staging: dwc2: disable dma when no dma_mask was setup

If the platform or bus driver failed to setup a dma_mask, but the
hardware advertises support for DMA, before DMA would be enabled in
dwc2, but disabled in the usb core, making all connectivity break.

With this commit, the dwc2 driver will emit a warning and fall back to
slave mode in this case.

Note that since commit 642f2ec (staging: dwc2: Fix dma-enabled platform
devices using a default dma_mask) the platform bindings make sure a DMA
mask is always present, but having this check here anyway is probably a
good from a defensive programming standpoint (in case of changes to
platform.c or addition of new glue layers).

Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <Paul.Zimmerman@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dwc2/hcd.c b/drivers/staging/dwc2/hcd.c
index d4ef5f34c2a097a995b8714d01d61d808cc1b41d..f77e66333ac761d88001385cf40f14169a16d1ac 100644 (file)
--- a/drivers/staging/dwc2/hcd.c
+++ b/drivers/staging/dwc2/hcd.c
@@ -2830,6 +2830,15 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
        /* Validate parameter values */
        dwc2_set_parameters(hsotg, params);
 
+       /* Check if the bus driver or platform code has setup a dma_mask */
+       if (hsotg->core_params->dma_enable > 0 &&
+           hsotg->dev->dma_mask == NULL) {
+               dev_warn(hsotg->dev,
+                        "dma_mask not set, disabling DMA\n");
+               hsotg->core_params->dma_enable = 0;
+               hsotg->core_params->dma_desc_enable = 0;
+       }
+
        /* Set device flags indicating whether the HCD supports DMA */
        if (hsotg->core_params->dma_enable > 0) {
                if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)