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| /rk3399_rockchip-uboot/drivers/spi/ |
| H A D | spi-uclass.c | 0962b023d2d6ce91e09d5793aec36770a6bfec1e Thu Nov 21 04:38:47 UTC 2019 Marcin Wojtas <mw@semihalf.com> UPSTREAM: spi: prevent overriding established bus settings
The SPI stack relies on a proper bus speed/mode configuration
by calling dm_spi_claim_bus(). However the hitherto code
allowed to accidentally override those settings in
the spi_get_bus_and_cs() routine.
The initially established speed could be discarded by using
the slave platdata, which turned out to be an issue on
the platforms whose slave maximum supported frequency
is not on par with the maximum frequency of the bus controller.
This patch fixes above issue by configuring the bus from
spi_get_bus_and_cs() only in case it was not done before.
Change-Id: I7b8268046ae5e086de8dd456a5e13ba8b7dc0f5c
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit f7dd5370986087af9b9cfa601f34b344ec910b87)
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