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From: Thierry Reding <thierry.reding@gmail.com>
To: Sean Paul <seanpaul@chromium.org>
Cc: dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH 01/17] drm/tegra: dc: Add powergate support
Date: Tue, 4 Nov 2014 13:34:34 +0100	[thread overview]
Message-ID: <20141104123432.GB23240@ulmo.nvidia.com> (raw)
In-Reply-To: <CAOw6vbLSeuiAk_TMGH-D-7zdkF-aqKtfeW3RxzCTdQhEyO+j-w@mail.gmail.com>


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On Mon, Nov 03, 2014 at 12:15:38PM -0500, Sean Paul wrote:
> On Mon, Nov 3, 2014 at 4:27 AM, Thierry Reding <thierry.reding@gmail.com> wrote:
> > From: Thierry Reding <treding@nvidia.com>
> >
> > Both display controllers are in their own power partition. Currently the
> > driver relies on the assumption that these partitions are on (which is
> > the hardware default). However some bootloaders may disable them, so the
> > driver must make sure to turn them back on to avoid hangs.
> >
> 
> A bug in our firmware caused the host1x block to be in a bad state on
> boot such that we had to pulse the reset control in kernel probe to
> recover. I'm not sure how paranoid you want to be here, but something
> to keep in mind.

I think I'd rather not do that. The reason is simple: eventually what
I'd like to do is implement a way for firmware to hand over display to
the kernel so we can seamlessly transition graphics. If we pulse reset
for any of the blocks we can no longer do that.

Thierry

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      reply	other threads:[~2014-11-04 12:34 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-03  9:27 [PATCH 01/17] drm/tegra: dc: Add powergate support Thierry Reding
2014-11-03  9:27 ` [PATCH 02/17] drm/tegra: Do not enable output on .mode_set() Thierry Reding
2014-11-03 17:18   ` Sean Paul
2014-11-04 14:50     ` Thierry Reding
2014-11-04 15:11       ` Sean Paul
2014-11-04 15:26         ` Thierry Reding
2014-11-04 16:38           ` Daniel Vetter
2014-11-03  9:27 ` [PATCH 03/17] drm/tegra: dsi: Make FIFO depths host parameters Thierry Reding
2014-11-03 17:20   ` Sean Paul
2014-11-04 15:45     ` Thierry Reding
2014-11-03  9:27 ` [PATCH v2 04/17] drm/tegra: dsi: Add ganged mode support Thierry Reding
2014-11-03 18:30   ` Sean Paul
2014-11-04 15:49     ` Thierry Reding
2014-11-03  9:27 ` [PATCH 05/17] drm/tegra: dsi: Set up PHY_TIMING & BTA_TIMING registers earlier Thierry Reding
2014-11-03  9:27 ` [PATCH 06/17] drm/tegra: dc: Add missing call to drm_vblank_on() Thierry Reding
2014-11-03 18:45   ` Sean Paul
2014-11-03 18:50     ` Daniel Vetter
2014-11-04 14:08     ` Thierry Reding
2014-11-04  4:21   ` Alexandre Courbot
2014-11-03  9:27 ` [PATCH 07/17] drm/tegra: gem: Extract tegra_bo_alloc_object() Thierry Reding
2014-11-03  9:27 ` [PATCH 08/17] drm/tegra: gem: Cleanup tegra_bo_create_with_handle() Thierry Reding
2014-11-03  9:27 ` [PATCH 09/17] drm/tegra: gem: Remove redundant drm_gem_free_mmap_offset() Thierry Reding
2014-11-03  9:27 ` [PATCH 10/17] drm/tegra: gem: Use dma_mmap_writecombine() Thierry Reding
2014-11-03  9:27 ` [PATCH v5 11/17] drm/tegra: Add IOMMU support Thierry Reding
2014-11-03  9:27 ` [PATCH 12/17] drm/tegra: dc: Factor out DC, window and cursor commit Thierry Reding
2014-11-03  9:27 ` [PATCH 13/17] drm/tegra: dc: Registers are 32 bits wide Thierry Reding
2014-11-03  9:27 ` [PATCH 14/17] drm/tegra: dc: Universal plane support Thierry Reding
2014-11-03  9:27 ` [PATCH 15/17] drm/tegra: Fix potential bug on driver unload Thierry Reding
2014-11-04 10:59   ` Andrzej Hajda
2014-11-04 12:30     ` Thierry Reding
2014-11-03  9:27 ` [PATCH 16/17] drm/tegra: gem: dumb: pitch and size are outputs Thierry Reding
2014-11-03  9:51   ` Daniel Vetter
2014-11-03 10:12     ` Thierry Reding
2014-11-03  9:27 ` [PATCH 17/17] drm/tegra: fb: Do not destroy framebuffer Thierry Reding
2014-11-03  9:53   ` Daniel Vetter
2014-11-04 16:08     ` Thierry Reding
2014-11-03 17:15 ` [PATCH 01/17] drm/tegra: dc: Add powergate support Sean Paul
2014-11-04 12:34   ` Thierry Reding [this message]

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