From: Stephen Boyd <sboyd@codeaurora.org>
To: Mark Brown <broonie@kernel.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>,
Lee Jones <lee.jones@linaro.org>,
Srinivas Ramana <sramana@codeaurora.org>,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] regmap: Allow regmap_bulk_write() to work for "no-bus" regmaps
Date: Thu, 26 Dec 2013 11:34:16 -0800 [thread overview]
Message-ID: <20131226193416.GI31766@codeaurora.org> (raw)
In-Reply-To: <20131224125358.GB30815@sirena.org.uk>
On 12/24, Mark Brown wrote:
> On Mon, Dec 23, 2013 at 12:05:53PM -0800, Stephen Boyd wrote:
> > On 12/18/13 10:45, Mark Brown wrote:
>
> > > This doesn't quite work - val is an array of objects of the size of the
> > > size of a register not of unsigned integers so you're parsing extra data
> > > out there. That possibly wasn't the best choice of API but we have
> > > quite a few users now so ick.
>
> > Are you concerned that we'll read past the end of the val buffer? Do we
> > need to cast the pointer to be the appropriate size according to
> > val_bytes? Something like this?
>
> That's one issue, the other is that if we try to read (say) and 8 bit
> value as an unsigned int we'll not just read the value we're looking
> for.
Ah right. My no-bus implementation was clearing out the upper 24
bits of the word so I could just send the u8 value. With this
approach that isn't necessary.
>
> > for (i = 0; i < val_count; i++) {
> > unsigned int ival;
> >
> > switch (val_bytes) {
> > case 1:
> > ival = *(u8 *)(val + (i * val_bytes));
> > break;
>
> I think we do sadly. Or refactor the API to work in unsigned ints
> which would've been more sensible in the first place but that'd make it
> asymmetrical with the read API as it stands...
Ok it sounds like you're willing to go with this updated loop.
I'll resend a proper patch.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] regmap: Allow regmap_bulk_write() to work for "no-bus" regmaps
Date: Thu, 26 Dec 2013 11:34:16 -0800 [thread overview]
Message-ID: <20131226193416.GI31766@codeaurora.org> (raw)
In-Reply-To: <20131224125358.GB30815@sirena.org.uk>
On 12/24, Mark Brown wrote:
> On Mon, Dec 23, 2013 at 12:05:53PM -0800, Stephen Boyd wrote:
> > On 12/18/13 10:45, Mark Brown wrote:
>
> > > This doesn't quite work - val is an array of objects of the size of the
> > > size of a register not of unsigned integers so you're parsing extra data
> > > out there. That possibly wasn't the best choice of API but we have
> > > quite a few users now so ick.
>
> > Are you concerned that we'll read past the end of the val buffer? Do we
> > need to cast the pointer to be the appropriate size according to
> > val_bytes? Something like this?
>
> That's one issue, the other is that if we try to read (say) and 8 bit
> value as an unsigned int we'll not just read the value we're looking
> for.
Ah right. My no-bus implementation was clearing out the upper 24
bits of the word so I could just send the u8 value. With this
approach that isn't necessary.
>
> > for (i = 0; i < val_count; i++) {
> > unsigned int ival;
> >
> > switch (val_bytes) {
> > case 1:
> > ival = *(u8 *)(val + (i * val_bytes));
> > break;
>
> I think we do sadly. Or refactor the API to work in unsigned ints
> which would've been more sensible in the first place but that'd make it
> asymmetrical with the read API as it stands...
Ok it sounds like you're willing to go with this updated loop.
I'll resend a proper patch.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2013-12-26 19:34 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-10 23:35 [PATCH 0/8] Modernize pm8921 with irqdomains + regmap Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-10 23:35 ` [PATCH 1/8] mfd: ssbi: Remove platform data structs and hide ssbi type enum Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:27 ` Lee Jones
2013-12-11 9:27 ` Lee Jones
2013-12-10 23:35 ` [PATCH 2/8] mfd: ssbi: Constify buffer in ssbi_write Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:28 ` Lee Jones
2013-12-11 9:28 ` Lee Jones
2013-12-10 23:35 ` [PATCH 3/8] regmap: Add support for using regmap over ssbi Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-10 23:50 ` Mark Brown
2013-12-10 23:50 ` Mark Brown
2013-12-11 0:13 ` Stephen Boyd
2013-12-11 0:13 ` Stephen Boyd
2013-12-11 0:51 ` Mark Brown
2013-12-11 0:51 ` Mark Brown
2013-12-11 1:32 ` Stephen Boyd
2013-12-11 1:32 ` Stephen Boyd
2013-12-11 13:27 ` Mark Brown
2013-12-11 13:27 ` Mark Brown
2013-12-12 23:13 ` Stephen Boyd
2013-12-12 23:13 ` Stephen Boyd
2013-12-13 10:41 ` Mark Brown
2013-12-13 10:41 ` Mark Brown
2013-12-13 17:14 ` [PATCH] regmap: Allow regmap_bulk_read() to work for "no-bus" regmaps Stephen Boyd
2013-12-13 17:14 ` Stephen Boyd
2013-12-13 17:14 ` Stephen Boyd
2013-12-16 20:57 ` Mark Brown
2013-12-16 20:57 ` Mark Brown
2013-12-13 21:37 ` [PATCH 3/8] regmap: Add support for using regmap over ssbi Stephen Boyd
2013-12-13 21:37 ` Stephen Boyd
2013-12-16 21:01 ` Mark Brown
2013-12-16 21:01 ` Mark Brown
2013-12-17 2:30 ` [PATCH] regmap: Allow regmap_bulk_write() to work for "no-bus" regmaps Stephen Boyd
2013-12-17 2:30 ` Stephen Boyd
2013-12-18 18:45 ` Mark Brown
2013-12-18 18:45 ` Mark Brown
2013-12-23 20:05 ` Stephen Boyd
2013-12-23 20:05 ` Stephen Boyd
2013-12-24 12:53 ` Mark Brown
2013-12-24 12:53 ` Mark Brown
2013-12-26 19:34 ` Stephen Boyd [this message]
2013-12-26 19:34 ` Stephen Boyd
2013-12-26 21:52 ` [PATCH v2] " Stephen Boyd
2013-12-26 21:52 ` Stephen Boyd
2013-12-30 12:42 ` Mark Brown
2013-12-30 12:42 ` Mark Brown
2013-12-10 23:35 ` [PATCH 4/8] mfd: ssbi: Mark match table const Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:29 ` Lee Jones
2013-12-11 9:29 ` Lee Jones
2013-12-10 23:35 ` [PATCH 5/8] mfd: Move pm8xxx-irq.c contents into only driver that uses it Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:35 ` Lee Jones
2013-12-11 9:35 ` Lee Jones
2013-12-12 19:06 ` Stephen Boyd
2013-12-12 19:06 ` Stephen Boyd
2013-12-10 23:35 ` [PATCH 6/8] mfd: pm8921: Update for genirq changes Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:48 ` Lee Jones
2013-12-11 9:48 ` Lee Jones
2013-12-10 23:35 ` [PATCH 7/8] mfd: pm8921: Migrate to irqdomains Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:53 ` Lee Jones
2013-12-11 9:53 ` Lee Jones
2013-12-11 21:30 ` Courtney Cavin
2013-12-11 21:30 ` Courtney Cavin
2013-12-12 19:05 ` Stephen Boyd
2013-12-12 19:05 ` Stephen Boyd
2013-12-10 23:35 ` [PATCH 8/8] mfd: pm8921: Use ssbi regmap Stephen Boyd
2013-12-10 23:35 ` Stephen Boyd
2013-12-11 9:55 ` Lee Jones
2013-12-11 9:55 ` Lee Jones
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