diff --git a/firmware/export/config/samsungypcp3.h b/firmware/export/config/samsungypcp3.h
index 658b327165..f3542f64f6 100644
--- a/firmware/export/config/samsungypcp3.h
+++ b/firmware/export/config/samsungypcp3.h
@@ -94,13 +94,15 @@
 #define CONFIG_LCD LCD_SPFD5420A
 
 /* Wolfson WM8750 on I2C, headphones on its OUT2. The codec is the I2S
- * slave: the rk27xx drives the bus and clocks the codec from its codec PLL
- * at 256 fs for every rate (pcm-rk27xx.c), so the codec's CLOCKING register
- * is its normal-mode 256 fs setting throughout. The original firmware runs
- * the codec as master off a fixed 12 MHz instead, in USB mode, which puts
+ * master, driving BCLK and both of its LRCKs: as a slave it frames the ADC
+ * on its ADCLRC input, which the rk27xx's one LRCK does not reach, and
+ * records zeros. Its MCLK comes from the rk27xx's codec PLL at 256 fs for
+ * every rate (pcm-rk27xx.c), so the codec's CLOCKING register is its
+ * normal-mode 256 fs setting throughout. The original firmware runs the
+ * codec as master off a fixed 12 MHz instead, in USB mode, which puts
  * 44.1 kHz at 44.118. */
 #define HAVE_WM8750
-#define CODEC_SLAVE
+#define RK27XX_I2S_MCLK
 #define CODEC_SRCTRL_11025HZ 0
 #define CODEC_SRCTRL_22050HZ 0
 #define CODEC_SRCTRL_44100HZ 0
diff --git a/firmware/target/arm/rk27xx/pcm-rk27xx.c b/firmware/target/arm/rk27xx/pcm-rk27xx.c
index 2aa5979ce8..2040663a76 100644
--- a/firmware/target/arm/rk27xx/pcm-rk27xx.c
+++ b/firmware/target/arm/rk27xx/pcm-rk27xx.c
@@ -196,8 +196,9 @@ static void i2s_init(void)
 #endif
 }
 
-#ifdef CODEC_SLAVE
-/* When codec is slave we need to setup i2s MCLK clock using codec pll.
+#if defined(CODEC_SLAVE) || defined(RK27XX_I2S_MCLK)
+/* When codec is slave, or master off our MCLK (RK27XX_I2S_MCLK), we need
+ * to setup i2s MCLK clock using codec pll.
  * The MCLK frequency is 256*codec frequency as i2s setup is:
  * LRCK/SCLK = 64 and MCLK/SCLK = 4 (see i2s_init() for reference)
  *
@@ -278,7 +279,7 @@ static void sink_dma_init(void)
 
 static void sink_set_freq(uint16_t freq)
 {
-#ifdef CODEC_SLAVE
+#if defined(CODEC_SLAVE) || defined(RK27XX_I2S_MCLK)
     set_codec_freq(freq);
 #endif