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| author | Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com> | 2018-07-17 16:24:43 +0200 |
|---|---|---|
| committer | Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com> | 2018-07-17 16:30:22 +0200 |
| commit | d239f414949916bd660c402bcaf6a56c1c90f80f (patch) | |
| tree | 638b9f0ad34adebd78c7af3197c09c4453259647 /drivers/mtd/spi-nor/spi-nor.c | |
| parent | 2218a1c837a42d9eee5348111b5e7df2b6a8ee4f (diff) | |
rk3399-puma.dts: reduce sd card max-frequency to 40MHz.
CRC errors (code -84 EILSEQ) have been observed for some SanDisk
Ultra A1 cards when running at 50MHz.
Waveform analysis suggest that the level shifters that are used on the
RK3399-Q7 module for voltage translation between 3.0 and 3.3V don't
handle clock rates at or above 48MHz properly. Back off to 40MHz for
some safety margin.
Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>
Diffstat (limited to 'drivers/mtd/spi-nor/spi-nor.c')
0 files changed, 0 insertions, 0 deletions