linux-kernel - Re: [PATCH] clk: tegra: Fix clock sources for tegra210 EMC

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Message-ID: <567438FA.2030405@nvidia.com>
Date:	Fri, 18 Dec 2015 11:48:58 -0500
From:	Rhyland Klein <rklein@...dia.com>
To:	Jon Hunter <jonathanh@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>
CC:	<linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: tegra: Fix clock sources for tegra210 EMC

On 12/18/2015 8:45 AM, Jon Hunter wrote:
> The EMC clock sources for tegra210 currently incorrectly include pll_c2
> and pll_c3. However, both of these should have been pll_mb as shown in
> the TRM. If tegra210 happens to be configured such that the pll_mb is the
> default clock for the EMC, as configured by the bootloader, then this will
> cause a system hang on boot. This is because the kernel will disable the
> pll_mb when disabling unused clock as it appears to be unused when it is
> not.
> 
> Also add the additional pll_p clock source for the EMC.
> 
> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
> ---
>  drivers/clk/tegra/clk-tegra210.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
> index 58514c44ea83..849be30b52bf 100644
> --- a/drivers/clk/tegra/clk-tegra210.c
> +++ b/drivers/clk/tegra/clk-tegra210.c
> @@ -243,7 +243,8 @@ static unsigned long tegra210_input_freq[] = {
>  };
>  
>  static const char *mux_pllmcp_clkm[] = {
> -	"pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud", "pll_c2", "pll_c3",
> +	"pll_m", "pll_c", "pll_p", "clk_m", "pll_m_ud", "pll_mb", "pll_mb",
> +	"pll_p",
>  };
>  #define mux_pllmcp_clkm_idx NULL
>  
> 

Acked-by: Rhyland Klein <rklein@...dia.com>

-rhyland

-- 
nvpublic
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