Now that the gadget driver automatically detects DMA modes, we need to
provide a way to disable them. Certain platforms may still have issues
with DMA and require it to be disabled. It is also needed for IP
validation purposes.
Signed-off-by: John Youn
---
Documentation/devicetree/bindings/usb/dwc2.txt | 2 ++
drivers/usb/dwc2/params.c | 9 +++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt
b/Documentation/devicetree/bindings/usb/dwc2.txt
index 389bb13..10a2a4b 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -26,6 +26,8 @@ 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,host-dma-disable: disable host DMA mode.
+- snps,gadget-dma-disable: disable gadget DMA mode.
+- snps,gadget-dma-desc-disable: disable gadget DMA descriptor mode.
- 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.
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 2f18a7b..64d5c66 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -1091,17 +1091,22 @@ static void dwc2_set_gadget_dma(struct dwc2_hsotg
*hsotg)
struct dwc2_hw_params *hw = &hsotg->hw_params;
struct dwc2_core_params *p = &hsotg->params;
bool dma_capable = !(hw->arch == GHWCFG2_SLAVE_ONLY_ARCH);
+ bool disable;
/* Buffer DMA */
+ disable = device_property_read_bool(hsotg->dev,
+ "snps,gadget-dma-disable");
dwc2_set_param_bool(hsotg, &p->g_dma,
false, "gadget-dma",
- true, false,
+ !disable, false,
dma_capable);
/* DMA Descriptor */
+ disable = device_property_read_bool(hsotg->dev,
+ "snps,gadget-dma-desc-disable");
dwc2_set_param_bool(hsotg, &p->g_dma_desc, false,
"gadget-dma-desc",
- p->g_dma, false,
+ p->g_dma && !disable, false,
!!hw->dma_desc_enable);
}
--
2.10.0
--
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