linux-kernel - Re: [RFC PATCH v2 3/4] drm: rockchip: hdmi: add RK3229 HDMI support

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Date:	Fri, 8 Jan 2016 17:13:52 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Mark Yao <mark.yao@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Andy Yan <andy.yan@...k-chips.com>,
	David Airlie <airlied@...ux.ie>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Zheng Yang <zhengyang@...k-chips.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v2 3/4] drm: rockchip: hdmi: add RK3229 HDMI support

Hi Philipp,

On 01/08/2016 12:50 AM, Philipp Zabel wrote:
> Hi Yakir,
>
> Am Donnerstag, den 07.01.2016, 18:15 +0800 schrieb Yakir Yang:
>> Hi Philipp,
>>
>> Thanks for your fast respond :)
>>
>> On 01/07/2016 06:04 PM, Philipp Zabel wrote:
>>> Am Donnerstag, den 07.01.2016, 17:02 +0800 schrieb Yakir Yang:
>>>> RK3229 integrate an DesignedWare HDMI2.0 controller and an INNO HDMI2.0 phy,
>>>> the max output resolution is 4K.
>>>>
>>>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>>> It sounds like the INNO HDMI2.0 phy is not necessarily specific to
>>> RK3229 but might also appear in other SoCs? If so, I think this should
>>> be implemented in a separate phy driver and be used by dw_hdmi-rockchip.
>> Do you mean I should create a new phy driver that place in "driver/phy"
>> directly ?
> Possibly, yes. The exynos video phys are already there. I have kept the
> mediatek dsi/hdmi phys together with the DRM driver, but I suppose I
> could move them there, too.
>
>> I have think about this idea, and it would make things much clean. But
>> INNO PHY
>> driver need the target pixel clock in drm_display_mode, I didn't find a
>> good way
>> to pass this variable to separate phy driver. Do you have some idea ?
> We'd need to extend the PHY API for this. For the mediatek phys we have
> side-stepped the issue by wiring up the PLL output to the common clock
> framework.

Wow, I have look at your "drm/mediatek: Add HDMI support" patch, it's 
great to
registers a common clock framework.

> I expect besides the pixel clock frequency, it might also be necessary
> to inform the PHY about cycles per pixel for deep color modes.

INNO PHY didn't need the color depth directly, driver could get the 
input pixel
clock rate, and then hdmi core driver could set TMDS rate though common
clock framework.

Anyway it's great material, I would update the new version out.

Thanks a lot
- Yakir

> regards
> Philipp
>
>
>
>