linux-kernel - Re: [PATCH v5 06/10] clk: tegra: Workaround for Tegra114 MSENC problem

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Date:	Mon, 4 Feb 2013 12:09:45 +0530
From:	Prashant Gaikwad <pgaikwad@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Simon Glass <sjg@...omium.org>,
	Mike Turquette <mturquette@...aro.org>,
	Joseph Lo <josephl@...dia.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 06/10] clk: tegra: Workaround for Tegra114 MSENC problem

On Friday 01 February 2013 03:48 PM, Peter De Schrijver wrote:
> Workaround a hardware bug in MSENC during clock enable.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>   drivers/clk/tegra/clk-periph-gate.c |    9 +++++++++
>   drivers/clk/tegra/clk.h             |    1 +
>   2 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-periph-gate.c b/drivers/clk/tegra/clk-periph-gate.c
> index 6dd5332..c9083fb 100644
> --- a/drivers/clk/tegra/clk-periph-gate.c
> +++ b/drivers/clk/tegra/clk-periph-gate.c
> @@ -43,6 +43,8 @@ static DEFINE_SPINLOCK(periph_ref_lock);
>   
>   #define periph_clk_to_bit(periph) (1 << (gate->clk_num % 32))
>   
> +#define LVL2_CLK_GATE_OVRE 0x554
> +
>   /* Peripheral gate clock ops */
>   static int clk_periph_is_enabled(struct clk_hw *hw)
>   {
> @@ -83,6 +85,13 @@ static int clk_periph_enable(struct clk_hw *hw)
>   		}
>   	}
>   
> +	if (gate->flags & TEGRA_PERIPH_WAR_1005168) {
> +		writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE);
> +		writel_relaxed(BIT(22), gate->clk_base + LVL2_CLK_GATE_OVRE);
> +		udelay(1);
> +		writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE);
> +	}
> +
>   	spin_unlock_irqrestore(&periph_ref_lock, flags);
>   
>   	return 0;
> diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
> index 79f5e2a..8756d9f 100644
> --- a/drivers/clk/tegra/clk.h
> +++ b/drivers/clk/tegra/clk.h
> @@ -371,6 +371,7 @@ struct tegra_clk_periph_gate {
>   #define TEGRA_PERIPH_NO_RESET BIT(0)
>   #define TEGRA_PERIPH_MANUAL_RESET BIT(1)
>   #define TEGRA_PERIPH_ON_APB BIT(2)
> +#define TEGRA_PERIPH_WAR_1005168 BIT(3)
>   

Comment for this flag, otherwise

Reviewed-by: Prashant Gaikwad <pgaikwad@...dia.com>

>   void tegra_periph_reset(struct tegra_clk_periph_gate *gate, bool assert);
>   extern const struct clk_ops tegra_clk_periph_gate_ops;
>

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