Hi Christopher,
On 03/10/2016 10:35 PM, Christopher Covington wrote:
> Version 2 of the Server Base System Architecture (SBSAv2) describes the
> Generic UART registers as 32 bits wide. At least one implementation, found
> on the Qualcomm Technologies QDF2432, only supports 32 bit accesses.
> SBSAv3, which describes supported access sizes in greater detail,
> explicitly requires support for both 16 and 32 bit accesses to all
> registers (and 8 bit accesses to some but not all). Therefore, for broad
> compatibility, simply use 32 bit accessors for the SBSA UART.
So this eliminates the need to configure SBSA port via ACPI, correct?
Thus, Aleksey can drop his "serial: pl011: use SPCR to setup 32-bit access"?
> Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
> Signed-off-by: Christopher Covington <cov@xxxxxxxxxxxxxx>
> ---
> Changes new in v2:
> * Fixed from address
> * Elaborated on forward (SBSAv3) compatibility in commit message
> * Included Mark Langsdorf's Tested-by, which now covers:
> QDF2432
> Seattle
> X-Gene 1
> ---
> drivers/tty/serial/amba-pl011.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index c0da0cc..ffb5eb8 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -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,
>
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