linux-kernel - Re: [v5,6/6] usb: dwc3: Do not set dma coherent mask

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Date:   Tue, 13 Dec 2016 17:09:52 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...ia.com>
To:     Sriram Dash <sriram.dash@....com>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>
CC:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <suresh.gupta@....com>, <felipe.balbi@...ux.intel.com>,
        <stern@...land.harvard.edu>, <pku.leo@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [v5,6/6] usb: dwc3: Do not set dma coherent mask

Hi!

On 17/11/16 12:43, Sriram Dash wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The dma mask is correctly set up by the DT probe function, no
> need to override it any more.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Sriram Dash <sriram.dash@....com>

Successfully tested on arm64/axxia with DWC3 USB host, XHCIs properly inherit
DMA configuration. Therefore:

Tested-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>

> ---
> Changes in v5:
>   - No update
> 
> Changes in v4:
>   - No update
> 
> Changes in v3:
>   - No update
> 
> Changes in v2:
>   - club the cleanup for dma coherent mask for device
> 
>  drivers/usb/dwc3/dwc3-exynos.c | 10 ----------
>  drivers/usb/dwc3/dwc3-st.c     |  1 -
>  2 files changed, 11 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
> index 2f1fb7e..e27899b 100644
> --- a/drivers/usb/dwc3/dwc3-exynos.c
> +++ b/drivers/usb/dwc3/dwc3-exynos.c
> @@ -20,7 +20,6 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  #include <linux/platform_device.h>
> -#include <linux/dma-mapping.h>
>  #include <linux/clk.h>
>  #include <linux/usb/otg.h>
>  #include <linux/usb/usb_phy_generic.h>
> @@ -117,15 +116,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
>  	if (!exynos)
>  		return -ENOMEM;
>  
> -	/*
> -	 * Right now device-tree probed devices don't get dma_mask set.
> -	 * Since shared usb code relies on it, set it here for now.
> -	 * Once we move to full device tree support this will vanish off.
> -	 */
> -	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> -	if (ret)
> -		return ret;
> -
>  	platform_set_drvdata(pdev, exynos);
>  
>  	exynos->dev	= dev;
> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
> index 89a2f71..4d7439c 100644
> --- a/drivers/usb/dwc3/dwc3-st.c
> +++ b/drivers/usb/dwc3/dwc3-st.c
> @@ -218,7 +218,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  
> -	dma_set_coherent_mask(dev, dev->coherent_dma_mask);
>  	dwc3_data->dev = dev;
>  	dwc3_data->regmap = regmap;
>  
> 

-- 
Best regards,
Alexander Sverdlin.