On some DWC3 controllers (e.g. Rockchip SoCs), the DWC3 core
doesn't support 64-bit DMA address width. In this case, this
driver should use the default 32-bit mask. Otherwise, the DWC3
controller will break if it runs on above 4GB physical memory
environment.
This patch reads the DWC_USB3_AWIDTH bits of GHWPARAMS0 which
used for the DMA address width, and only configure 64-bit DMA
mask if the DWC_USB3_AWIDTH is 64.
Fixes: 45d39448b4d0 ("usb: dwc3: support 64 bit DMA in platform driver")
Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c5c238ab3083..2fcbd05b2af1 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1751,12 +1751,6 @@ static int dwc3_probe(struct platform_device *pdev)
dwc3_get_properties(dwc);
- if (!dwc->sysdev_is_parent) {
- ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
- if (ret)
- return ret;
- }
-
dwc->reset = devm_reset_control_array_get_optional_shared(dev);
if (IS_ERR(dwc->reset))
return PTR_ERR(dwc->reset);
@@ -1823,6 +1817,13 @@ static int dwc3_probe(struct platform_device *pdev)
dwc3_cache_hwparams(dwc);
device_init_wakeup(&pdev->dev, of_property_read_bool(dev->of_node, "wakeup-source"));
+ if (!dwc->sysdev_is_parent &&
+ DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) {
+ ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
+ if (ret)
+ goto disable_clks;
+ }
+
spin_lock_init(&dwc->lock);
mutex_init(&dwc->mutex);
--
2.34.1
