[src/trunk]: src/sys/external/bsd/drm2/dist/drm/i915 Implement vga twiddling.

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

details:   https://anonhg.NetBSD.org/src/rev/422e1c33ea67
branches:  trunk
changeset: 364457:422e1c33ea67
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 07:30:25 2018 +0000

description:
Implement vga twiddling.

diffstat:

 sys/external/bsd/drm2/dist/drm/i915/intel_runtime_pm.c |  39 ++++++++++++++---
 1 files changed, 31 insertions(+), 8 deletions(-)

diffs (74 lines):

diff -r f37c43f84aee -r 422e1c33ea67 sys/external/bsd/drm2/dist/drm/i915/intel_runtime_pm.c
--- a/sys/external/bsd/drm2/dist/drm/i915/intel_runtime_pm.c    Mon Aug 27 07:30:13 2018 +0000
+++ b/sys/external/bsd/drm2/dist/drm/i915/intel_runtime_pm.c    Mon Aug 27 07:30:25 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: intel_runtime_pm.c,v 1.3 2018/08/27 07:30:13 riastradh Exp $   */
+/*     $NetBSD: intel_runtime_pm.c,v 1.4 2018/08/27 07:30:25 riastradh Exp $   */
 
 /*
  * Copyright © 2012-2014 Intel Corporation
@@ -29,7 +29,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: intel_runtime_pm.c,v 1.3 2018/08/27 07:30:13 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: intel_runtime_pm.c,v 1.4 2018/08/27 07:30:25 riastradh Exp $");
 
 #include <linux/pm_runtime.h>
 #include <linux/vgaarb.h>
@@ -197,6 +197,33 @@
        dev_priv->power_domains.init_power_on = enable;
 }
 
+static inline void
+touch_vga_msr(struct drm_device *dev)
+{
+#ifdef __NetBSD__
+       const bus_addr_t vgabase = 0x3c0;
+       const bus_space_tag_t iot = dev->pdev->pd_pa.pa_iot;
+       bus_space_handle_t ioh;
+       uint8_t msr;
+       int error;
+
+       error = bus_space_map(iot, vgabase, 0x10, 0, &ioh);
+       if (error) {
+               device_printf(dev->pdev->pd_dev,
+                   "unable to map VGA registers: %d\n", error);
+       } else {
+               CTASSERT(vgabase <= VGA_MSR_READ);
+               msr = bus_space_read_1(iot, ioh, VGA_MSR_READ - vgabase);
+               bus_space_write_1(iot, ioh, VGA_MSR_READ - vgabase, msr);
+               bus_space_unmap(iot, ioh, 0x10);
+       }
+#else
+       vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
+       outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
+       vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
+#endif
+}
+
 /*
  * Starting with Haswell, we have a "Power Down Well" that can be turned off
  * when not needed anymore. We have 4 registers that can request the power well
@@ -217,9 +244,7 @@
         * sure vgacon can keep working normally without triggering interrupts
         * and error messages.
         */
-       vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
-       outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
-       vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
+       touch_vga_msr(dev);
 
        if (IS_BROADWELL(dev))
                gen8_irq_power_well_post_enable(dev_priv,
@@ -242,9 +267,7 @@
         * and error messages.
         */
        if (power_well->data == SKL_DISP_PW_2) {
-               vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
-               outb(inb(VGA_MSR_READ), VGA_MSR_WRITE);
-               vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
+               touch_vga_msr(dev);
 
                gen8_irq_power_well_post_enable(dev_priv,
                                                1 << PIPE_C | 1 << PIPE_B);