From: eric.nelson@boundarydevices.com (Eric Nelson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/6] staging: drm/imx: Add i.MX IPUv3 crtc support
Date: Sat, 22 Sep 2012 10:52:12 -0700 [thread overview]
Message-ID: <505DFACC.7010604@boundarydevices.com> (raw)
In-Reply-To: <20120922101727.GG1322@pengutronix.de>
On 09/22/2012 03:17 AM, Sascha Hauer wrote:
> Hi Eric,
>
> On Fri, Sep 21, 2012 at 09:24:19AM -0700, Eric Nelson wrote:
>> Hi Sascha,
>>
>>
>> But ipu_crtc->imx_crtc gets initialized in this call, and
>> ipu_irq_handler() makes use of it.
>>
>> The U-Boot code doesn't enable interrupts, so it's not acking
>> along the way, and leaves bits set in IPU1_INT_STAT_15.
>>
>> I found that I can get around this in U-Boot by disabling the
>> LCD controller and acking all of the interrupts after disabling
>> the controller, but I haven't yet figured out where to tap into
>> cleanup_before_linux().
>
> Passing over an enabled IPU from the bootloader to the kernel is
> (currently) not a supported usecase, so U-Boot should indeed disable it.
> That said, the kernel driver should make sure the IPU is sufficiently
> configured before the interrupts are enabled, so this seems to be a bug
> that deserves fixing.
>
Thanks Sascha,
Patches for U-Boot are in process.
http://lists.denx.de/pipermail/u-boot/2012-September/134807.html
Regards,
Eric
next prev parent reply other threads:[~2012-09-22 17:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 8:07 [PATCH] Add i.MX IPUv3 base/KMS driver to the staging tree Sascha Hauer
2012-09-21 8:07 ` [PATCH 1/6] staging: drm/imx: Add i.MX drm core support Sascha Hauer
2012-09-21 8:07 ` [PATCH 2/6] staging: drm/imx: Add parallel display support Sascha Hauer
2012-09-21 8:07 ` [PATCH 3/6] staging: drm/imx: add i.MX IPUv3 base driver Sascha Hauer
2012-09-21 8:07 ` [PATCH 4/6] staging: drm/imx: Add i.MX IPUv3 crtc support Sascha Hauer
2012-09-21 16:24 ` Eric Nelson
2012-09-22 10:17 ` Sascha Hauer
2012-09-22 17:52 ` Eric Nelson [this message]
2012-09-21 8:07 ` [PATCH 5/6] staging: drm/imx: Add devicetree binding documentation Sascha Hauer
2012-09-21 8:07 ` [PATCH 6/6] staging: drm/imx: Add TODO Sascha Hauer
2012-09-21 16:18 ` [PATCH] Add i.MX IPUv3 base/KMS driver to the staging tree Greg Kroah-Hartman
-- strict thread matches above, loose matches on Subject: below --
2012-09-12 10:31 Sascha Hauer
2012-09-12 10:31 ` [PATCH 4/6] staging: drm/imx: Add i.MX IPUv3 crtc support Sascha Hauer
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