[src/trunk]: src/sys/arch/arm/sunxi Fix start_delay calculation for tcon0. po...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/be824fe87b43
branches:  trunk
changeset: 962222:be824fe87b43
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jul 06 00:23:38 2019 +0000

description:
Fix start_delay calculation for tcon0. port-arm/54342

diffstat:

 sys/arch/arm/sunxi/sunxi_lcdc.c |  10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diffs (31 lines):

diff -r e0a20c944b0c -r be824fe87b43 sys/arch/arm/sunxi/sunxi_lcdc.c
--- a/sys/arch/arm/sunxi/sunxi_lcdc.c   Sat Jul 06 00:10:25 2019 +0000
+++ b/sys/arch/arm/sunxi/sunxi_lcdc.c   Sat Jul 06 00:23:38 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: sunxi_lcdc.c,v 1.5 2019/02/18 02:42:27 jakllsch Exp $ */
+/* $NetBSD: sunxi_lcdc.c,v 1.6 2019/07/06 00:23:38 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2019 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sunxi_lcdc.c,v 1.5 2019/02/18 02:42:27 jakllsch Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sunxi_lcdc.c,v 1.6 2019/07/06 00:23:38 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -219,10 +219,8 @@
        const u_int hbp = mode->htotal - mode->hsync_start;
        const u_int vspw = mode->vsync_end - mode->vsync_start;
        const u_int vbp = mode->vtotal - mode->vsync_start;
-       const u_int vblank_len =
-           ((mode->vtotal << interlace_p) >> 1) - mode->vdisplay - 2;
-       const u_int start_delay =
-           vblank_len >= 32 ? 30 : vblank_len - 2;
+       const u_int vblank_len = (mode->vtotal - mode->vdisplay) >> interlace_p;
+       const u_int start_delay = uimin(vblank_len, 30);
 
        val = TCON0_CTL_TCON0_EN |
              __SHIFTIN(start_delay, TCON0_CTL_START_DELAY);