linux-kernel - Re: [PATCH v3 3/6] drm/rockchip/dsi: correct Feedback divider setting

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Date:   Mon, 27 Nov 2017 16:34:12 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Philippe CORNU <philippe.cornu@...com>
Cc:     Archit Taneja <architt@...eaurora.org>,
        Sean Paul <seanpaul@...omium.org>,
        Nickey Yang <nickey.yang@...k-chips.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "hl@...k-chips.com" <hl@...k-chips.com>,
        "xbl@...k-chips.com" <xbl@...k-chips.com>,
        Kristian Kristensen <hoegsberg@...il.com>,
        Chris Zhong <zyw@...k-chips.com>
Subject: Re: [PATCH v3 3/6] drm/rockchip/dsi: correct Feedback divider setting

(Dropping Mark, whose Rockchip address is dead; and fixing Chris's email again)

On Mon, Nov 27, 2017 at 4:29 PM, Brian Norris <briannorris@...omium.org> wrote:
> On Thu, Oct 26, 2017 at 09:44:14AM +0000, Philippe CORNU wrote:
>> On 10/26/2017 06:13 AM, Archit Taneja wrote:
>> > On 10/26/2017 06:39 AM, Brian Norris wrote:
>> >> somebody already working on refactoring existing Rockchip code to use
>> >> this?
>> >
>> > I don't know. If rockchip isn't interested in doing it, we can check with
>> > Philippe from ST if he can try creating a RFC that converts the rockchip
>> > driver to use the dw-mipi-dsi driver.
>>
>> I am not really interested in doing this port for Rockchip (or Hisilicon
>> or i.MX...) but happy to help anyone that wants to use the dw-mipi-dsi
>> bridge driver :)
>
> Ugh, this stuff is worse than I expected. I'm helping Rockchip along
> with getting this rewritten, but there are some hiccups.
>
> Among other things, the bridge driver is assuming it can set the
> device's drvdata itself. This works because the STM MIPI driver is
> simple, but the Rockchip one registers stuff via component_add(), and so
> it *needs* to handle drvdata between probe() and bind()...but then the
> "common" bridge driver is going to clobber it (dev_set_drvdata()).
>
> Along the way, I'm noticing that the STM driver just steps around this
> at times by referencing a static (!!) instance of its priv_data. See:
>
> static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
> {
>         struct dw_mipi_dsi_stm *dsi = dw_mipi_dsi_stm_plat_data.priv_data;
> ...
>
>
> I might rewrite this, but it's not fun to have to fix somebody else's
> fork for them...
>
> Brian