From: Stephen Carlson stcarlso@linux.microsoft.com
This patch adds eMMC driver support for polling the DAT0 data connection on the Freescale LX devices and SDHCI compatible devices.
Polling until the card reports it is no longer busy increases eMMC driver performance over the default behavior, which is to wait for the worst case timeout specified by the card upon each mmc_switch operation.
This change has been tested on the Broadcom NS3 series (SDHCI) and LX2160A series (Freescale/NXP eSDHC). U-Boot boot time savings depend on the eMMC memory used, but can range from 100 to 500 ms or more.
Stephen Carlson (2): drivers: mmc: Add wait_dat0 support for Freescale eSDHC driver drivers: mmc: Add wait_dat0 support for sdhci driver
drivers/mmc/fsl_esdhc.c | 16 ++++++++++++++++ drivers/mmc/sdhci.c | 20 ++++++++++++++++++++ include/sdhci.h | 2 ++ 3 files changed, 38 insertions(+)