[PATCH] drm: bridge: cdns-mhdp8546: fix compile warning

[Laurent Pinchart]

Hi Tomi,

Thank you for the patch.

On Wed, Sep 23, 2020 at 11:30:57AM +0300, Tomi Valkeinen wrote:
> On x64 we get:
> 
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:751:10: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551613' to '4294967293' [-Woverflow]
> 
> The registers are 32 bit, so fix by casting to u32.

I wonder if we need a BIT32 macro... This is a common issue, it would be
nice to handle it in the macros that define register fields.

> Fixes: fb43aa0acdfd ("drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge")
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
> ---
>  drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index 621ebdbff8a3..d0c65610ebb5 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -748,7 +748,7 @@ static int cdns_mhdp_fw_activate(const struct firmware *fw,
>  	 * bridge should already be detached.
>  	 */
>  	if (mhdp->bridge_attached)
> -		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> +		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
>  		       mhdp->regs + CDNS_APB_INT_MASK);
>  
>  	spin_unlock(&mhdp->start_lock);
> @@ -1689,7 +1689,7 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge,
>  
>  	/* Enable SW event interrupts */
>  	if (hw_ready)
> -		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> +		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
>  		       mhdp->regs + CDNS_APB_INT_MASK);
>  
>  	return 0;
> @@ -2122,7 +2122,7 @@ static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge)
>  
>  	/* Enable SW event interrupts */
>  	if (mhdp->bridge_attached)
> -		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> +		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
>  		       mhdp->regs + CDNS_APB_INT_MASK);
>  }
>  

-- 
Regards,

Laurent Pinchart