linux-kernel - Re: [PATCH 2/2] regmap: mmio: Parse endianness definitions from DT

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Date:	Thu, 31 Mar 2016 15:09:16 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] regmap: mmio: Parse endianness definitions from DT

On Wed, Mar 30, 2016 at 4:41 AM, Mark Brown <broonie@...nel.org> wrote:
> Since we changed to do formatting in the bus we now skip all the format
> parsing that the core does for its data marshalling code.  This means
> that we skip the DT parsing it does which breaks some systems, we need
> to add an explict call in the MMIO code to do this.
>
> Reported-by: Alexander Stein <alexander.stein@...tec-electronic.com>
> Signed-off-by: Mark Brown <broonie@...nel.org>

This breaks my syscon reboot handler (Exynos4412, Trats2):
###############
-sh-4.1# reboot
Rebooting.
[   37.056210] reboot: Restarting system
[   38.058649] Unable to restart system
[   39.060987] Reboot failed -- System halted
###############

I added a printk before switch and:
config->val_format_endian: REGMAP_ENDIAN_DEFAULT
regmap_get_val_endian(): REGMAP_ENDIAN_BIG,

so this not entirely backward compatible... but of course maybe my DT
config needs some fixes...

Below bisect status:
# bad: [3fdbce4cc3e9f3f3c59046b96d3f5ac72b37ba22] Add linux-next
specific files for 20160331
# good: [62f444e0548eb503b42c8447675b468f5cf40c69] Merge branch
'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
git bisect start 'HEAD' 'next/stable'
# good: [5db649ad8967952294445dc9006078a305f9ac88] Merge
remote-tracking branch 'nand/nand/next'
git bisect good 5db649ad8967952294445dc9006078a305f9ac88
# bad: [7936113e7237d075597aac5171b11dfe4f6c49a3] Merge
remote-tracking branch 'usb-chipidea-next/ci-for-usb-next'
git bisect bad 7936113e7237d075597aac5171b11dfe4f6c49a3
# bad: [6d1f8fb2e0ed9f85e5121b021d19b9e135fbea54] Merge
remote-tracking branch 'sound/for-next'
git bisect bad 6d1f8fb2e0ed9f85e5121b021d19b9e135fbea54
# good: [432f856d8b4963f2f1d95844794266d7c9a9ca97] drm/i915: Split out
load time interface registration
git bisect good 432f856d8b4963f2f1d95844794266d7c9a9ca97
# good: [a16b7658f4e0d4aec9bc3e75a5f0cc3f7a3a0422] drm/i915: Call
intel_dp_mst_resume() before resuming displays
git bisect good a16b7658f4e0d4aec9bc3e75a5f0cc3f7a3a0422
# good: [0b7c2ce88d7c26623df086a46afb966805992662] Merge
remote-tracking branch 'hdlcd/for-upstream/hdlcd'
git bisect good 0b7c2ce88d7c26623df086a46afb966805992662
# bad: [d5f9fa5b25846a620ce1893e659e137b48325bef] Merge
remote-tracking branch 'regmap/for-next'
git bisect bad d5f9fa5b25846a620ce1893e659e137b48325bef
# good: [2468fc97cc4555c37fa491379c98561b30c739f3] Merge branch
'kbuild/kbuild' into kbuild/for-next
git bisect good 2468fc97cc4555c37fa491379c98561b30c739f3
# bad: [51a1944f6b46b61bd0e2a58410ff91a5f6c9361c] Merge
remote-tracking branches 'regmap/fix/be' and 'regmap/fix/doc' into
regmap-linus
git bisect bad 51a1944f6b46b61bd0e2a58410ff91a5f6c9361c
# good: [4f7d6dd4df8b388e2056c89b528254cdd79dea2a] regmap: Fix
implicit inclusion of device.h
git bisect good 4f7d6dd4df8b388e2056c89b528254cdd79dea2a
# good: [2596e07a3ed5a5f4d8b89be316c2b704d6f5dc5f] regmap: fix
documentation to match code
git bisect good 2596e07a3ed5a5f4d8b89be316c2b704d6f5dc5f
# bad: [0dbdb76c0ca8e7caf27c9a210f64c4359e2974a4] regmap: mmio: Parse
endianness definitions from DT
git bisect bad 0dbdb76c0ca8e7caf27c9a210f64c4359e2974a4
# first bad commit: [0dbdb76c0ca8e7caf27c9a210f64c4359e2974a4] regmap:
mmio: Parse endianness definitions from DT

Best regards,
Krzysztof