linux-kernel - Re: [PATCH] [media] omap4iss: avoid broken OMAP4 dependency

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Date:	Sun, 12 Apr 2015 15:22:24 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-media@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
	Tero Kristo <t-kristo@...com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] [media] omap4iss: avoid broken OMAP4 dependency

Hi Arnd,

Thank you for the patch.

On Friday 10 April 2015 22:20:20 Arnd Bergmann wrote:
> The omap4iss driver uses an interface that used to be provided
> by OMAP4 but has now been removed and replaced with a WARN_ON(1)
> statement, which likely broke the iss_csiphy code at runtime.
> 
> It also broke compiling the driver when CONFIG_ARCH_OMAP2PLUS
> is set, which is implied by OMAP4:
> 
> drivers/staging/media/omap4iss/iss_csiphy.c: In function
> 'omap4iss_csiphy_config':
> drivers/staging/media/omap4iss/iss_csiphy.c:167:2: error: implicit
> declaration of function 'omap4_ctrl_pad_writel'
> [-Werror=implicit-function-declaration] omap4_ctrl_pad_writel(cam_rx_ctrl,
>
> In turn, this broke ARM allyesconfig builds. Replacing the
> omap4_ctrl_pad_writel call with WARN_ON(1) won't make the
> situation any worse than it already is, but fixes the build
> problem.

I've fixed the problem properly by switching to the syscon API. I'll send the 
patch as a separate reply, let's discuss there how to handle the issue.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: efde234674d9 ("ARM: OMAP4+: control: remove support for legacy pad
> read/write")
> ---
> diff --git a/drivers/staging/media/omap4iss/iss_csiphy.c
> b/drivers/staging/media/omap4iss/iss_csiphy.c index
> 7c3d55d811ef..24f56ed90ac3 100644
> --- a/drivers/staging/media/omap4iss/iss_csiphy.c
> +++ b/drivers/staging/media/omap4iss/iss_csiphy.c
> 
> @@ -140,9 +140,7 @@ int omap4iss_csiphy_config(struct iss_device *iss,
>  	 * - bit [18] : CSIPHY1 CTRLCLK enable
>  	 * - bit [17:16] : CSIPHY1 config: 00 d-phy, 01/10 ccp2
>  	 */
> -	cam_rx_ctrl = omap4_ctrl_pad_readl(
> -			OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
> -
> +	cam_rx_ctrl = WARN_ON(1);
> 
>  	if (subdevs->interface == ISS_INTERFACE_CSI2A_PHY1) {
>  		cam_rx_ctrl &= ~(OMAP4_CAMERARX_CSI21_LANEENABLE_MASK |
> @@ -166,8 +164,7 @@ int omap4iss_csiphy_config(struct iss_device *iss,
>  		cam_rx_ctrl |= OMAP4_CAMERARX_CSI22_CTRLCLKEN_MASK;
>  	}
> 
> -	omap4_ctrl_pad_writel(cam_rx_ctrl,
> -		 OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_CAMERA_RX);
> +	WARN_ON(1);
> 
>  	/* Reset used lane count */
>  	csi2->phy->used_data_lanes = 0;

-- 
Regards,

Laurent Pinchart

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