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| author | Che-Liang Chiou <clchiou@chromium.org> | 2012-11-28 15:21:13 +0000 |
|---|---|---|
| committer | Andy Fleming <afleming@freescale.com> | 2013-05-06 16:12:38 -0500 |
| commit | e95504497ecac46907204b0ee3460b708a2981ac (patch) | |
| tree | c59e230a6096b5883c83d3399717a3408f601355 /nand_spl/nand_boot_fsl_elbc.c | |
| parent | 5ed6f447af60aabd2669d913f673793c1ce48f47 (diff) | |
| download | blackbird-obmc-uboot-e95504497ecac46907204b0ee3460b708a2981ac.tar.gz blackbird-obmc-uboot-e95504497ecac46907204b0ee3460b708a2981ac.zip | |
mmc: Split device init to decouple OCR-polling delay
Most of time that MMC driver spends on initializing a device is polling
OCR (operation conditions register). To decouple this polling loop,
device init is split into two parts: The first part fires the OCR query
command, and the second part polls the result. So the caller is now no
longer bound to the OCR-polling delay; he may fire the query, go
somewhere and then come back later for the result.
To use this, call mmc_set_preinit() on any device which needs this.
This can save significant amounts of time on boot (e.g. 200ms) by
hiding the MMC init time behind other init.
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Diffstat (limited to 'nand_spl/nand_boot_fsl_elbc.c')
0 files changed, 0 insertions, 0 deletions
