From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 06/10] drivers: PL011: replace UART_MIS reading with _RIS & _IMSC
Date: Thu, 12 Mar 2015 10:46:51 +0000 [thread overview]
Message-ID: <20150312104651.GJ8656@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1425491994-23913-7-git-send-email-andre.przywara@arm.com>
On Wed, Mar 04, 2015 at 05:59:50PM +0000, Andre Przywara wrote:
> The PL011 register UART_MIS is actually a bitwise AND of the
> UART_RIS and the UART_MISC register.
> Since the SBSA UART does not include the _MIS register, use the
> two separate registers to get the same behaviour. Since we are
> inside the spinlock and we read the _IMSC register only once, there
> should be no race issue.
Do we really need to go all the way to the hardware for this? Isn't
uap->im sufficient? Reading from memory is potentially faster as it
could be in the CPU caches.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-03-12 10:46 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-04 17:59 [PATCH v2 00/10] drivers: PL011: add ARM SBSA Generic UART support Andre Przywara
2015-03-04 17:59 ` [PATCH v2 01/10] drivers: PL011: avoid potential unregister_driver call Andre Przywara
2015-03-12 10:42 ` Russell King - ARM Linux
2015-04-08 15:39 ` Andre Przywara
2015-04-08 18:14 ` Russell King - ARM Linux
2015-03-04 17:59 ` [PATCH v2 02/10] drivers: PL011: refactor pl011_startup() Andre Przywara
2015-03-04 17:59 ` [PATCH v2 03/10] drivers: PL011: refactor pl011_shutdown() Andre Przywara
2015-03-04 17:59 ` [PATCH v2 04/10] drivers: PL011: refactor pl011_set_termios() Andre Przywara
2015-03-04 17:59 ` [PATCH v2 05/10] drivers: PL011: refactor pl011_probe() Andre Przywara
2015-03-04 17:59 ` [PATCH v2 06/10] drivers: PL011: replace UART_MIS reading with _RIS & _IMSC Andre Przywara
2015-03-12 10:46 ` Russell King - ARM Linux [this message]
2015-03-04 17:59 ` [PATCH v2 07/10] drivers: PL011: move cts_event workaround into separate function Andre Przywara
2015-03-07 3:00 ` Greg KH
2015-03-04 17:59 ` [PATCH v2 08/10] drivers: PL011: allow avoiding UART enabling/disabling Andre Przywara
2015-03-04 17:59 ` [PATCH v2 09/10] drivers: PL011: allow to supply fixed option string Andre Przywara
2015-03-04 17:59 ` [PATCH v2 10/10] drivers: PL011: add support for the ARM SBSA generic UART Andre Przywara
2015-03-09 15:59 ` Dave Martin
2015-03-12 10:52 ` Russell King - ARM Linux
2015-03-12 13:43 ` Andre Przywara
2015-03-12 13:49 ` Russell King - ARM Linux
2015-03-12 13:58 ` Andre Przywara
2015-03-07 3:01 ` [PATCH v2 00/10] drivers: PL011: add ARM SBSA Generic UART support Greg KH
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