On Wed, Jun 15, 2011 at 12:53:18PM +0200, Wolfram Sang wrote: > Hi, > > > We are seeing issues with sdhci-esdhc-imx in 2.6.39; performance is > > not what it should be; it is about 10x lower in fact. > > Which SoC? 25/35/51/53? > > > ...any idea what this comment means? I'd like to eventualy support > > 8BITBUS... > > 8-Bit bus is not specified in the standard, so it cannot be detected. > Check other drivers where they use MMC_CAP_8_BIT_DATA. > > > Part of the problem is that esdhc_writeb_le() does translation of bits > > into breescale format; but readb() does not do translation back, and > > core code uses read-modify-write on the register, for example when > > turning on the LED. What to do there? Translate back? Add shadow > > variable? Get rid of read-modify-write? > > Probably the least ugly solution :/ > > > Any ideas why it is slow? > > Your board polls for card-detect, Shawn recently sent a series which > lets you fix that for mx5. > > ADMA is marked broken in mainline, cause it didn't work with a number of > cards. Richard sent a patch recently. > The ADMA support is recently added into Freescale BSP. IOW, the ADMA does not play on kernel "2.6.34 -with-freescale-patches" either. -- Regards, Shawn -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
