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. Both series could need some more testing :) Regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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