On Saturday, August 30, 2014 05:48:38 PM John Baldwin wrote:
> Author: jhb
> Date: Sat Aug 30 17:48:38 2014
> New Revision: 270850
> URL: http://svnweb.freebsd.org/changeset/base/270850
>
> Log:
> Save and restore FPU state across suspend and resume. In earlier
> revisions of this patch, resumectx() called npxresume() directly, but that
> doesn't work because resumectx() runs with a non-standard %cs selector.
> Instead, all of the FPU suspend/resume handling is done in C.
This mostly fixes suspend and resume in X on a little 32-bit only netbook I
have. I needed an additional patch to the i915 code to prevent it from
tearing down its interrupt handler in suspend and re-establishing it during
resume (this sort of thing is not needed in drivers and isn't safe because
suspend runs pinned to CPU 0 and unregistering an interrupt needs to bind to
the CPU the IDT vector is assigned to).
--- //depot/vendor/freebsd/src/sys/dev/drm2/i915/i915_drv.c
+++ //depot/user/jhb/acpipci/dev/drm2/i915/i915_drv.c
@@ -253,7 +253,9 @@
"GEM idle failed, resume might fail\n");
return (error);
}
+#if 0
drm_irq_uninstall(dev);
+#endif
}
i915_save_state(dev);
@@ -315,7 +317,9 @@
sx_xlock(&dev->mode_config.mutex);
drm_mode_config_reset(dev);
sx_xunlock(&dev->mode_config.mutex);
+#if 0
drm_irq_install(dev);
+#endif
sx_xlock(&dev->mode_config.mutex);
/* Resume the modeset for every activated CRTC */
Even with that my one attempt at resuming in X so far seemed to hang in X
(though the machine was fine and worked fine aside from X hanging).
Curiously, this netbook is able to suspend/resume just fine on the console
with syscons(4), but the LCD is not turned back on if I suspend/resume with
vt(4) using the VGA driver. I think vt(4) should do some of the VESA stuff
for suspend/resume syscons does when using vt_vga (but not when using one of
the KMS backends).
--
John Baldwin
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