From 2e9a91a4dd8866814f7f9859761c70224cb8e004 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Thu, 1 Sep 2022 15:11:47 +0000
Subject: [PATCH] drmfb: Rework console detection and takeover.
---
sys/external/bsd/drm2/drm/drmfb.c | 67 +++++++++++++------------------
1 file changed, 27 insertions(+), 40 deletions(-)
diff --git a/sys/external/bsd/drm2/drm/drmfb.c b/sys/external/bsd/drm2/drm/drmfb.c
index b3887f10902c..1b0a6c3d460e 100644
--- a/sys/external/bsd/drm2/drm/drmfb.c
+++ b/sys/external/bsd/drm2/drm/drmfb.c
@@ -94,9 +94,8 @@ drmfb_attach(struct drmfb_softc *sc, const struct drmfb_attach_args *da)
#endif
static const struct genfb_ops zero_genfb_ops;
struct genfb_ops genfb_ops = zero_genfb_ops;
- enum { CONS_VGA, CONS_GENFB, CONS_NONE } what_was_cons;
bool is_console;
- int error;
+ int error __diagused;
/* genfb requires this. */
KASSERTMSG((void *)&sc->sc_genfb == device_private(da->da_dev),
@@ -116,29 +115,35 @@ drmfb_attach(struct drmfb_softc *sc, const struct drmfb_attach_args *da)
prop_dictionary_set_uint64(dict, "mode_callback",
(uint64_t)(uintptr_t)&drmfb_genfb_mode_callback);
+ /*
+ * Determine whether MD firmware logic has set the console to
+ * go through this device.
+ */
if (prop_dictionary_get_bool(pdict, "is_console", &is_console)) {
- what_was_cons = CONS_NONE;
- prop_dictionary_set_bool(dict, "is_console", is_console);
+ /* nothing */
+ } else if (genfb_is_console() && genfb_is_enabled()) {
+ is_console = true;
} else {
- /* XXX Whattakludge! */
+ is_console = false;
+ }
+
#if NVGA > 0
- if ((da->da_params->dp_is_vga_console != NULL) &&
- (*da->da_params->dp_is_vga_console)(dev)) {
- what_was_cons = CONS_VGA;
- prop_dictionary_set_bool(dict, "is_console", true);
- vga_cndetach();
- if (da->da_params->dp_disable_vga)
- (*da->da_params->dp_disable_vga)(dev);
- } else
-#endif
- if (genfb_is_console() && genfb_is_enabled()) {
- what_was_cons = CONS_GENFB;
- prop_dictionary_set_bool(dict, "is_console", true);
- } else {
- what_was_cons = CONS_NONE;
- prop_dictionary_set_bool(dict, "is_console", false);
- }
+ /*
+ * Whether or not we were told to be the console, if the
+ * console was configured to go through a vga resource that we
+ * now own and that vga(4) is not going to take over, kick out
+ * the vga console before we take over as genfb console.
+ */
+ if ((da->da_params->dp_is_vga_console != NULL) &&
+ (*da->da_params->dp_is_vga_console)(dev)) {
+ vga_cndetach();
+ if (da->da_params->dp_disable_vga)
+ (*da->da_params->dp_disable_vga)(dev);
+ is_console = true;
}
+#endif
+
+ prop_dictionary_set_bool(dict, "is_console", is_console);
/* Make the first EDID we find available to wsfb */
drm_connector_list_iter_begin(da->da_fb_helper->dev, &conn_iter);
@@ -162,28 +167,10 @@ drmfb_attach(struct drmfb_softc *sc, const struct drmfb_attach_args *da)
KERNEL_LOCK(1, NULL);
error = genfb_attach(&sc->sc_genfb, &genfb_ops);
KERNEL_UNLOCK_ONE(NULL);
- if (error) {
- aprint_error_dev(sc->sc_da.da_dev,
- "failed to attach genfb: %d\n", error);
- goto fail0;
- }
+ KASSERTMSG(error == 0, "genfb_attach failed, error=%d", error);
/* Success! */
return 0;
-
-fail0: KASSERT(error);
- /* XXX Restore console... */
- switch (what_was_cons) {
- case CONS_VGA:
- break;
- case CONS_GENFB:
- break;
- case CONS_NONE:
- break;
- default:
- break;
- }
- return error;
}
int