drm/bridge: dw-hdmi-i2s: support more i2s format

The dw-hdmi-i2s supports more formats than just regular i2s.
Add support for left justified, right justified and dsp modes
A and B.
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812120726.1528-2-jbrunet@baylibre.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c

@@ -44,9 +44,8 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
 	u8 inputclkfs = 0;
 
 	/* it cares I2S only */
-	if ((fmt->fmt != HDMI_I2S) ||
-	    (fmt->bit_clk_master | fmt->frame_clk_master)) {
-		dev_err(dev, "unsupported format/settings\n");
+	if (fmt->bit_clk_master | fmt->frame_clk_master) {
+		dev_err(dev, "unsupported clock settings\n");
 		return -EINVAL;
 	}
 
@@ -63,6 +62,27 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
 		break;
 	}
 
+	switch (fmt->fmt) {
+	case HDMI_I2S:
+		conf1 |= HDMI_AUD_CONF1_MODE_I2S;
+		break;
+	case HDMI_RIGHT_J:
+		conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J;
+		break;
+	case HDMI_LEFT_J:
+		conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J;
+		break;
+	case HDMI_DSP_A:
+		conf1 |= HDMI_AUD_CONF1_MODE_BURST_1;
+		break;
+	case HDMI_DSP_B:
+		conf1 |= HDMI_AUD_CONF1_MODE_BURST_2;
+		break;
+	default:
+		dev_err(dev, "unsupported format\n");
+		return -EINVAL;
+	}
+
 	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
 
 	hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);

drivers/gpu/drm/bridge/synopsys/dw-hdmi.h

@@ -869,8 +869,10 @@ enum {
 
 /* AUD_CONF1 field values */
 	HDMI_AUD_CONF1_MODE_I2S = 0x00,
-	HDMI_AUD_CONF1_MODE_RIGHT_J = 0x02,
-	HDMI_AUD_CONF1_MODE_LEFT_J = 0x04,
+	HDMI_AUD_CONF1_MODE_RIGHT_J = 0x20,
+	HDMI_AUD_CONF1_MODE_LEFT_J = 0x40,
+	HDMI_AUD_CONF1_MODE_BURST_1 = 0x60,
+	HDMI_AUD_CONF1_MODE_BURST_2 = 0x80,
 	HDMI_AUD_CONF1_WIDTH_16 = 0x10,
 	HDMI_AUD_CONF1_WIDTH_24 = 0x18,