linux-kernel - Re: [linux-sunxi] [PATCH v2 04/29] clk: sunxi-ng: h6: Set video PLLs limits

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Message-ID: <a303145c-b123-d912-91d7-9830dec3244e@openedev.com>
Date:   Fri, 12 Oct 2018 13:43:32 +0530
From:   Jagan Teki <jagan@...nedev.com>
To:     jernej.skrabec@...l.net, maxime.ripard@...tlin.com, wens@...e.org
Cc:     robh+dt@...nel.org, sboyd@...nel.org, airlied@...ux.ie,
        architt@...eaurora.org, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] [PATCH v2 04/29] clk: sunxi-ng: h6: Set video PLLs
 limits

On Sunday 07 October 2018 03:08 PM, Jernej Skrabec wrote:
> Video PLL factors can be set in a way that final PLL rate is outside
> stable range. H6 user manual specifically says that N factor should not
> be below 12. While it doesn't says anything about maximum stable rate, it

Manual says "In application, PLL_FACTOR_N should be more than or equal 
to 11" can't it be 11?

> is clear that PLL doesn't work at 6.096 GHz (254 * 24 MHz).
> 
> Set minimum allowed PLL video rate to 288 MHz (12 * 24 MHz) and maximum
> to 2.4 GHz, which is maximum in BSP driver.

Is this max freq from here [1]

[1] 
https://github.com/Allwinner-Homlet/H6-BSP4.9-linux/blob/master/drivers/clk/sunxi/clk-sun50iw6.c#L164