linux-kernel - Re: [PATCH] etnaviv: setup missing dma

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Date:   Tue, 11 Sep 2018 15:33:12 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "etnaviv@...ts.freedesktop.org" <etnaviv@...ts.freedesktop.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "hch@....de" <hch@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "christian.gmeiner@...il.com" <christian.gmeiner@...il.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux+etnaviv@...linux.org.uk" <linux+etnaviv@...linux.org.uk>
Subject: Re: [PATCH] etnaviv: setup missing dma_mask

Hi Lucas,

Maybe you have any comments or remarks about this patch? And if you don't could you please apply it.

Thanks!

On Thu, 2018-08-23 at 19:38 +0300, Eugeniy Paltsev wrote:
> As for today etnaviv device doesn't setup dma_mask.
> The etnaviv device is a virtual device not represented in DT
> so missing dma_mask isn't setup by generic plaform code
> (by of_dma_configure function).
> 
> Missing dma_mask causes fails in some dma cache ops functions.
> For example it causes fails on map_* operations in generic
> dma_noncoherent_ops and dma_direct_ops.
> 
> We faced with this behaviour after switching ARC to generic
> dma_noncoherent cache ops using.
> 
> So fix this by setting dma_mask via dma_coerce_mask_and_coherent()
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> index 540b59fb4103..69d80937e021 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> @@ -593,7 +593,7 @@ static int etnaviv_pdev_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct component_match *match = NULL;
>  
> -	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +	dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
>  
>  	if (!dev->platform_data) {
>  		struct device_node *core_node;
-- 
 Eugeniy Paltsev