The audio data is sent to rpi's VideoCore IV trough VCHIQ. We make sure it's available and that we fail gracefully in case it isn't there.
Signed-off-by: Nicolas Saenz Julienne <[email protected]> --- drivers/staging/vc04_services/bcm2835-audio/bcm2835.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c index 039565311d10..f4b19a4a974b 100644 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c @@ -294,9 +294,19 @@ static int snd_add_child_devices(struct device *device, u32 numchans) static int snd_bcm2835_alsa_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct device_node *fw_node; u32 numchans; int err; + fw_node = of_find_compatible_node(NULL, NULL, "brcm,bcm2835-vchiq"); + if (!fw_node) { + dev_err(&pdev->dev, "no vchiq firmware node\n"); + return -ENODEV; + } + + if (!vchi_ready(fw_node)) + return -EPROBE_DEFER; + err = of_property_read_u32(dev->of_node, "brcm,pwm-channels", &numchans); if (err) { -- 2.19.1
