sun6i MIPI DSI driver EoTp

sun6i MIPI DSI driver EoTp

[Sergey Suloev]

Hi, Maxime,

according to MIPI DSI spec chapter 8.8.2  the EoTp packet can be enabled 
or disabled on the protocol level.
It seems like that it might be required for the panel I am working on 
(Himax HX8379A-based panel).
Here is some crappy driver I found on github showing that it might be an 
issue  [1]

May I ask you if this feature supported by sun6i MIPI DSI driver and 
where ?
As there is no datasheet available, could you please help to support 
this feature (if not yet) ?

The second point is that the panel requires NON-BURST-WITH-SYNC-EVENTS 
mode.
Could it be a problem with the current driver?

[1] 
https://github.com/lnfamous/Kernel_Htc_Pico_CyanogenMod12.1/blob/ff5eed4b86f5c9e653ebde4d89fe969c6abf611a/drivers/video/msm/mipi_hx8379a_video_wvga_pt.c#L107

[2] 
https://github.com/lnfamous/Kernel_Htc_Pico_CyanogenMod12.1/blob/ff5eed4b86f5c9e653ebde4d89fe969c6abf611a/drivers/video/msm/mipi_hx8379a_video_wvga_pt.c#L92

Thank you,
Sergey

Re: sun6i MIPI DSI driver EoTp

[Maxime Ripard]

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Hi,

On Mon, Mar 11, 2019 at 09:43:36PM +0300, Sergey Suloev wrote:
> according to MIPI DSI spec chapter 8.8.2  the EoTp packet can be enabled or
> disabled on the protocol level.
> It seems like that it might be required for the panel I am working on (Himax
> HX8379A-based panel).
> Here is some crappy driver I found on github showing that it might be an
> issue  [1]
> 
> May I ask you if this feature supported by sun6i MIPI DSI driver and
> where ?
> As there is no datasheet available, could you please help to support this
> feature (if not yet) ?

I haven't seen any panel that used it so far, so I have no idea.

I guess this would be controlled through
SUN6I_DSI_BASIC_CTL0_HS_EOTP_EN in the driver.

> The second point is that the panel requires NON-BURST-WITH-SYNC-EVENTS mode.
> Could it be a problem with the current driver?

That should be supported in -next

Maxime

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

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