drm: bridge: dw_hdmi: default enable workaround to clear the overflow

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 <Sandor.yu@nxp.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/561951005a85574dcdd108e5d6a3a87df930ea3d.1649989179.git.Sandor.yu@nxp.com

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index a563460f8d209ee60f699321633b7a15091161e0..c11782fc15016fd05fc510c8fdc396626b9ddcee 100644 (file)
--- 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 */