[v3,1/4] drm: bridge: dw_hdmi: default enable workaround to clear the overflow

Commit Message

Sandor Yu April 15, 2022, 2:42 a.m. UTC

From: Sandor Yu <[e-mail]>

i.MX8MPlus (v2.13a) has verified need the workaround to clear the
overflow with one iteration.
Only i.MX6Q(v1.30a) need the workaround with 4 iterations,
the others versions later than v1.3a have been identified as needing
the workaround with a single iteration.

Default enable the workaround with one iteration for all versions
later than v1.30a.

Signed-off-by: Sandor Yu <[e-mail]>
Acked-by: Neil Armstrong <[e-mail]>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

Patch

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4befc104d220..02d8f7e08814 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2086,30 +2086,21 @@  static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	 * then write one of the FC registers several times.
 	 *
 	 * The number of iterations matters and depends on the HDMI TX revision
-	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
-	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
-	 * as needing the workaround, with 4 iterations for v1.30a and 1
-	 * iteration for others.
-	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
-	 * the workaround with a single iteration.
-	 * The Rockchip RK3288 SoC (v2.00a) and RK3328/RK3399 SoCs (v2.11a) have
-	 * been identified as needing the workaround with a single iteration.
+	 * (and possibly on the platform).
+	 * 4 iterations for i.MX6Q(v1.30a) and 1 iteration for others.
+	 * i.MX6DL (v1.31a), Allwinner SoCs (v1.32a), Rockchip RK3288 SoC (v2.00a),
+	 * Amlogic Meson GX SoCs (v2.01a), RK3328/RK3399 SoCs (v2.11a)
+	 * and i.MX8MPlus (v2.13a) have been identified as needing the workaround
+	 * with a single iteration.
 	 */
 
 	switch (hdmi->version) {
 	case 0x130a:
 		count = 4;
 		break;
-	case 0x131a:
-	case 0x132a:
-	case 0x200a:
-	case 0x201a:
-	case 0x211a:
-	case 0x212a:
+	default:
 		count = 1;
 		break;
-	default:
-		return;
 	}
 
 	/* TMDS software reset */