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tty: amba-pl011: Use 32-bit accesses for SBSA UART

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Version 2 of the Server Base System Architecture (SBSAv2) describes UART
hardware registers as 32 bits wide, giving no guidance on access sizes. The
SBSA UART driver previously assumed partial-length 16 and 8 bit accesses would
work. But the SBSAv2 UART hardware on the Qualcomm Technologies QDF2432 only
supports full-length 32 bit register accesses, so use those exclusively. This
is compatible with SBSAv3, which explicitly requires UART hardware support 32
(and 16 and sometimes 8) bit accesses.

Tested on Juno, Midway, QDF2432, Seattle, and X-Gene 1.

Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christopher Covington 2016-04-01 17:23:58 -04:00 committed by Greg Kroah-Hartman
parent 5be605ac9a
commit 1aabf523a2
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/amba-pl011.c
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@ -121,6 +121,7 @@ static struct vendor_data vendor_arm = {
static struct vendor_data vendor_sbsa = {
.reg_offset = pl011_std_offsets,
.access_32b = true,
.oversampling = false,
.dma_threshold = false,
.cts_event_workaround = false,