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 <johnyoun@xxxxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
