From 91062e663b261815573ce00967b1895a99e668df Mon Sep 17 00:00:00 2001 From: William Wu Date: Thu, 1 Sep 2022 16:34:46 +0800 Subject: usb: dwc3: core: leave default DMA if the controller does not support 64-bit DMA 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") Cc: stable Reviewed-by: Sven Peter Signed-off-by: William Wu Link: https://lore.kernel.org/r/20220901083446.3799754-1-william.wu@rock-chips.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/core.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 8c8e32651473..d0237b30c9be 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1752,12 +1752,6 @@ 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) platform_set_drvdata(pdev, dwc); dwc3_cache_hwparams(dwc); + 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); -- cgit v1.2.3