linux-kernel - Re: [PATCH v2] clk: analogbits: Fix incorrect calculation of vco rate delta

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Message-ID: <b26a4774530bd59b4e48a36bc6953d55.sboyd@kernel.org>
Date: Thu, 16 Jan 2025 13:46:25 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Bo Gan <ganboing@...il.com>, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: samuel.holland@...ive.com, emil.renner.berthing@...onical.com, mturquette@...libre.com, paul.walmsley@...ive.com
Subject: Re: [PATCH v2] clk: analogbits: Fix incorrect calculation of vco rate delta

Quoting Bo Gan (2024-08-29 23:16:39)
> In function `wrpll_configure_for_rate`, we try to determine the best PLL
> configuration for a target rate. However, in the loop where we try values
> of R, we should compare the derived `vco` with `target_vco_rate`. However,
> we were in fact comparing it with `target_rate`, which is actually after
> Q shift. This is incorrect, and sometimes can result in suboptimal clock
> rates. This patch fixes it.
> 
> Fixes: 7b9487a9a5c4 ("clk: analogbits: add Wide-Range PLL library")
> Signed-off-by: Bo Gan <ganboing@...il.com>
> ---

Applied to clk-next