drm/tegra: sor: Extract common audio enabling code

The code to enable audio support is split into two parts, one being
generic for the SOR and another part that is specific whether the SOR is
in HDMI mode or in DP mode. Split out the common part in preparation for
reusing the code in DP mode.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -2002,6 +2002,30 @@ static void tegra_sor_audio_unprepare(struct tegra_sor *sor)
 	tegra_sor_writel(sor, 0, SOR_INT_ENABLE);
 }
 
+static void tegra_sor_audio_enable(struct tegra_sor *sor)
+{
+	u32 value;
+
+	value = tegra_sor_readl(sor, SOR_AUDIO_CNTRL);
+
+	/* select HDA audio input */
+	value &= ~SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_MASK);
+	value |= SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_HDA);
+
+	/* inject null samples */
+	if (sor->format.channels != 2)
+		value &= ~SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
+	else
+		value |= SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
+
+	value |= SOR_AUDIO_CNTRL_AFIFO_FLUSH;
+
+	tegra_sor_writel(sor, value, SOR_AUDIO_CNTRL);
+
+	/* enable advertising HBR capability */
+	tegra_sor_writel(sor, SOR_AUDIO_SPARE_HBR_ENABLE, SOR_AUDIO_SPARE);
+}
+
 static int tegra_sor_hdmi_enable_audio_infoframe(struct tegra_sor *sor)
 {
 	u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
@@ -2037,24 +2061,7 @@ static void tegra_sor_hdmi_audio_enable(struct tegra_sor *sor)
 {
 	u32 value;
 
-	value = tegra_sor_readl(sor, SOR_AUDIO_CNTRL);
-
-	/* select HDA audio input */
-	value &= ~SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_MASK);
-	value |= SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_HDA);
-
-	/* inject null samples */
-	if (sor->format.channels != 2)
-		value &= ~SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
-	else
-		value |= SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
-
-	value |= SOR_AUDIO_CNTRL_AFIFO_FLUSH;
-
-	tegra_sor_writel(sor, value, SOR_AUDIO_CNTRL);
-
-	/* enable advertising HBR capability */
-	tegra_sor_writel(sor, SOR_AUDIO_SPARE_HBR_ENABLE, SOR_AUDIO_SPARE);
+	tegra_sor_audio_enable(sor);
 
 	tegra_sor_writel(sor, 0, SOR_HDMI_ACR_CTRL);