From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Timur Tabi <timur@freescale.com>
Cc: alsa-devel@alsa-project.org,
Sergei Shtylyov <sshtylyov@ru.mvista.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Shawn Guo <shawn.guo@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 4/4] ASoC: fsl: make fsl_ssi driver compilable on ARM/IMX
Date: Fri, 24 Feb 2012 23:28:52 +0000 [thread overview]
Message-ID: <20120224232851.GF15120@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <4F481BA6.7050705@freescale.com>
On Fri, Feb 24, 2012 at 05:22:14PM -0600, Timur Tabi wrote:
> Russell King - ARM Linux wrote:
> > What would be wrong with converting in_be32() in these drivers to
> > instead ioread32be()?
>
> Well, it wouldn't actually fix any problems. It's just a stylistic
> change for PowerPC. On ARM, however, ioread32be() is wrong because the
> SSI registers are little-endian.
So, to go around the loop a little further: to make this driver work
_unaltered_ on ARM, we'd need an in_32be() that read the register
_without_ doing the byte swapping.
But then, such an implementation of in_32be() would be absurd because
it's not doing what it says.
So, the driver needs to change its accessor method. There is no
accessor in existance at present which does the right thing.
And then I went on to explain that there's more complicated cases too,
where it seems that in theory you can end up with the same IP connected
in BE mode and sitting behind a PCI bus, which presents the need for
accessors which know the bus type by some means.
next prev parent reply other threads:[~2012-02-24 23:29 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-23 6:47 [PATCH 1/4] ASoC: imx: let SND_MXC_SOC_FIQ select FIQ Shawn Guo
2012-02-23 6:47 ` [PATCH 2/4] ASoC: imx: move SND_SOC_AC97_BUS selection down to machine driver Shawn Guo
2012-02-23 6:47 ` [PATCH 3/4] ASoC: imx: initialize dma_params burstsize just in imx-ssi Shawn Guo
2012-02-23 6:47 ` [PATCH 4/4] ASoC: imx: separate imx-pcm bits from imx-ssi driver Shawn Guo
2012-02-23 14:48 ` [PATCH 0/4] ASoC: merge imx into fsl Shawn Guo
2012-02-23 14:48 ` [PATCH 1/4] ASoC: imx: add an explicit Kconfig option for imx-ssi driver Shawn Guo
2012-02-23 15:40 ` Timur Tabi
2012-02-24 1:28 ` Shawn Guo
2012-02-24 2:59 ` Tabi Timur-B04825
2012-02-24 3:37 ` Shawn Guo
2012-02-23 14:48 ` [PATCH 2/4] ASoC: fsl: separate SSI and DMA Kconfig options Shawn Guo
2012-02-23 14:48 ` [PATCH 3/4] ASoC: imx: merge sound/soc/imx into sound/soc/fsl Shawn Guo
2012-02-23 14:48 ` [PATCH 4/4] ASoC: fsl: make fsl_ssi driver compilable on ARM/IMX Shawn Guo
2012-02-23 15:24 ` Sergei Shtylyov
2012-02-23 15:44 ` Timur Tabi
2012-02-23 16:52 ` Russell King - ARM Linux
2012-02-23 17:04 ` Timur Tabi
2012-02-23 17:14 ` Russell King - ARM Linux
2012-02-23 19:01 ` Trent Piepho
2012-02-24 21:29 ` Timur Tabi
2012-02-24 21:54 ` Russell King - ARM Linux
2012-02-24 22:00 ` Timur Tabi
2012-02-24 22:35 ` Russell King - ARM Linux
2012-02-24 23:05 ` Timur Tabi
2012-02-24 23:15 ` Russell King - ARM Linux
2012-02-24 23:22 ` Timur Tabi
2012-02-24 23:28 ` Russell King - ARM Linux [this message]
2012-02-24 23:38 ` Timur Tabi
2012-02-24 14:09 ` [PATCH 0/6] ASoC: a few cleanups on sound/soc/fsl Shawn Guo
2012-02-24 14:02 ` Mark Brown
2012-02-24 14:23 ` Shawn Guo
2012-02-24 14:17 ` Mark Brown
2012-02-24 23:21 ` Shawn Guo
2012-02-24 23:14 ` Timur Tabi
2012-02-25 0:03 ` Shawn Guo
2012-02-25 1:39 ` Tabi Timur-B04825
2012-02-25 10:17 ` Russell King - ARM Linux
2012-02-25 11:44 ` Mark Brown
2012-02-25 12:12 ` Russell King - ARM Linux
2012-02-25 13:58 ` Mark Brown
2012-02-25 12:16 ` Shawn Guo
2012-02-24 23:23 ` Russell King - ARM Linux
2012-02-25 0:06 ` Shawn Guo
2012-02-24 14:09 ` [PATCH 1/6] ASoC: fsl: correct get_dma_channel parameter name Shawn Guo
2012-02-27 20:27 ` Timur Tabi
2012-02-28 12:34 ` Mark Brown
2012-02-24 14:09 ` [PATCH 2/6] ASoC: fsl: align mpc8610_hpcd with p1022_ds on getting codec node Shawn Guo
2012-02-27 20:31 ` Timur Tabi
2012-02-28 12:35 ` Mark Brown
2012-02-24 14:09 ` [PATCH 3/6] ASoC: Remove unnecessary -codec from cs4270 driver name Shawn Guo
2012-02-27 21:21 ` Timur Tabi
2012-02-28 12:35 ` Mark Brown
2012-02-24 14:09 ` [PATCH 4/6] ASoC: fsl: create fsl_utils to accommodate the common functions Shawn Guo
2012-02-27 18:15 ` Timur Tabi
2012-02-27 21:36 ` Timur Tabi
2012-02-28 2:15 ` Shawn Guo
2012-02-28 2:15 ` Tabi Timur-B04825
2012-02-28 16:51 ` Timur Tabi
2012-02-24 14:09 ` [PATCH 5/6] ASoC: fsl: use platform_device_id table to match p1022_ds device Shawn Guo
2012-02-27 21:39 ` Timur Tabi
2012-02-27 21:39 ` Timur Tabi
2012-02-28 1:52 ` Shawn Guo
2012-02-24 14:09 ` [PATCH 6/6] ASoC: fsl: check property 'compatible' for the machine name Shawn Guo
2012-02-24 14:12 ` Mark Brown
2012-02-24 16:30 ` Timur Tabi
2012-02-25 0:09 ` Shawn Guo
2012-02-25 11:39 ` Mark Brown
2012-02-25 1:28 ` Shawn Guo
2012-02-25 11:42 ` Mark Brown
2012-02-25 13:09 ` Shawn Guo
2012-02-25 13:27 ` Mark Brown
2012-02-25 14:03 ` Tabi Timur-B04825
2012-02-24 16:32 ` Timur Tabi
2012-02-24 23:23 ` Shawn Guo
2012-02-24 23:22 ` Timur Tabi
2012-02-27 21:54 ` Timur Tabi
2012-02-28 1:50 ` Shawn Guo
2012-02-28 2:12 ` Tabi Timur-B04825
2012-02-28 3:13 ` Shawn Guo
2012-02-28 3:42 ` Tabi Timur-B04825
2012-02-28 5:35 ` Shawn Guo
2012-02-27 20:28 ` [PATCH 0/6] ASoC: a few cleanups on sound/soc/fsl Timur Tabi
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