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#define CHECK(e,l,h) (var->e < l || var->e > h)
	if (CHECK(right_margin, (5+1), 256) ||	/* back porch */
	    CHECK(left_margin, (5+1), 256) ||	/* front porch */
	    CHECK(hsync_len, (5+1), 256) ||
	    var->xres > 4096 ||

These 4 checks don't match the actual values that can be
generated by the CLCD controller. The minimum values for left
and right horizontal porch and HSYNC width can go down to
1 clock.

The maximum x resolution for the pl11x devices is 1024 pixels.

I know this function can be overridden for platforms using the
clcd driver, but does anyone have any problem making this
function match the hardware?

thanks,
Kevin