disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/media/v4l2-core/v4l2-dv-timings.c
..
..
@@ -145,6 +145,8 @@
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 	const struct v4l2_bt_timings *bt = &t->bt;
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 	const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
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 	u32 caps = cap->capabilities;
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+	const u32 max_vert = 10240;
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+	u32 max_hor = 3 * bt->width;
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 	if (t->type != V4L2_DV_BT_656_1120)
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 		return false;
..
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@@ -160,6 +162,26 @@
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 	     !(bt->standards & cap->standards)) ||
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 	    (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
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 	    (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
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+		return false;
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+
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+	/* sanity checks for the blanking timings */
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+	if (!bt->interlaced &&
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+	    (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
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+		return false;
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+	/*
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+	 * Some video receivers cannot properly separate the frontporch,
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+	 * backporch and sync values, and instead they only have the total
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+	 * blanking. That can be assigned to any of these three fields.
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+	 * So just check that none of these are way out of range.
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+	 */
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+	if (bt->hfrontporch > max_hor ||
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+	    bt->hsync > max_hor || bt->hbackporch > max_hor)
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+		return false;
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+	if (bt->vfrontporch > max_vert ||
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+	    bt->vsync > max_vert || bt->vbackporch > max_vert)
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+		return false;
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+	if (bt->interlaced && (bt->il_vfrontporch > max_vert ||
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+	    bt->il_vsync > max_vert || bt->il_vbackporch > max_vert))
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 		return false;
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 	return fnc == NULL || fnc(t, fnc_handle);
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 }
..
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@@ -293,7 +315,7 @@
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 	if (prefix == NULL)
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 		prefix = "";
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-	pr_info("%s: %s%ux%u%s%u.%u (%ux%u)\n", dev_prefix, prefix,
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+	pr_info("%s: %s%ux%u%s%u.%02u (%ux%u)\n", dev_prefix, prefix,
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 		bt->width, bt->height, bt->interlaced ? "i" : "p",
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 		fps / 100, fps % 100, htot, vtot);
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321
 
..
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@@ -373,6 +395,45 @@
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 	return ratio;
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 }
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 EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
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+
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+/** v4l2_calc_timeperframe - helper function to calculate timeperframe based
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+ *	v4l2_dv_timings fields.
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+ * @t - Timings for the video mode.
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+ *
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+ * Calculates the expected timeperframe using the pixel clock value and
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+ * horizontal/vertical measures. This means that v4l2_dv_timings structure
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+ * must be correctly and fully filled.
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+ */
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+struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
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+{
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+	const struct v4l2_bt_timings *bt = &t->bt;
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+	struct v4l2_fract fps_fract = { 1, 1 };
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+	unsigned long n, d;
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+	u32 htot, vtot, fps;
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+	u64 pclk;
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+
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+	if (t->type != V4L2_DV_BT_656_1120)
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+		return fps_fract;
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+
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+	htot = V4L2_DV_BT_FRAME_WIDTH(bt);
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+	vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
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+	pclk = bt->pixelclock;
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+
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+	if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
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+	    (bt->flags & V4L2_DV_FL_REDUCED_FPS))
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+		pclk = div_u64(pclk * 1000ULL, 1001);
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+
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+	fps = (htot * vtot) > 0 ? div_u64((100 * pclk), (htot * vtot)) : 0;
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+	if (!fps)
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+		return fps_fract;
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+
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+	rational_best_approximation(fps, 100, fps, 100, &n, &d);
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+
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+	fps_fract.numerator = d;
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+	fps_fract.denominator = n;
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+	return fps_fract;
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+}
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+EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
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 /*
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  * CVT defines
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@@ -718,7 +779,7 @@
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 	pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
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 	hsync = (frame_width * 8 + 50) / 100;
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-	hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN;
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+	hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
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 	h_fp = h_blank / 2 - hsync;
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