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drm/vc4: hdmi: Disable audio if dmas property is present but empty

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The dmas property is used to hold the dmaengine channel used for audio
output.

Older device trees were missing that property, so if it's not there we
disable the audio output entirely.

However, some overlays have set an empty value to that property, mostly
to workaround the fact that overlays cannot remove a property. Let's add
a test for that case and if it's empty, let's disable it as well.

Cc: <stable@vger.kernel.org>
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Link: https://lore.kernel.org/r/20220613144800.326124-18-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Phil Elwell 2022-06-13 16:47:44 +02:00 committed by Maxime Ripard
parent 7bcb9c8d0b
commit db2b927f86
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GPG Key ID: E3EF0D6F671851C5
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -2035,12 +2035,12 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
struct device *dev = &vc4_hdmi->pdev->dev;
struct platform_device *codec_pdev;
const __be32 *addr;
int index;
int index, len;
int ret;
if (!of_find_property(dev->of_node, "dmas", NULL)) {
if (!of_find_property(dev->of_node, "dmas", &len) || !len) {
dev_warn(dev,
"'dmas' DT property is missing, no HDMI audio\n");
"'dmas' DT property is missing or empty, no HDMI audio\n");
return 0;
}