[src/trunk]: src/sys/arch/sgimips/dev Add support for overriding the video mo...

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

details:   https://anonhg.NetBSD.org/src/rev/b14e2350e87a
branches:  trunk
changeset: 831241:b14e2350e87a
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Mar 17 13:14:27 2018 +0000

description:
Add support for overriding the video mode by setting an ARCS environment
variable.

If the "crmfb_mode" environment variable is set, treat it as a mode
string in the form WIDTHxHEIGHT[@REFRESH] and generate monitor timings
using the VESA GTF formula. If set, this overrides the EDID preferred
mode.

diffstat:

 sys/arch/sgimips/dev/crmfb.c |  54 ++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 47 insertions(+), 7 deletions(-)

diffs (100 lines):

diff -r a6ab91ede845 -r b14e2350e87a sys/arch/sgimips/dev/crmfb.c
--- a/sys/arch/sgimips/dev/crmfb.c      Sat Mar 17 11:07:26 2018 +0000
+++ b/sys/arch/sgimips/dev/crmfb.c      Sat Mar 17 13:14:27 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: crmfb.c,v 1.44 2017/05/19 19:25:53 macallan Exp $ */
+/* $NetBSD: crmfb.c,v 1.45 2018/03/17 13:14:27 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2007 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: crmfb.c,v 1.44 2017/05/19 19:25:53 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: crmfb.c,v 1.45 2018/03/17 13:14:27 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -57,6 +57,7 @@
 #include <dev/i2c/i2c_bitbang.h>
 #include <dev/i2c/ddcvar.h>
 #include <dev/videomode/videomode.h>
+#include <dev/videomode/vesagtf.h>
 #include <dev/videomode/edidvar.h>
 
 #include <arch/sgimips/dev/crmfbreg.h>
@@ -232,6 +233,7 @@
 /* mode setting stuff */
 static uint32_t calc_pll(int); /* frequency in kHz */
 static int crmfb_set_mode(struct crmfb_softc *, const struct videomode *);
+static int crmfb_parse_mode(const char *, struct videomode *);
 
 CFATTACH_DECL_NEW(crmfb, sizeof(struct crmfb_softc),
     crmfb_match, crmfb_attach, NULL, NULL);
@@ -254,6 +256,8 @@
        unsigned long v;
        long defattr;
        const char *consdev;
+       const char *modestr;
+       struct videomode mode, *pmode;
        int rv, i;
 
        sc = device_private(self);
@@ -305,11 +309,16 @@
        sc->sc_console_depth = 8;
 
        crmfb_setup_ddc(sc);
-       if ((sc->sc_edid_info.edid_preferred_mode != NULL)) {
-               if (crmfb_set_mode(sc, sc->sc_edid_info.edid_preferred_mode))
-                       aprint_normal_dev(sc->sc_dev, "using %dx%d\n",
-                           sc->sc_width, sc->sc_height);
-       }
+       pmode = sc->sc_edid_info.edid_preferred_mode;
+
+       modestr = arcbios_GetEnvironmentVariable("crmfb_mode");
+       if (crmfb_parse_mode(modestr, &mode) == 0)
+               pmode = &mode;
+
+       if (pmode != NULL && crmfb_set_mode(sc, pmode))
+               aprint_normal_dev(sc->sc_dev, "using %dx%d\n",
+                   sc->sc_width, sc->sc_height);
+
        /*
         * first determine how many tiles we need
         * in 32bit each tile is 128x128 pixels
@@ -1859,3 +1868,34 @@
 
        return TRUE;
 }
+
+/*
+ * Parse a mode string in the form WIDTHxHEIGHT[@REFRESH] and return
+ * monitor timings generated using the VESA GTF formula.
+ */
+static int
+crmfb_parse_mode(const char *modestr, struct videomode *mode)
+{
+       char *x, *at;
+       int width, height, refresh;
+
+       if (modestr == NULL)
+               return EINVAL;
+
+       x = strchr(modestr, 'x');
+       at = strchr(modestr, '@');
+
+       if (x == NULL || (at != NULL && at < x))
+               return EINVAL;
+
+       width = strtoul(modestr, NULL, 10);
+       height = strtoul(x + 1, NULL, 10);
+       refresh = at ? strtoul(at + 1, NULL, 10) : 60;
+
+       if (width == 0 || height == 0 || refresh == 0)
+               return EINVAL;
+
+       vesagtf_mode(width, height, refresh, mode);
+
+       return 0;
+}