[PATCH] usb: dwc2: workaround: disable DMA for gadget

[Ruslan Bilovol]

On Raspberry PI 4 it was observer that in case of control
transfers with DATA phase from a host, the driver for some
reason doesn't copy transferred data to the buffer, leaving
previous data in it.

With disabled DMA the issue isn't reproducible, thus
temporarily disable it

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@xxxxxxxxx>
---
 drivers/usb/dwc2/params.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index 267543c..46c18af 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -357,7 +357,11 @@ static void dwc2_set_default_params(struct
dwc2_hsotg *hsotg)
 {
  struct dwc2_hw_params *hw = &hsotg->hw_params;
  struct dwc2_core_params *p = &hsotg->params;
+#if 0
  bool dma_capable = !(hw->arch == GHWCFG2_SLAVE_ONLY_ARCH);
+#else
+ bool dma_capable = 0;
+#endif

  dwc2_set_param_otg_cap(hsotg);
  dwc2_set_param_phy_type(hsotg);
@@ -651,7 +655,11 @@ static void dwc2_check_params(struct dwc2_hsotg *hsotg)
 {
  struct dwc2_hw_params *hw = &hsotg->hw_params;
  struct dwc2_core_params *p = &hsotg->params;
+#if 0
  bool dma_capable = !(hw->arch == GHWCFG2_SLAVE_ONLY_ARCH);
+#else
+ bool dma_capable = 0;
+#endif

  dwc2_check_param_otg_cap(hsotg);
  dwc2_check_param_phy_type(hsotg);
-- 
1.9.1