linux-kernel - Re: [PATCH] usb: dwc3: Initialize DMA ops/mask for xhci-hcd

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Date:   Mon, 28 Aug 2017 11:31:36 -0400
From:   Adam Wallis <awallis@...eaurora.org>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        linux-arm-kernel@...ts.infradead.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     timur@...eaurora.org
Subject: Re: [PATCH] usb: dwc3: Initialize DMA ops/mask for xhci-hcd

On 8/25/2017 7:03 PM, Grygorii Strashko wrote:
> 
> 
> On 08/25/2017 01:02 PM, Adam Wallis wrote:
>> The dma ops from the parent DWC device are not getting passed to the
>> child xhci-hcd device. This patch makes use of
>> platform_device_register_full to set the DMA ops. For the DT/OF case,
>> dma_ops were still null after the the device register, so
>> of_dma_configure is called in only the OF case.
>>
>> Signed-off-by: Adam Wallis <awallis@...eaurora.org>
> 
> Hm. There were set of fixes in this area recently which actually removed
> settings you are going to restore

The set of fixes works for DWC if it is a child device, but in my testing, those
DMA settings do not get propagated to the created xHCI-hcd child device (which
is instantiated in dwc3_host_init). I see the same behavior with ACPI and
Device-Tree/OF boot.

> 
> 4c39d4b usb: xhci: use bus->sysdev for DMA configuration
> 
> d64ff40 usb: dwc3: use bus->sysdev for DMA configuration
> 
>> ---
>>   drivers/usb/dwc3/host.c | 39 +++++++++++++++++----------------------
>>   1 file changed, 17 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
>> index 76f0b0d..662e9e2 100644
>> --- a/drivers/usb/dwc3/host.c
>> +++ b/drivers/usb/dwc3/host.c
>> @@ -16,6 +16,7 @@
>>    */
>>     #include <linux/platform_device.h>
>> +#include <linux/of_platform.h>
>>     #include "core.h"
>>   @@ -56,6 +57,7 @@ int dwc3_host_init(struct dwc3 *dwc)
>>   {
>>       struct property_entry    props[3];
>>       struct platform_device    *xhci;
>> +    struct platform_device_info dwc_plat_info = {};
>>       int            ret, irq;
>>       struct resource        *res;
>>       struct platform_device    *dwc3_pdev = to_platform_device(dwc->dev);
>> @@ -79,22 +81,22 @@ int dwc3_host_init(struct dwc3 *dwc)
>>       dwc->xhci_resources[1].flags = res->flags;
>>       dwc->xhci_resources[1].name = res->name;
>>   -    xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
>> -    if (!xhci) {
>> -        dev_err(dwc->dev, "couldn't allocate xHCI device\n");
>> -        return -ENOMEM;
>> -    }
>> +    dwc_plat_info.name = "xhci-hcd";
>> +    dwc_plat_info.parent = dwc->dev;
>> +    dwc_plat_info.res = dwc->xhci_resources;
>> +    dwc_plat_info.num_res = DWC3_XHCI_RESOURCES_NUM;
>> +    dwc_plat_info.fwnode = dwc->dev->fwnode;
>> +    dwc_plat_info.dma_mask = *dwc->dev->dma_mask;
>>   -    xhci->dev.parent    = dwc->dev;
>> +    xhci = platform_device_register_full(&dwc_plat_info);
>> +    if (IS_ERR(xhci)) {
>> +        dev_err(dwc->dev, "failed to register xHCI device\n");
>> +        return PTR_ERR(xhci);
>> +    }
>>         dwc->xhci = xhci;
>> -
>> -    ret = platform_device_add_resources(xhci, dwc->xhci_resources,
>> -                        DWC3_XHCI_RESOURCES_NUM);
>> -    if (ret) {
>> -        dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
>> -        goto err1;
>> -    }
>> +    if (dwc->dev->of_node)
>> +        of_dma_configure(&xhci->dev, dwc->dev->of_node);
>>         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
>>   @@ -117,7 +119,7 @@ int dwc3_host_init(struct dwc3 *dwc)
>>           ret = platform_device_add_properties(xhci, props);
>>           if (ret) {
>>               dev_err(dwc->dev, "failed to add properties to xHCI\n");
>> -            goto err1;
>> +            goto err;
>>           }
>>       }
>>   @@ -126,19 +128,12 @@ int dwc3_host_init(struct dwc3 *dwc)
>>       phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
>>                 dev_name(dwc->dev));
>>   -    ret = platform_device_add(xhci);
>> -    if (ret) {
>> -        dev_err(dwc->dev, "failed to register xHCI device\n");
>> -        goto err2;
>> -    }
>> -
>>       return 0;
>> -err2:
>> +err:
>>       phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
>>                 dev_name(dwc->dev));
>>       phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
>>                 dev_name(dwc->dev));
>> -err1:
>>       platform_device_put(xhci);
>>       return ret;
>>   }
>>
> 


-- 
Adam Wallis
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.