Shawn Guo <shawn.guo@xxxxxxxxxxxxx> writes: Hi, > On Fri, Jun 10, 2011 at 06:42:48PM +0800, Shawn Guo wrote: >> The card-present polling within sdhci based driver is very expensive >> in terms of the impact to system performance. We observe a few >> system performance issues from Freescale and Linaro on mx5 platforms, >> which have been proved card polling related. >> >> The patch set extends the current sdhci-esdhc-imx card_detect and >> write_protect support to cover mx5 platforms, and solves above >> performance issues. >> >> Shawn Guo (4): >> mmc: sdhci: fix interrupt storm from card detection >> mmc: sdhci-esdhc-imx: SDHCI_CARD_PRESENT does not get cleared >> mmc: sdhci-esdhc-imx: remove "WP" from flag ESDHC_FLAG_GPIO_FOR_CD_WP >> mmc: sdhci-esdhc-imx: extend card_detect and write_protect support >> > Hi Arnaud, > > Any chance to play with it yet? Finally managed to build a kernel with this version of the patchset. While I'm not polling anymore, I'm getting a lot of interrupts if the card is not inserted. Theses interrupts are not happening if the card is inserted. I can see things like this in the logs : sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000080 [ of course, the bit of the present state register indicating card presence is equal to 0 ] I've tested the SIGNAL case only. Don't know if switch to GPIO may help. Do you have same kind of issue on your side ? Thanks, Arnaud -- 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
