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7b81cb6bdd
linux/drivers/usb/renesas_usbhs
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Christoph Hellwig 7b81cb6bdd usb: add a HCD_DMA flag instead of guestimating DMA capabilities 
The usb core is the only major place in the kernel that checks for
a non-NULL device dma_mask to see if a device is DMA capable.  This
is generally a bad idea, as all major busses always set up a DMA mask,
even if the device is not DMA capable - in fact bus layers like PCI
can't even know if a device is DMA capable at enumeration time.  This
leads to lots of workaround in HCD drivers, and also prevented us from
setting up a DMA mask for platform devices by default last time we
tried.

Replace this guess with an explicit HCD_DMA that is set by drivers that
appear to have DMA support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190816062435.881-4-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-21 10:03:35 -07:00
..
common.c usb: renesas_usbhs: Use struct platform_callback pointer 2019-06-26 10:33:09 +08:00
common.h usb: renesas_usbhs: Use struct platform_callback pointer 2019-06-26 10:33:09 +08:00
fifo.c USB: more changes for v5.3 merge window 2019-07-03 13:48:54 +02:00
fifo.h USB: renesas_usbhs: Remove redundant license text 2017-11-07 15:45:01 +01:00
Kconfig usb: remove redundant 'default n' from Kconfig-s 2019-05-21 10:06:22 +02:00
Makefile usb: renesas_usbhs: Add support for RZ/A2 2019-05-21 10:25:59 +02:00
mod_gadget.c usb: renesas_usbhs: Avoid to write platform_data's value 2019-06-26 10:33:08 +08:00
mod_host.c usb: add a HCD_DMA flag instead of guestimating DMA capabilities 2019-08-21 10:03:35 -07:00
mod.c usb: renesas_usbhs: Use struct platform_callback pointer 2019-06-26 10:33:09 +08:00
mod.h usb: renesas_usbhs: Avoid to write platform_data's value 2019-06-26 10:33:08 +08:00
pipe.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
pipe.h usb: renesas_usbhs: add usbhs_pipe_clear_without_sequence() function 2017-12-12 13:04:09 +02:00
rcar2.c usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rcar2.h usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rcar3.c usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rcar3.h usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rza2.c usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rza.c usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00
rza.h usb: renesas_usbhs: Use renesas_usbhs_platform_info on of_device_id.data 2019-06-26 10:33:09 +08:00