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| H A D | designware_spi.c | ba102646eacea44db69c8fdb2f51b9e94a59129e Thu Mar 22 10:50:47 UTC 2018 Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> UPSTREAM: DW SPI: use 32 bit access instead of 16 and 32 bit mix
Current DW SPI driver uses 32 bit access for some registers and
16 bit access for others. So if DW SPI IP is connected via bus
which doesn't support 16 bit access we will get bus error.
Fix that by switching to 32 bit access only instead of 16 and 32 bit mix
Additional Documentation to Support this Change:
The DW_apb_ssi databook states:
"All registers in the DW_apb_ssi are addressed at 32-bit boundaries
to remain consistent with the AHB bus. Where the physical size of
any register is less than 32-bits wide, the upper unused bits of
the 32-bit boundary are reserved. Writing to these bits has no
effect; reading from these bits returns 0." [1]
[1] Section 6.1 of dw_apb_ssi.pdf (version 3.22a)
Change-Id: I3e52a45a49f96177d1c0d3781d8d98d7df5d9e0c
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 4b5f6c52e78d43710a0d062e31de741ec76ceea1)
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