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Groups > linux.kernel > #1363319
| From | Mark Brown <broonie@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: regmap: mmio: regression in pre-v4.6-rc1 |
| Date | 2016-03-23 11:40 +0100 |
| Message-ID | <rfOmK-22n-13@gated-at.bofh.it> (permalink) |
| References | <rfMEi-Or-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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On Wed, Mar 23, 2016 at 09:48:42AM +0100, Alexander Stein wrote:
Please fix your mail client to word wrap within paragraphs at something
substantially less than 80 columns. Doing this makes your messages much
easier to read and reply to.
> I'm currently trying to get PCIe working on LS1021A (little-endian
> ARM). For link-detection I need access to a syscon perpheral (SCFG)
> which is attched to CPU as big-endian.
Are you *sure* that this is actually big endian? Are you basing this on
documentation or on what happened to work for you in the past.
> Based on current linus's master (a24e3d414e59ac765, "Merge branch
> 'akpm' (patches from Andrew)") I noticed the access is actually done
> as little-endian. I could track it down to commit 922a9f936e40001f
> ("regmap: mmio: Convert to regmap_bus and fix accessor usage").
> Reverting it, the access is fine now and I get my PCIe link.
Have you tried tracing through the code to see what ends up happening to
the I/O? It should come out using your architecture's big endian
accessors.
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regmap: mmio: regression in pre-v4.6-rc1 Alexander Stein <alexander.stein@systec-electronic.com> - 2016-03-23 09:50 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Alexander Stein <alexander.stein@systec-electronic.com> - 2016-03-23 10:50 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Mark Brown <broonie@kernel.org> - 2016-03-23 11:40 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Alexander Stein <alexander.stein@systec-electronic.com> - 2016-03-23 12:20 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Mark Brown <broonie@kernel.org> - 2016-03-23 12:40 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Alexander Stein <alexander.stein@systec-electronic.com> - 2016-03-23 13:00 +0100
Re: regmap: mmio: regression in pre-v4.6-rc1 Mark Brown <broonie@kernel.org> - 2016-03-23 13:10 +0100
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