From: Oleksandr Tyshchenko <oleksandr.tyshchenko@globallogic.com>
To: Dirk Behme <dirk.behme@de.bosch.com>
Cc: xen-devel@lists.xenproject.org,
Julien Grall <julien.grall@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Iurii Konovalenko <iurii.konovalenko@globallogic.com>
Subject: Re: [PATCH 1/3] xen/arm: drivers: scif: Remove dead code
Date: Tue, 21 Jun 2016 13:16:48 +0300 [thread overview]
Message-ID: <CAJEb2DECA5mOrgpyiE0CfX-_unBXYm4Ke90iGSPEeUQoCqQD-A@mail.gmail.com> (raw)
In-Reply-To: <1466500528-8411-1-git-send-email-dirk.behme@de.bosch.com>
Hi, Dirk.
On Tue, Jun 21, 2016 at 12:15 PM, Dirk Behme <dirk.behme@de.bosch.com> wrote:
> In scif_uart_init() uart->baud is set to BAUD_AUTO. So its a basic error
> if this is different later. Detect this by an ASSERT, but remove the
> dead code normally never reached.
>
> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
> ---
> xen/drivers/char/scif-uart.c | 23 ++++++-----------------
> 1 file changed, 6 insertions(+), 17 deletions(-)
>
> diff --git a/xen/drivers/char/scif-uart.c b/xen/drivers/char/scif-uart.c
> index 51a2233..ca88c0f 100644
> --- a/xen/drivers/char/scif-uart.c
> +++ b/xen/drivers/char/scif-uart.c
> @@ -143,23 +143,12 @@ static void __init scif_uart_init_preirq(struct serial_port *port)
> scif_writew(uart, SCIF_SCSMR, val);
>
> ASSERT( uart->clock_hz > 0 );
> - if ( uart->baud != BAUD_AUTO )
> - {
> - /* Setup desired Baud rate */
> - divisor = uart->clock_hz / (uart->baud << 4);
> - ASSERT( divisor >= 1 && divisor <= (uint16_t)UINT_MAX );
> - scif_writew(uart, SCIF_DL, (uint16_t)divisor);
> - /* Selects the frequency divided clock (SC_CLK external input) */
> - scif_writew(uart, SCIF_CKS, 0);
> - udelay(1000000 / uart->baud + 1);
This part of code might be used for people who are not satisfied with
default baudrate which has been set in U-Boot.
If we remove this we will take away the opportunity to just change
uart->baud from BAUD_AUTO to desired one.
> - }
> - else
> - {
> - /* Read current Baud rate */
> - divisor = scif_readw(uart, SCIF_DL);
> - ASSERT( divisor >= 1 && divisor <= (uint16_t)UINT_MAX );
> - uart->baud = uart->clock_hz / (divisor << 4);
> - }
> + ASSERT( uart->baud == BAUD_AUTO );
> +
> + /* Read current Baud rate */
> + divisor = scif_readw(uart, SCIF_DL);
> + ASSERT( divisor >= 1 && divisor <= (uint16_t)UINT_MAX );
> + uart->baud = uart->clock_hz / (divisor << 4);
>
> /* Setup trigger level for TX/RX FIFOs */
> scif_writew(uart, SCIF_SCFCR, SCFCR_RTRG11 | SCFCR_TTRG11);
> --
> 2.8.0
>
--
Oleksandr Tyshchenko | Embedded Dev
GlobalLogic
www.globallogic.com
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next prev parent reply other threads:[~2016-06-21 10:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-21 9:15 [PATCH 1/3] xen/arm: drivers: scif: Remove dead code Dirk Behme
2016-06-21 9:15 ` [PATCH 2/3] xen/arm: drivers: scif: Remove unused variables Dirk Behme
2016-06-21 12:17 ` Julien Grall
2016-06-21 9:15 ` [PATCH 3/3] xen/arm: drivers: scif: Add clock auto detection Dirk Behme
2016-06-21 12:20 ` Julien Grall
2016-06-21 12:30 ` Dirk Behme
2016-06-21 12:33 ` Julien Grall
2016-06-21 10:16 ` Oleksandr Tyshchenko [this message]
2016-06-21 12:15 ` [PATCH 1/3] xen/arm: drivers: scif: Remove dead code Julien Grall
2016-06-21 12:54 ` Oleksandr Tyshchenko
2016-06-21 13:01 ` Dirk Behme
2016-06-21 13:22 ` Oleksandr Tyshchenko
2016-06-21 13:07 ` Julien Grall
2016-06-21 13:11 ` Oleksandr Tyshchenko
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