[PATCH V7 00/12] drm/exynos: few patches to enhance bridge chip support

[Ajay kumar]

On Tue, Sep 16, 2014 at 6:14 PM, Javier Martinez Canillas
<javier at dowhile0.org> wrote:
> [adding Laurent Pinchart to cc who had concerns with a previous
> version of this patch-set]
>
> Hello Ajay,
>
> On Wed, Aug 27, 2014 at 4:29 PM, Ajay Kumar <ajaykumar.rs at samsung.com> wrote:
>> This series is based on master branch of Linus tree at:
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>
>> I have tested this after adding few DT changes for exynos5250-snow and
>> exynos5420-peach-pit boards.
>>
>> The V4 series of this particular patchset was also tested by:
>> Rahul Sharma <rahul.sharma at samsung.com>
>> Javier Martinez Canillas <javier at dowhile0.org>
>>
>> Changes since V2:
>>         -- Address comments from Jingoo Han for ps8622 driver
>>         -- Address comments from Daniel, Rob and Thierry regarding
>>            bridge chaining
>>         -- Address comments from Thierry regarding the names for
>>            new drm_panel functions
>>
>> Changes since V3:
>>         -- Remove hotplug based initialization of exynos_dp
>>         -- Make exynos_dp work directly with drm_panel, remove
>>            dependency on panel_binder
>>         -- Minor cleanups in panel_binder and panel_lvds driver
>>
>> Changes since V4:
>>         -- Use gpiod interface for panel-lvds and ps8622 drivers.
>>         -- Address comments from Javier.
>>         -- Fix compilation issues when PANEL_BINDER is selected as module.
>>         -- Split Documentation patches from driver patches.
>>         -- Rebase on top of the tree.
>>
>> Changes since V5:
>>         -- Modify bridge drivers to support driver model.
>>         -- Drop the concept of bridge chain(sincle there are no 2 real bridges)
>>            Hence drop bridge-panel_binder layer.
>>         -- Drop panel-lvds driver and accomodate the required changes in
>>            panel-simple driver.
>>         -- Use gpiod interface in ptn3460 driver.
>>         -- Address all comments by Thierry Reding for V5 series.
>>         -- Address comments from Sean Paul for exynos_dp_commit issue.
>>
>> Changes since V6:
>>         -- Panel patches were seperated and they are merged already.
>>         -- Fix few issues with ptn3460, before modifying the bridge core.
>>         -- Modify drm_bridge as per Thierry's comments for V6 series.
>>         -- Add drm_bridge changes minimally without breaking existing code.
>>         -- Add new features for ptn3460, step-by-step.
>>         -- Address comments from Thierry and Andreas for ptn3460 and ps8622.
>>         -- Split documentation patches from driver patches.
>>
>
> I've tested your series on an Exynos5420 Peach Pit and an Exynos5250
> Snow Chromebooks and display worked for me on both machines.
Great!

> I also needed "[PATCH] drm/panel: simple: Add AUO B116XW03 panel
> support" [0] which does not apply cleanly on linux-next so you may
> want to do a re-spin for that patch.
Ok. I will take care of this in next version.

> For Snow I also had to disable CONFIG_FB_SIMPLE, otherwise I just saw
> a blink on boot and only the backlight remained turned on (no display
> output). I don't know if that is expected since IIUC it should be
> possible to do a transition from simplefb to a DRM/KMS driver. I don't
> have a serial console hooked on this machine so I couldn't debug it
> further, sorry.
I am just wondering how SIMPLE FB can affect DRM based display.
I am not even sure if both can co-exist or not. Is there anything
we can do with bootargs instead of CONFIG?

Ajay

> Also, I saw that Laurent mentioned some concerns today about the
> previous version (v6) of your series [1]. I guess he missed this v7
> although AFAIU there was no fundamental change on this one so his
> concerns remains? I was really hoping that this could make it to 3.18
> since display support is one of the last major functionalities that is
> missing on these machines.
>
> Best regards,
> Javier
>
> [0]: http://patchwork.ozlabs.org/patch/384744/
> [1]: http://www.spinics.net/lists/linux-samsung-soc/msg36791.html