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From: Thierry Reding <thierry.reding@gmail.com>
To: Dave Airlie <airlied@gmail.com>
Cc: "Stéphane Marchesin" <marcheu@chromium.org>,
	dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH v2 12/26] drm/exynos: Split manager/display/subdrv
Date: Mon, 4 Nov 2013 11:08:19 +0100	[thread overview]
Message-ID: <20131104100818.GH27445@ulmo.nvidia.com> (raw)
In-Reply-To: <CAPM=9tyMQMizzzWqroigVw+z97M3aZfxqxxkoRrFj4Cqyby1kQ@mail.gmail.com>


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On Wed, Oct 23, 2013 at 04:22:11PM +0100, Dave Airlie wrote:
> On Wed, Oct 23, 2013 at 3:45 PM, Sean Paul <seanpaul@chromium.org> wrote:
> > On Wed, Oct 23, 2013 at 10:29 AM, Dave Airlie <airlied@gmail.com> wrote:
> >>> As I mentioned earlier, display_ops is needed to have no any
> >>> dependency of drm framework directly like below,
> >>>
> >>>                                           DRM Framework
> >>>                                                        |
> >>>                                         Exynos DRM Framework
> >>>                                                     /   |   \
> >>>                                          Real device drivers
> >>>
> >>> In particular, in case of ARM based DRM drivers with separated
> >>> devices, I still tend to think it's better design than that device
> >>> drivers implement the connector callbacks directly, but I will try to
> >>> consider what is the better way.
> >>>
> >>
> >> I think we need to start considering a framework where subdrivers just
> >> add drm objects themselves, then the toplevel node is responsible for
> >> knowing that everything for the current configuration is loaded.
> >>
> >
> > It would be nice to specify the various pieces in dt, then have some
> > type of drm notifier to the toplevel node when everything has been
> > probed. Doing it in the dt would allow standalone drm_bridge/drm_panel
> > drivers to be transparent as far as the device's drm driver is
> > concerned.
> >
> > Sean
> >
> >
> >> I realise we may need to make changes to the core drm to allow this
> >> but we should probably start to create a strategy for fixing the API
> >> issues that this throws up.
> >>
> >> Note I'm not yet advocating for dynamic addition of nodes once the
> >> device is in use, or removing them.
> >>
> 
> I do wonder if we had some sort of tag in the device tree for any nodes
> involved in the display, and the core drm layer would read that list,
> and when every driver registers tick things off, and when the last one
> joins we get a callback and init the drm layer, we'd of course have the
> basic drm layer setup prior to that so we can add the objects as the
> drivers load. It might make development a bit trickier as you'd need
> to make sure someone claimed ownership of all the bits for init to proceed.

I'm curious whether anyone actually ever bothered to look at the Tegra
driver. It pretty much does all of this already.

Granted the hardware may be more friendly than on most other SoCs, but
essentially the problem is the same.

Thierry

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  parent reply	other threads:[~2013-11-04 10:08 UTC|newest]

Thread overview: 93+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-16 19:26 [PATCH v2 00/26] drm/exynos: Refactor parts of the exynos driver Sean Paul
2013-10-16 19:26 ` [PATCH v2 01/26] drm/exynos: Remove useless slab.h include Sean Paul
2013-10-16 19:26 ` [PATCH v2 02/26] drm/exynos: Merge overlay_ops into manager_ops Sean Paul
2013-10-16 19:26 ` [PATCH v2 03/26] drm/exynos: Add an initialize function to manager and display Sean Paul
2013-10-16 19:26 ` [PATCH v2 04/26] drm/exynos: Use manager_op initialize in fimd Sean Paul
2013-10-16 19:26 ` [PATCH v2 05/26] drm/exynos: hdmi: Implement initialize op for hdmi Sean Paul
2013-10-16 19:26 ` [PATCH v2 06/26] drm/exynos: Pass exynos_drm_manager in manager ops instead of dev Sean Paul
2013-10-16 19:26 ` [PATCH v2 07/26] drm/exynos: Remove apply manager callback Sean Paul
2013-10-16 19:26 ` [PATCH v2 08/26] drm/exynos: Remove dpms link between encoder/connector Sean Paul
2013-10-16 19:26 ` [PATCH v2 09/26] drm/exynos: Rename display_op power_on to dpms Sean Paul
2013-10-16 19:26 ` [PATCH v2 10/26] drm/exynos: Don't keep dpms state in encoder Sean Paul
2013-10-16 19:26 ` [PATCH v2 11/26] drm/exynos: Use unsigned long for possible_crtcs Sean Paul
2013-10-16 19:26 ` [PATCH v2 12/26] drm/exynos: Split manager/display/subdrv Sean Paul
2013-10-17  8:21   ` Inki Dae
2013-10-17 14:37     ` Sean Paul
2013-10-18  2:31       ` Inki Dae
2013-10-21 14:46         ` Sean Paul
2013-10-21 21:17           ` Sean Paul
2013-10-22  5:30             ` Inki Dae
2013-10-22 13:45               ` Sean Paul
2013-10-23  2:28                 ` Inki Dae
2013-10-23  2:40                   ` Stéphane Marchesin
2013-10-23  3:38                     ` Inki Dae
2013-10-23  4:03                       ` Stéphane Marchesin
2013-10-23  4:15                         ` Inki Dae
2013-10-23  4:28                           ` Stéphane Marchesin
2013-10-23  4:48                             ` Inki Dae
2013-10-23  5:19                               ` Sean Paul
2013-10-23  5:42                                 ` Inki Dae
2013-10-23 12:20                                   ` Sean Paul
2013-10-23 13:18                                     ` Inki Dae
2013-10-23 14:29                                       ` Dave Airlie
2013-10-23 14:45                                         ` Sean Paul
2013-10-23 15:22                                           ` Dave Airlie
2013-10-23 15:27                                             ` Rob Clark
2013-10-23 15:27                                             ` Sean Paul
2013-10-23 15:28                                               ` Sean Paul
2013-10-23 15:53                                               ` Dave Airlie
2013-10-23 16:09                                                 ` Sean Paul
2013-10-28 16:49                                                   ` Olof Johansson
2013-10-28 17:39                                                     ` Sean Paul
2013-10-28 23:13                                                   ` Tomasz Figa
2013-10-29 19:19                                                     ` Olof Johansson
2013-10-29 19:23                                                       ` Tomasz Figa
2013-10-29 19:47                                                         ` Sylwester Nawrocki
2013-10-29 23:08                                                           ` Laurent Pinchart
2013-10-29 20:36                                                     ` Sean Paul
2013-10-29 20:50                                                       ` Tomasz Figa
2013-10-29 21:29                                                         ` Rob Clark
2013-10-29 23:32                                                           ` Laurent Pinchart
2013-11-04 10:21                                                             ` Thierry Reding
2013-11-04 10:10                                                           ` Thierry Reding
2013-11-04 12:14                                                             ` Rob Clark
2013-11-04 12:52                                                               ` Thierry Reding
2013-11-04 16:12                                                                 ` Daniel Vetter
2013-10-30  3:46                                                         ` Stéphane Marchesin
2013-11-04 10:25                                                           ` Thierry Reding
2013-11-04 11:30                                                             ` Inki Dae
2013-11-04 15:44                                                               ` Sean Paul
2013-11-05  7:38                                                                 ` Inki Dae
2013-10-30 15:32                                                         ` Sean Paul
2013-10-30 15:45                                                           ` Laurent Pinchart
2013-10-30 15:56                                                             ` Sean Paul
2013-11-04 10:12                                                               ` Laurent Pinchart
2013-10-30 15:53                                                           ` Daniel Vetter
2013-11-04 10:13                                                             ` Laurent Pinchart
2013-11-04 10:36                                                           ` Thierry Reding
2013-11-04 10:08                                             ` Thierry Reding [this message]
2013-10-24  6:47                                           ` Inki Dae
2013-10-23 14:51                                       ` Rob Clark
2013-10-24  7:46                                         ` Inki Dae
2013-10-25  5:15                                           ` Inki Dae
2013-10-28 20:43                                           ` Rob Clark
2013-10-23  3:39                   ` Sean Paul
2013-10-22  4:55           ` Inki Dae
2013-10-22 10:30   ` Inki Dae
2013-10-23  5:18     ` Inki Dae
2013-10-16 19:26 ` [PATCH v2 13/26] drm/exynos: hdmi: remove the i2c drivers and use devtree Sean Paul
2013-10-16 19:26 ` [PATCH v2 14/26] drm/exynos: Remove exynos_drm_hdmi shim Sean Paul
2013-10-16 19:26 ` [PATCH v2 15/26] drm/exynos: Use drm_mode_copy to copy modes Sean Paul
2013-10-16 19:26 ` [PATCH v2 16/26] drm/exynos: Disable unused crtc planes from crtc Sean Paul
2013-10-16 19:26 ` [PATCH v2 17/26] drm/exynos: Add mode_set manager operation Sean Paul
2013-10-16 19:26 ` [PATCH v2 18/26] drm/exynos: Implement mode_fixup " Sean Paul
2013-10-16 19:26 ` [PATCH v2 19/26] drm/exynos: Use mode_set to configure fimd Sean Paul
2013-10-16 19:26 ` [PATCH v2 20/26] drm/exynos: Remove unused/useless fimd_context members Sean Paul
2013-10-16 19:26 ` [PATCH v2 21/26] drm/exynos: Move dp driver from video/ to drm/ Sean Paul
2013-10-16 19:26 ` [PATCH v2 22/26] drm/exynos: Move display implementation into dp Sean Paul
2013-10-16 19:26 ` [PATCH v2 23/26] ARM: dts: Move display-timings node from fimd to dp Sean Paul
2013-10-16 19:26 ` [PATCH v2 24/26] drm/exynos: Implement dpms display callback in DP Sean Paul
2013-10-16 19:26 ` [PATCH v2 25/26] drm/exynos: Clean up FIMD power on/off routines Sean Paul
2013-10-16 19:26 ` [PATCH v2 26/26] drm/exynos: Consolidate suspend/resume in drm_drv Sean Paul
2013-10-16 20:40   ` Sean Paul
2013-10-17  5:10     ` Inki Dae

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