[PATCH v3 0/4] usb: dwc2: Add AHB burst configuration

[PATCH v3 0/4] usb: dwc2: Add AHB burst configuration

[John Youn]

This series adds a binding for AHB burst, reads it in, and configures
the controller for the specified burst type.

Tested on HAPS platform with DWC_hsotg IP version 3.30a.

v3:
* Split out binding documentation
* Squash bcm2835 comment with binding implementation
* Add warning for bcm2835

v2:
* Don't remove the bcm2835 ahbcfg param and document why.


John Youn (4):
  Documentation: devictree: dwc2: Add AHB burst binding
  usb: dwc2: Read in the AHB burst property
  usb: dwc2: Use the ahb_burst param
  usb: dwc2: pci: Add AHB burst property for HAPS

 Documentation/devicetree/bindings/usb/dwc2.txt |  2 +
 drivers/usb/dwc2/core.h                        |  9 +++
 drivers/usb/dwc2/gadget.c                      |  2 +-
 drivers/usb/dwc2/hcd.c                         |  8 +--
 drivers/usb/dwc2/params.c                      | 79 ++++++++++++++++++++++----
 drivers/usb/dwc2/pci.c                         |  1 +
 6 files changed, 85 insertions(+), 16 deletions(-)

-- 
2.10.0

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[PATCH v3 0/4] usb: dwc2: Add AHB burst configuration

[John Youn]

This series adds a binding for AHB burst, reads it in, and configures
the controller for the specified burst type.

Tested on HAPS platform with DWC_hsotg IP version 3.30a.

v3:
* Split out binding documentation
* Squash bcm2835 comment with binding implementation
* Add warning for bcm2835

v2:
* Don't remove the bcm2835 ahbcfg param and document why.


John Youn (4):
  Documentation: devictree: dwc2: Add AHB burst binding
  usb: dwc2: Read in the AHB burst property
  usb: dwc2: Use the ahb_burst param
  usb: dwc2: pci: Add AHB burst property for HAPS

 Documentation/devicetree/bindings/usb/dwc2.txt |  2 +
 drivers/usb/dwc2/core.h                        |  9 +++
 drivers/usb/dwc2/gadget.c                      |  2 +-
 drivers/usb/dwc2/hcd.c                         |  8 +--
 drivers/usb/dwc2/params.c                      | 79 ++++++++++++++++++++++----
 drivers/usb/dwc2/pci.c                         |  1 +
 6 files changed, 85 insertions(+), 16 deletions(-)

-- 
2.10.0

--
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[PATCH v3 1/4] Documentation: devictree: dwc2: Add AHB burst binding

[John Youn]

Add the "snps,ahb-burst" property which controls the burst type to
perform on the AHB bus as a master in internal DMA mode.

Some platforms may see better or worse performance based on this
value. The HAPS platform is one example where all INCRx have worse
performance than INCR.

Other platforms (such as the Canyonlands board) report that the default
value causes system hangs.

Signed-off-by: John Youn <johnyoun-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
Cc: Christian Lamparter <chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/dwc2.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt b/Documentation/devicetree/bindings/usb/dwc2.txt
index 6c7c2bce..9e7b4b4 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -26,6 +26,8 @@ Optional properties:
 Refer to phy/phy-bindings.txt for generic phy consumer properties
 - dr_mode: shall be one of "host", "peripheral" and "otg"
   Refer to usb/generic.txt
+- snps,ahb-burst: specifies the ahb burst length. Valid arguments are:
+  "SINGLE", "INCR", "INCR4", "INCR8", "INCR16". Defaults to "INCR4".
 - g-rx-fifo-size: size of rx fifo size in gadget mode.
 - g-np-tx-fifo-size: size of non-periodic tx fifo size in gadget mode.
 - g-tx-fifo-size: size of periodic tx fifo per endpoint (except ep0) in gadget mode.
-- 
2.10.0

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