linux-kernel - Re: [PATCH 0/4] Genericize DW MIPI DSI bridge and add i.MX 6 driver

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Date:   Thu, 31 Oct 2019 21:10:48 +0200
From:   Adrian Ratiu <adrian.ratiu@...labora.com>
To:     Emil Velikov <emil.l.velikov@...il.com>,
        Adrian Ratiu <adrian.ratiu@...labora.com>
Cc:     "Linux-Kernel\@Vger. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-rockchip <linux-rockchip@...ts.infradead.org>,
        kernel@...labora.com, linux-stm32@...md-mailman.stormreply.com,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/4] Genericize DW MIPI DSI bridge and add i.MX 6 driver

On Thu, 31 Oct 2019, Emil Velikov <emil.l.velikov@...il.com> 
wrote:
> Hi Adrian, 

Hi Emil!

> 
> On Thu, 31 Oct 2019 at 14:26, Adrian Ratiu 
> <adrian.ratiu@...labora.com> wrote: 
>> 
>> Having a generic Synopsis DesignWare MIPI-DSI host controller 
>> bridge driver is a very good idea, however the current 
>> implementation has hardcoded quite a lot of the register 
>> layouts used by the two supported SoC vendors, STM and 
>> Rockchip, which use IP cores v1.30 and v1.31. 
>> 
>> This makes it hard to support other SoC vendors like the 
>> FSL/NXP i.MX 6 which use older v1.01 cores or future versions 
>> because, based on history, layout changes should also be 
>> expected in new DSI versions / SoCs. 
>> 
>> This patch series converts the bridge and platform drivers to 
>> access registers via generic regmap APIs and allows each 
>> platform driver to configure its register layout via struct 
>> reg_fields, then adds support for the host controller found on 
>> i.MX 6. 
>> 
> Have you considered keeping the difference internal to the 
> dw-mipi-dsi driver?  Say having the iMX6 module "request" the 
> v1.01 regmap from the bridge driver, while rockchip/others doing 
> the equivalent.

No, I haven't. It sounds like a good idea though and I think it's 
doable. Thank you!

> 
>>  .../bindings/display/imx/mipi-dsi.txt         |  56 ++ 
>>  drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 518 
>>  +++++++++--------- drivers/gpu/drm/imx/Kconfig 
>>  |   7 + drivers/gpu/drm/imx/Makefile                  |   1 + 
>>  drivers/gpu/drm/imx/dw_mipi_dsi-imx.c         | 502 
>>  +++++++++++++++++ .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c 
>>  | 154 +++++- drivers/gpu/drm/stm/dw_mipi_dsi-stm.c         | 
>>  160 +++++- include/drm/bridge/dw_mipi_dsi.h              |  60 
>>  +- 8 files changed, 1185 insertions(+), 273 deletions(-) 
>>  create mode 100644 
>>  Documentation/devicetree/bindings/display/imx/mipi-dsi.txt 
>>  create mode 100644 drivers/gpu/drm/imx/dw_mipi_dsi-imx.c 
>> 
> 
> This should make the delta a lot smaller, avoiding the 
> unnecessary copy of register fields and regmap.  Plus plugging 
> future users will be dead trivial.

Agreed. I'll do this in v2 unless someone objects or proposes a 
better alternative.

I'll let this series sit a little more on review so others have a 
chance to see and review; will address all feedback in v2.

>
> -Emil
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

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