linux-kernel - Re: [PATCH v5 07/17] drm/sun4i: sun6i_mipi_dsi: Refactor vertical video start delay

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Message-ID: <20190122111408.4zlhecsxywulvrfy@flea>
Date:   Tue, 22 Jan 2019 12:14:08 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v5 07/17] drm/sun4i: sun6i_mipi_dsi: Refactor vertical
 video start delay

On Thu, Jan 17, 2019 at 10:02:12AM +0530, Jagan Teki wrote:
> On Thu, Jan 17, 2019 at 12:48 AM Maxime Ripard
> <maxime.ripard@...tlin.com> wrote:
> >
> > On Sun, Jan 13, 2019 at 01:07:41AM +0530, Jagan Teki wrote:
> > > > > > > > Again, I cannot help you without the datasheet for the panels you're
> > > > > > > > trying to submit.
> > > > > > >
> > > > > > > The panel bound with Sitronix ST7701 IC
> > > > > > > http://www.startek-lcd.com/res/starteklcd/pdres/201705/20170512144242904.pdf
> > > > > >
> > > > > > It's the controller, not the panel
> > > > >
> > > > > As I said before, the datasheet of that panel doesn't have any
> > > > > information except electrical characteristics and used IC which is
> > > > > ST7701.
> > > > >
> > > > > I have one more panel, which is from Bananapi, S070WV20-CT16 ICN621
> > > > > please find the attachment for the same.
> > > > >
> > > > > Here is some more details of the same.
> > > > >
> > > > > https://github.com/yesnoandor/x300/blob/master/kernel/arch/arm/boot/dts/erobbing/x300/x300.dtsi#L81
> > > > > https://github.com/wxzed/Raspberry_5MIPI_Display/blob/master/I2C_Slave/USER/main.c#L15
> > > > >
> > > > > https://github.com/eliot-shao/qcom/blob/master/icn6211_cxn0102/kernel/drivers/video/msm/mdss/mdss_i2c_interface.c#L152
> > > > > matches timings for
> > > > > https://github.com/eliot-shao/qcom/blob/master/icn6211_cxn0102/kernel/arch/arm/boot/dts/qcom/dsi-mipi-2-rgb_1280p_video.dtsi#L20
> > > > >
> > > > > https://github.com/zestroly/micromat/blob/master/test/raspberry/ICN6211.cpp#L169
> > > >
> > > > Where did you get the timings from then?
> > >
> > > You mean drm_mode timings, the same panel with RGB available in
> > > panel-simple[1], and dsi driver in Mailing list[2] and actual DSI
> > > sequence commands from BSP[3]
> > >
> > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/panel/panel-simple.c?id=7ad8b41cd8f5c2842646d01cdd576663caee04a7
> > > [2] https://patchwork.kernel.org/patch/10680331/
> > > [3] https://github.com/BPI-SINOVOIP/BPI-M64-bsp/blob/master/linux-sunxi/drivers/video/sunxi/disp2/disp/lcd/S070WV20_MIPI_RGB.c
> >
> > So you had no reliable source for the timings then? How do you know if
> > all your patches that are timing related are right then?
> 
> I don't understand your point, or may be I confused with many links
> that I attached in previous mail.
> 
> 1. Patch for same panel timings are already in Mainline that was
> tested on one of the board. [1]
> 2. Driver from AW, released bsp from BPI-M64-bsp [3]
> 
> Do you think the above two points are not valid sources?

I'm saying that the only valid source is the datasheet or a DSI analyzer.

Maxmie

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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