[U-Boot] [linux-sunxi] Re: [RFC PATCH 0/3] sunxi: video: Add support for HDMI output on H3
Chen-Yu Tsai
wens at csie.org
Wed Dec 14 04:02:33 CET 2016
On Wed, Dec 14, 2016 at 5:16 AM, Icenowy Zheng <icenowy at aosc.xyz> wrote:
>
>
> 14.12.2016, 04:29, "Simon Glass" <sjg at chromium.org>:
>> Hi,
>>
>> On 12 December 2016 at 19:36, Jernej Skrabec <jernej.skrabec at siol.net> wrote:
>>> This patch series add support for HDMI output. Support for other,
>>> newer, SoCs, which also uses DE2 and same or similar HDMI controller
>>> and PHY can be easily added later (A83T/A64/H5/R40). Current driver
>>> can also be easily extended with TV out support, just like video
>>> driver for older Allwinner SoCs.
>>>
>>> While driver works, I would like to get few opinions first.
>>> - From what I understand, drivers which supports DT are preferred.
>>> Would it be better to rewrite this driver to support device tree?
>>
>> Yes I think so, and in fact it should use driver model also.
>>
>> The rockchip driver provides a reasonable example of how to split the
>> driver up as you suggest below. The VIDEO driver provides the
>> top-level video interface, DISPLAY drivers provide display output for
>> the video, and you have PANEL as well for receiving the display
>> output. VIDCONSOLE works automatically to display text.
>>
>> I actually took a bit of a look at this a few weeks ago so am happy to
>> help with review or discussions.
>
> Yes, I think go to Driver Model is also valuable, as Allwinner's display parts
> are really in reusable components.
>
> In addition, Driver Model provides the possibility to use EFI GOP, which can
> be a more standardized replacement of SimpleFB, especially for OSes other
> than Linux. (For example, Windows, if we can really get it running ;-) )
We're going to use EFI now? Doesn't EFI mean we have to leave another bit
of firmware in memory running under the OS? What about PSCI and ATF on
ARMv8?
ChenYu
>
>>
>>> - TCON code is currently exactly the same as in driver for older
>>> SoCs. Should I split it out into shared module? Also TV out code
>>> seems to be similar, but I didn't manage to confirm that it works
>>> as-is on H3.
>>> - A80 SoC is mix of older display engine and newer HDMI controller,
>>> so it doesn't really work with either of sunxi video drivers. Two
>>> solutions I see here are either combine both driver into one massive
>>> display driver or, much better, split everything by components
>>> (TCON/DE/DE2/HDMI/TV) and instantiate compatible ones. I guess this
>>> is not much different than adding support for DT in drivers. Note
>>> that I don't have any A80 board, I'm just thinking ahead.
>>>
>>> Best regards,
>>> Jernej Skrabec
>>>
>>> Jernej Skrabec (3):
>>> sunxi: Add clocks for DE2/HDMI/TCON
>>> sunxi: video: Add video driver for H3 SoC
>>> sunxi: Enable H3 video driver in defconfigs
>>>
>>> arch/arm/include/asm/arch-sunxi/clock_sun6i.h | 43 +
>>> arch/arm/include/asm/arch-sunxi/cpu_sun4i.h | 8 +
>>> arch/arm/include/asm/arch-sunxi/display2.h | 377 +++++++++
>>> arch/arm/mach-sunxi/clock_sun6i.c | 28 +
>>> board/sunxi/Kconfig | 4 +-
>>> configs/orangepi_2_defconfig | 1 +
>>> configs/orangepi_lite_defconfig | 1 +
>>> configs/orangepi_one_defconfig | 1 +
>>> configs/orangepi_pc_defconfig | 1 +
>>> configs/orangepi_pc_plus_defconfig | 1 +
>>> configs/orangepi_plus2e_defconfig | 1 +
>>> configs/orangepi_plus_defconfig | 1 +
>>> drivers/video/Makefile | 1 +
>>> drivers/video/sunxi_display2.c | 1037 +++++++++++++++++++++++++
>>> include/configs/sunxi-common.h | 17 +-
>>> scripts/config_whitelist.txt | 1 +
>>> 16 files changed, 1516 insertions(+), 7 deletions(-)
>>> create mode 100644 arch/arm/include/asm/arch-sunxi/display2.h
>>> create mode 100644 drivers/video/sunxi_display2.c
>>>
>>> --
>>> 2.10.2
>>
>> Regards,
>> Simon
>>
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