drm/bridge: it6505: Modified video clock calculation and video debug message

Speed up video clock calculation and remove redundant video debug message.
Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220715024910.12578-4-allen.chen@ite.com.tw

drivers/gpu/drm/bridge/ite-it6505.c

@@ -691,7 +691,7 @@ static void it6505_calc_video_info(struct it6505 *it6505)
 	DRM_DEV_DEBUG_DRIVER(dev, "hactive_start:%d, vactive_start:%d",
 			     hdes, vdes);
 
-	for (i = 0; i < 10; i++) {
+	for (i = 0; i < 3; i++) {
 		it6505_set_bits(it6505, REG_DATA_CTRL0, ENABLE_PCLK_COUNTER,
 				ENABLE_PCLK_COUNTER);
 		usleep_range(10000, 15000);
@@ -708,7 +708,7 @@ static void it6505_calc_video_info(struct it6505 *it6505)
 		return;
 	}
 
-	sum /= 10;
+	sum /= 3;
 	pclk = 13500 * 2048 / sum;
 	it6505->video_info.clock = pclk;
 	it6505->video_info.hdisplay = hdew;
@@ -2350,8 +2350,6 @@ static void it6505_irq_hpd(struct it6505 *it6505)
 
 		if (!it6505_get_video_status(it6505))
 			it6505_video_reset(it6505);
-
-		it6505_calc_video_info(it6505);
 	} else {
 		memset(it6505->dpcd, 0, sizeof(it6505->dpcd));