linux-kernel - Re: [PATCH] drm: xlnx: Use dma_request

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Message-ID: <20201029004140.GA2849549@xilinx.com>
Date:   Wed, 28 Oct 2020 17:41:40 -0700
From:   Hyun Kwon <hyun.kwon@...inx.com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
CC:     Hyun Kwon <hyunk@...inx.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hyun Kwon <hyun.kwon@...inx.com>
Subject: Re: [PATCH] drm: xlnx: Use dma_request_chan for DMA channel request

On Tue, Oct 27, 2020 at 06:36:02PM -0700, Hyun Kwon wrote:
> Hi Peter,
> 
> Thanks for the patch.
> 
> On Fri, Oct 23, 2020 at 02:46:02AM -0700, Peter Ujfalusi wrote:
> > There is no need to use the of_dma_request_slave_channel() directly as
> > dma_request_chan() is going to try to get the channel via OF as well.
> > 
> > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> 
> So now dma_request_chan() has sysfs / debugfs registrations, and this looks
> good to me. I'll commit this within next couple days and keep it posted here.
> 

Applied to drm-misc-next.

Thanks!

-hyun


> Thanks,
> -hyun
> 
> > ---
> >  drivers/gpu/drm/xlnx/zynqmp_disp.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> > index 98bd48f13fd1..a4405d081aca 100644
> > --- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
> > +++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c
> > @@ -28,7 +28,6 @@
> >  #include <linux/dmaengine.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > -#include <linux/of_dma.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/pm_runtime.h>
> >  #include <linux/spinlock.h>
> > @@ -1316,8 +1315,7 @@ static int zynqmp_disp_layer_request_dma(struct zynqmp_disp *disp,
> >  
> >  		snprintf(dma_channel_name, sizeof(dma_channel_name),
> >  			 "%s%u", dma_names[layer->id], i);
> > -		dma->chan = of_dma_request_slave_channel(disp->dev->of_node,
> > -							 dma_channel_name);
> > +		dma->chan = dma_request_chan(disp->dev, dma_channel_name);
> >  		if (IS_ERR(dma->chan)) {
> >  			dev_err(disp->dev, "failed to request dma channel\n");
> >  			ret = PTR_ERR(dma->chan);
> > -- 
> > Peter
> > 
> > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> > Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> >