[PATCH 0/2] drivers: mmc: Add wait_dat0 support for more devices

stcarlso
2021-08-17T19:48:32Z

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(+)

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2.17.1