frequency was set > to 25MHz, but not 50MHz (involved by commit id > 013909c4ffd16ded4895528b856fd8782df04dc6, > add support for query function modes for uhs cards according to > Physical Layer SPEC V3.01). > > Set high speed max frequency according to response status of CMD6, but > not for SPEC Version. Response of switch command is first > consideration factor when set SDHC max working frequency. TRAN_SPEED > in CSD register will be seemed as the second factor. > > Signed-off-by: Qiang Liu <qiang....@freescale.com> Have you seen: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=f2815f68dabbb373fd1c9f0fd4a609d486697c2b ("mmc: sd: Handle SD3.0 cards not supporting UHS-I bus speed mode") which is already in mainline? I think your patch is identical. [Liu Qiang] Yes, they are identical. Thanks a lot. Thanks, - Chris. -- Chris Ball <c...@laptop.org> <http://printf.net/> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
