linux-kernel - Re: [PATCH v5] clk: tegra: Initialize UTMIPLL when enabling PLLU

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Date:	Tue, 14 Jun 2016 13:33:01 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Rhyland Klein <rklein@...dia.com>
Cc:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Jon Hunter <jonathanh@...dia.com>, linux-clk@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: Re: [PATCH v5] clk: tegra: Initialize UTMIPLL when enabling PLLU

On Thu, May 26, 2016 at 12:41:31PM -0400, Rhyland Klein wrote:
> From: Andrew Bresticker <abrestic@...omium.org>
> 
> Move the UTMIPLL initialization code form clk-tegra<chip>.c files into
> clk-pll.c. UTMIPLL was being configured and set in HW control right
> after registration. However, when the clock init_table is processed and
> child clks of PLLU are enabled, it will call in and enable PLLU as
> well, and initiate SW enabling sequence even though PLLU is already in
> HW control. This leads to getting UTMIPLL stuck with a SEQ_BUSY status.
> 
> Doing the initialization once during pllu_enable means we configure it
> properly into HW control.
> 
> A side effect of the commonization/localization of the UTMIPLL init
> code, is that it corrects some errors that were present for earlier
> generations. For instance, in clk-tegra124.c, it used to have:
> 
> define UTMIP_PLL_CFG1_ENABLE_DLY_COUNT(x) (((x) & 0x1f) << 6)
> 
> when the correct shift to use is present in the new version:
> 
> define UTMIP_PLL_CFG1_ENABLE_DLY_COUNT(x) (((x) & 0x1f) << 27)
> 
> which matches the Tegra124 TRM register definition.
> 
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> 
> [rklein: Merged in some later fixes for potential deadlocks]
> 
> Signed-off-by: Rhyland Klein <rklein@...dia.com>
> ---
> v5:
>  - Initialized flags to 0 to avoid harmless spinlock warnings
> 
> v4:
>  - Re-added examples in patch description
> 
> v3:
>  - Flushed out description to describe this patch.
> 
>  drivers/clk/tegra/clk-pll.c      | 484 +++++++++++++++++++++++++++++++++++++++
>  drivers/clk/tegra/clk-tegra114.c | 155 +------------
>  drivers/clk/tegra/clk-tegra124.c | 156 +------------
>  drivers/clk/tegra/clk-tegra210.c | 182 +--------------
>  drivers/clk/tegra/clk-tegra30.c  | 113 +--------
>  drivers/clk/tegra/clk.h          |  17 ++
>  6 files changed, 510 insertions(+), 597 deletions(-)

Applied, thanks.

Thierry

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