linux-kernel - Re: [PATCH 3/3] ahci: st: st_configure_oob must be called after IP is clocked.

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Message-ID: <20150302170338.GC6976@x1>
Date:	Mon, 2 Mar 2015 17:03:38 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Peter Griffin <peter.griffin@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	maxime.coquelin@...com, patrice.chotard@...com,
	srinivas.kandagatla@...il.com, tj@...nel.org,
	linux-ide@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 3/3] ahci: st: st_configure_oob must be called after IP
 is clocked.

On Mon, 02 Mar 2015, Peter Griffin wrote:

> Currently the ahci_st driver will hang the system on probe, as the
> st_configure_oob function does some register writes before the IP
> is clocked. This patch moves the function call to after
> ahci_platform_enable_resources (which enables the IP clock), and
> resolves the hang.
> 
> Addtionally st_ahci_configure_oob should be called in the st_ahci_resume
> function, so we also rectify that ensuring it is also called after
> the IP clock has been enabled.
> 
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> ---
>  drivers/ata/ahci_st.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

I suspect we might find a few issues like this now we're not using
'clk_ignore_unused'.

Acked-by: Lee Jones <lee.jones@...aro.org>
 
> diff --git a/drivers/ata/ahci_st.c b/drivers/ata/ahci_st.c
> index bc971af..ea0ff00 100644
> --- a/drivers/ata/ahci_st.c
> +++ b/drivers/ata/ahci_st.c
> @@ -68,8 +68,6 @@ static int st_ahci_deassert_resets(struct device *dev)
>  		}
>  	}
>  
> -	st_ahci_configure_oob(drv_data->hpriv->mmio);
> -
>  	if (drv_data->sw_rst) {
>  		err = reset_control_deassert(drv_data->sw_rst);
>  		if (err) {
> @@ -172,6 +170,8 @@ static int st_ahci_probe(struct platform_device *pdev)
>  	if (err)
>  		return err;
>  
> +	st_ahci_configure_oob(drv_data->hpriv->mmio);
> +
>  	err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
>  				      &ahci_platform_sht);
>  	if (err) {
> @@ -222,6 +222,8 @@ static int st_ahci_resume(struct device *dev)
>  		return err;
>  	}
>  
> +	st_ahci_configure_oob(drv_data->hpriv->mmio);
> +
>  	return ahci_platform_resume_host(dev);
>  }
>  #endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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