linux-kernel - Re: [PATCH v10 11/11] drm: bridge/dw

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Date:	Fri, 14 Nov 2014 11:16:14 +0000
From:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
To:	Andy Yan <andy.yan@...k-chips.com>, <airlied@...ux.ie>,
	<heiko@...ech.de>, <fabio.estevam@...escale.com>,
	<rmk+kernel@....linux.org.uk>
CC:	Mark Rutland <mark.rutland@....com>,
	<dri-devel@...ts.freedesktop.org>, <ykk@...k-chips.com>,
	<devel@...verdev.osuosl.org>, Arnd Bergmann <arnd@...db.de>,
	<linux-rockchip@...ts.infradead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Dave Airlie <airlied@...hat.com>, <jay.xu@...k-chips.com>,
	<devicetree@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Inki Dae <inki.dae@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Sean Paul <seanpaul@...omium.org>, <mark.yao@...k-chips.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <djkurtz@...gle.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH v10 11/11] drm: bridge/dw_hdmi: add rockchip rk3288 support



On 14/11/14 11:13, Andy Yan wrote:
> 
> On 2014年11月14日 18:53, Zubair Lutfullah Kakakhel wrote:
>>
>> On 14/11/14 10:37, Andy Yan wrote:
>>> On 2014年11月14日 18:23, Zubair Lutfullah Kakakhel wrote:
>>>> Hi Andy
>>>>
>>>> On 14/11/14 03:31, Andy Yan wrote:
>>>>> Rockchip RK3288 hdmi is compatible with dw_hdmi
>>>>>
>>>>> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
>>>>>
>>>>> ---
>>>>>
>>>>> Changes in v10:
>>>>> - add more display mode support mpll configuration for rk3288
>>>>>
>>>>> Changes in v9:
>>>>> - move some phy configuration to platform driver
>>>>>
>>>>> Changes in v8: None
>>>>> Changes in v7: None
>>>>> Changes in v6: None
>>>>> Changes in v5: None
>>>>> Changes in v4: None
>>>>> Changes in v3: None
>>>>> Changes in v2: None
>>>>>
>>>>>    drivers/gpu/drm/bridge/dw_hdmi.c            |  10 +
>>>>>    drivers/gpu/drm/bridge/dw_hdmi.h            |   3 +-
>>>>>    drivers/gpu/drm/rockchip/Kconfig            |  10 +
>>>>>    drivers/gpu/drm/rockchip/Makefile           |   2 +-
>>>>>    drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 355 ++++++++++++++++++++++++++++
>>>>>    include/drm/bridge/dw_hdmi.h                |   1 +
>>>>>    6 files changed, 379 insertions(+), 2 deletions(-)
>>>>>    create mode 100644 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
>>>>>
>>>>> diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
>>>>> index a2876fe..1dd1f0b 100644
>>>>> --- a/drivers/gpu/drm/bridge/dw_hdmi.c
>>>>> +++ b/drivers/gpu/drm/bridge/dw_hdmi.c
>>>>> @@ -715,6 +715,13 @@ static void dw_hdmi_phy_enable_tmds(struct dw_hdmi *hdmi, u8 enable)
>>>>>                 HDMI_PHY_CONF0_ENTMDS_MASK);
>>>>>    }
>>>>>    +static void dw_hdmi_phy_enable_spare(struct dw_hdmi *hdmi, u8 enable)
>>>>> +{
>>>>> +    hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
>>>>> +             HDMI_PHY_CONF0_SPARECTRL_OFFSET,
>>>>> +             HDMI_PHY_CONF0_SPARECTRL_MASK);
>>>>> +}
>>>>> +
>>>> What does enable spare do? Can other future SoCs use it?
>>>>
>>>> This looks like DW specific. And can be a separate commit that adds a feature to the dw hdmi driver.
>>>    Actually I am not very clearly about this bit, but RK3288 HDMI will not work without this bit enable.
>>>    On imx6, the description about this bit is:Reserved. Spare pin control.
>>>    On rk3288, the description is: svsret/sparectrl
>>>     Both are very simple.
>> Sounds like the IP Core in the rk3288 is slightly upgraded.
>> Separate this section in a different commit as it is generic DW stuff.
>>
>> And add what you wrote above in the commit message.
>   Only Separate function dw_hdmi_phy_enale_spare ? not include
>   if (hdmi->dev_type == rk3288_hdmi)
>                dw_hdmi_enable_phy_spare(hdmi, 1);
>  ?

Yes. Separate dw_hdmi_phy_enable_spare and its associated defines 
 HDMI_PHY_CONF0_SPARECTRL_OFFSET
 HDMI_PHY_CONF0_SPARECTRL_MASK
 in the header
as one commit.


The if (hdmi->dev_type == rk3288_hdmi) code is part of the add rk3288 support.

ZubairLK
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