linux-kernel - Re: [PATCH v2 06/12] media: hantro: add support for Rockchip RK3066

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Date:   Mon, 14 Jun 2021 18:46:49 +0200
From:   Alex Bee <knaerzche@...il.com>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Lee Jones <lee.jones@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 06/12] media: hantro: add support for Rockchip RK3066

Hi Ezequiel,

Am 11.06.21 um 17:50 schrieb Ezequiel Garcia:
> Hi Alex,
>
> On Thu, 2021-05-27 at 17:44 +0200, Alex Bee wrote:
>> RK3066's VPU IP block is the predecessor from what RK3288 has.
>> The hardware differences are:
>>    - supports decoding frame sizes up to 1920x1088 only
>>    - doesn't have the 'G1_REG_SOFT_RESET' register
>>      (requires another .reset callback for hantro_codec_ops,
>>       since writing this register will result in non-working
>>       IP block)
>>    - has one ACLK/HCLK per vdpu/vepu
>>    - ACLKs can be clocked up to 300 MHz only
> Have you tested trying 400 MHz (or more) ?

Yes, I've tried this on both RK3066 and RK3036 variants - everything 
above  300 MHz results in non-functioning IP block.

See comment in RK3036 devicetree in vendor kernel at [1].

[1] 
https://github.com/rockchip-linux/kernel/blob/develop-4.4/arch/arm/boot/dts/rk3036.dtsi#L246-L248

>
>>    - no MMU
>>      (no changes required: CMA will be transparently used)
>>
>> Add a new RK3066 variant which reflect this differences. This variant
>> can be used for RK3188 as well.
>>
> Reviewed-by: Ezequiel Garcia <ezequiel@...labora.com>
>
> Thanks!
> Ezequiel
>