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Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800

From	Inki Dae <inki.dae@samsung.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800
Date	2016-06-13 03:40 +0200
Message-ID	<rJp17-7Tt-7@gated-at.bofh.it> (permalink)
References	(1 earlier) <rFBNg-71V-39@gated-at.bofh.it> <rHULM-6Am-21@gated-at.bofh.it> <rHVRv-7bV-1@gated-at.bofh.it> <rIgMh-4ht-7@gated-at.bofh.it> <rIiuJ-5BG-21@gated-at.bofh.it>
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2016년 06월 10일 09:24에 Javier Martinez Canillas 이(가) 쓴 글:
> Hello Inki,
> 
> On Thu, Jun 9, 2016 at 6:35 PM, Inki Dae <inki.dae@samsung.com> wrote:
> 
> [snip]
> 
>>> I know that removing .trg_type is enough but I also removed those lines
>>> because the fields are not used if .trg_type != I80_HW_TRG. So there is
>>> no point to leave a set for unused fields.
>>>
>>> We can latter add those one HW trigger support is fixed for Exynos5420.
>>>
>>
>> As of now, I can merge it but I think it would be not reasonable solution because potential problem still exists even we use SW trigger mode in default - ie., in case of using HW trigger mode at bootloader, same problem would happen as long as we don't support PSR mode support.
>>
> 
> Yes, I understand that the problem will show again if the bootloader
> uses HW trigger mode and that we need proper Panel Self Refresh
> support but I think that's a separate issue. That's why I said that
> those can be addressed for v4.8 but revert to SW trigger for v4.7 as a
> short term fix for the regression.
> 
> In other words, enabling HW trigger mode breaks the display for the
> Exynos5420 and Exynos5800 Peach Pi Chromebooks with the shipped
> bootloaders (which are probably the most popular Exynos5 devices with
> display and mainline support so is likely to affect users).

I thought to add PSR support somehow but put me other things to trouble.
Anyway, we could support it later so picked it up.

Thanks,
Inki Dae

> 
> Best regards,
> Javier
> 
> 
>

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[PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Javier Martinez Canillas <javier@osg.samsung.com> - 2016-06-02 16:30 +0200
  Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Inki Dae <inki.dae@samsung.com> - 2016-06-09 01:10 +0200
    Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Javier Martinez Canillas <javier@osg.samsung.com> - 2016-06-09 02:20 +0200
      Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Inki Dae <inki.dae@samsung.com> - 2016-06-10 00:40 +0200
        Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Javier Martinez Canillas <javier@dowhile0.org> - 2016-06-10 02:30 +0200
          Re: [PATCH] drm/exynos: don't use HW trigger for Exynos5420/5422/5800 Inki Dae <inki.dae@samsung.com> - 2016-06-13 03:40 +0200

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