Wed May 1 08:58:34 2024 UTC (32d)

Add DELAY(9) to make palette register settings stable on 98543 in HP360.

Note 98547 (6 bpp variant) on HP370 (68030 33MHz) doesn't need these
DELAYs so maybe only some old variants (98543 and 98545?) on 020/030
have such restriction (actually only one nop seems enough.)


(tsutsui)

diff -r1.9 -r1.10 src/sys/arch/hp300/dev/topcat.c

--- src/sys/arch/hp300/dev/topcat.c 2024/04/29 17:47:27	1.9
+++ src/sys/arch/hp300/dev/topcat.c 2024/05/01 08:58:34	1.10

 @@ -1,14 +1,14 @@
-/*	$NetBSD: topcat.c,v 1.9 2024/04/29 17:47:27 tsutsui Exp $	*/
+/*	$NetBSD: topcat.c,v 1.10 2024/05/01 08:58:34 tsutsui Exp $	*/
 /*	$OpenBSD: topcat.c,v 1.15 2006/08/11 18:33:13 miod Exp $	*/
 /*
  * Copyright (c) 2005, Miodrag Vallat.
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
 @@ -464,27 +464,29 @@ topcat_setcolor(struct diofb *fb, u_int
 		tc->bdata  = fb->cmap.b[index];
 		tc->strobe = 0xff;
 		/* XXX delay required on 68020/30 to avoid bus error */
 		DELAY(100);
 		tccm_waitbusy(tc);
 		tc->cindex = 0;
 	} else {
 		tccm_waitbusy(tc);
 		tc->plane_mask = fb->planemask;
 		tc->rdata  = fb->cmap.r[index];
 		tc->gdata  = fb->cmap.g[index];
 		tc->bdata  = fb->cmap.b[index];
 		DELAY(1);	/* necessary for at least old HP98543 */
 		tc->cindex = ~index;
 		DELAY(1);	/* necessary for at least old HP98543 */
 		tc->strobe = 0xff;
 		/* XXX delay required on 68020/30 to avoid bus error */
 		DELAY(100);
 		tccm_waitbusy(tc);
 		tc->rdata  = 0;
 		tc->gdata  = 0;
 		tc->bdata  = 0;
 		tc->cindex = 0;
+	}
+}
 int