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authorAdrian Hunter <adrian.hunter@intel.com>2013-04-04 16:41:06 +0300
committerChris Ball <cjb@laptop.org>2013-04-12 14:08:07 -0400
commit0d3e3350d5871c53464be4c92d57198744247005 (patch)
treecca13f8eb12a397c4ea8adf9f74de3bcd7c89041 /drivers/mmc/host/mxcmmc.c
parentf9a94e0a3f18ae4c0245d4a16d0ee20e93fd7bad (diff)
downloadvexpress-lsk-0d3e3350d5871c53464be4c92d57198744247005.tar.gz
mmc: core: fix performance regression initializing MMC host controllers
Commit fa5501890d8974301042e0202d342a6cbe8609f4 introduced a performance regression by adding mmc_power_up() to mmc_start_host(). mmc_power_up() is not necessary to host controller initialization, it is part of card initialization and is performed anyway asynchronously. This patch allows a driver to leave the power up in asynchronous code (as it was before). On my current target platform this reduces driver initialization from: [ 1.313220] initcall sdhci_acpi_driver_init+0x0/0x12 returned 0 after 102008 usecs to this: [ 1.217209] initcall sdhci_acpi_driver_init+0x0/0x12 returned 0 after 8331 usecs Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/mxcmmc.c')
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