drm/bridge/sii8620: send EMSC features on request

Device should report to the peer which features are really supported.
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1485935272-17337-22-git-send-email-a.hajda@samsung.com

drivers/gpu/drm/bridge/sil-sii8620.c

@@ -1676,6 +1676,25 @@ static void sii8620_got_ecbus_speed(struct sii8620 *ctx, int ret)
 	sii8620_mt_set_cont(ctx, sii8620_ecbus_up);
 }
 
+static void sii8620_mhl_burst_emsc_support_set(struct mhl_burst_emsc_support *d,
+	enum mhl_burst_id id)
+{
+	sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_EMSC_SUPPORT);
+	d->num_entries = 1;
+	d->burst_id[0] = cpu_to_be16(id);
+}
+
+static void sii8620_send_features(struct sii8620 *ctx)
+{
+	u8 buf[16];
+
+	sii8620_write(ctx, REG_MDT_XMIT_CTRL, BIT_MDT_XMIT_CTRL_EN
+		| BIT_MDT_XMIT_CTRL_FIXED_BURST_LEN);
+	sii8620_mhl_burst_emsc_support_set((void *)buf,
+		MHL_BURST_ID_HID_PAYLOAD);
+	sii8620_write_buf(ctx, REG_MDT_XMIT_WRITE_PORT, buf, ARRAY_SIZE(buf));
+}
+
 static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
 {
 	u8 ints[MHL_INT_SIZE];
@@ -1696,10 +1715,10 @@ static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
 			break;
 		}
 	}
-	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_REQ) {
-		sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
-				   MHL_INT_RC_FEAT_COMPLETE);
-	}
+	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_REQ)
+		sii8620_send_features(ctx);
+	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_COMPLETE)
+		sii8620_edid_read(ctx, 0);
 }
 
 static struct sii8620_mt_msg *sii8620_msc_msg_first(struct sii8620 *ctx)

drivers/gpu/drm/bridge/sil-sii8620.h

@@ -1298,14 +1298,14 @@
 
 /* MDT Transmit Control, default value: 0x70 */
 #define REG_MDT_XMIT_CTRL			0x0588
-#define BIT_MDT_XMIT_CTRL_MDT_XMIT_EN		BIT(7)
-#define BIT_MDT_XMIT_CTRL_MDT_XMIT_CMD_MERGE_EN	BIT(6)
-#define BIT_MDT_XMIT_CTRL_MDT_XMIT_FIXED_BURST_LEN BIT(5)
-#define BIT_MDT_XMIT_CTRL_MDT_XMIT_FIXED_AID	BIT(4)
-#define BIT_MDT_XMIT_CTRL_MDT_XMIT_SINGLE_RUN_EN BIT(3)
-#define BIT_MDT_XMIT_CTRL_MDT_CLR_ABORT_WAIT	BIT(2)
-#define BIT_MDT_XMIT_CTRL_MDT_XFIFO_CLR_ALL	BIT(1)
-#define BIT_MDT_XMIT_CTRL_MDT_XFIFO_CLR_CUR	BIT(0)
+#define BIT_MDT_XMIT_CTRL_EN			BIT(7)
+#define BIT_MDT_XMIT_CTRL_CMD_MERGE_EN		BIT(6)
+#define BIT_MDT_XMIT_CTRL_FIXED_BURST_LEN	BIT(5)
+#define BIT_MDT_XMIT_CTRL_FIXED_AID		BIT(4)
+#define BIT_MDT_XMIT_CTRL_SINGLE_RUN_EN		BIT(3)
+#define BIT_MDT_XMIT_CTRL_CLR_ABORT_WAIT	BIT(2)
+#define BIT_MDT_XMIT_CTRL_XFIFO_CLR_ALL		BIT(1)
+#define BIT_MDT_XMIT_CTRL_XFIFO_CLR_CUR		BIT(0)
 
 /* MDT Receive WRITE Port, default value: 0x00 */
 #define REG_MDT_XMIT_WRITE_PORT			0x0589