The card-present polling for 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. Changes since v2: * Fix the issue reported by Arnaud Patard: http://article.gmane.org/gmane.linux.ports.arm.kernel/120790 Changes since v1: * Rebase on today's linux-next * Take the suggestion from Arnaud Patard to add default pdata in imx_add_sdhci_esdhc_imx(), to avoid touching every single board file for the platform_data changes * Add comment for sdhci.c change * Change ESDHC_CD(WP)_SIGNAL to ESDHC_CD(WP)_CONTROLLER for a more descriptive name * Add missing NONE case handling in esdhc_pltfm_get_ro * Improve a couple comment wording per suggestion from Wolfram Sang 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 for mx5 arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c | 3 +- arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c | 3 +- arch/arm/mach-imx/mach-mx25_3ds.c | 2 + arch/arm/mach-imx/mach-pcm043.c | 2 + arch/arm/mach-mx5/board-mx51_babbage.c | 14 +- arch/arm/mach-mx5/board-mx53_loco.c | 4 + .../plat-mxc/devices/platform-sdhci-esdhc-imx.c | 12 ++ arch/arm/plat-mxc/include/mach/esdhc.h | 25 +++- drivers/mmc/host/sdhci-esdhc-imx.c | 136 ++++++++++++-------- drivers/mmc/host/sdhci.c | 27 ++++- 10 files changed, 161 insertions(+), 67 deletions(-) -- 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
