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FAILED: patch "[PATCH] drm/vc4: hdmi: Check the device state in prepare()" failed to apply to 5.15-stable tree

PATCH [email protected] 1 participant 1 message Jan 24, 2022

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Stable branch DRM drivers DRM misc DRM drivers for VC4
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The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a64ff88cb5eb0b9a6855a24ff326e948931e3a8e Mon Sep 17 00:00:00 2001
From: Maxime Ripard <[email protected]>
Date: Mon, 25 Oct 2021 16:11:11 +0200
Subject: [PATCH] drm/vc4: hdmi: Check the device state in prepare()

Even though we already check that the encoder->crtc pointer is there during in startup(), which is part of the open() path in ASoC, nothing guarantees that our encoder state won't change between the time when we open the device and the time we prepare it.

Move the sanity checks we do in startup() to a helper and call it from prepare().

Link https://lore.kernel.org/r/[email protected] open here
Fixes 91e99e113929 ("drm/vc4: hdmi: Register HDMI codec")
Acked-by Daniel Vetter <[email protected]>
Signed-off-by Maxime Ripard <[email protected]>
drivers/gpu/drm/vc4/vc4_hdmi.c +28 -7
index 71e3d1044d84..0adaa6f7eaef 100644
@@ -1395,20 +1395,36 @@ static inline struct vc4_hdmi *dai_to_hdmi(struct snd_soc_dai *dai)
 	return snd_soc_card_get_drvdata(card);
 }
 
+static bool vc4_hdmi_audio_can_stream(struct vc4_hdmi *vc4_hdmi)
+{
+	struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;
+
+	lockdep_assert_held(&vc4_hdmi->mutex);
+
+	/*
+	 * The encoder doesn't have a CRTC until the first modeset.
+	 */
+	if (!encoder->crtc)
+		return false;
+
+	/*
+	 * If the encoder is currently in DVI mode, treat the codec DAI
+	 * as missing.
+	 */
+	if (!(HDMI_READ(HDMI_RAM_PACKET_CONFIG) & VC4_HDMI_RAM_PACKET_ENABLE))
+		return false;
+
+	return true;
+}
+
 static int vc4_hdmi_audio_startup(struct device *dev, void *data)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
-	struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;
 	unsigned long flags;
 
 	mutex_lock(&vc4_hdmi->mutex);
 
-	/*
-	 * If the HDMI encoder hasn't probed, or the encoder is
-	 * currently in DVI mode, treat the codec dai as missing.
-	 */
-	if (!encoder->crtc || !(HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
-				VC4_HDMI_RAM_PACKET_ENABLE)) {
+	if (!vc4_hdmi_audio_can_stream(vc4_hdmi)) {
 		mutex_unlock(&vc4_hdmi->mutex);
 		return -ENODEV;
 	}

@@ -1538,6 +1554,11 @@ static int vc4_hdmi_audio_prepare(struct device *dev, void *data,
 
 	mutex_lock(&vc4_hdmi->mutex);
 
+	if (!vc4_hdmi_audio_can_stream(vc4_hdmi)) {
+		mutex_unlock(&vc4_hdmi->mutex);
+		return -EINVAL;
+	}
+
 	vc4_hdmi_audio_set_mai_clock(vc4_hdmi, sample_rate);
 
 	spin_lock_irqsave(&vc4_hdmi->hw_lock, flags);