From e4142e7b46460997f9a5ad92a4568a59a884c457 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Fri, 14 Jun 2024 01:30:45 +0000
Subject: [PATCH] unstub probe_gmdid_display()

There is a temporary mapping of the first pci bar as this occurs before
the runtime info is setup and a generation specific bar is mapped based
on that.
---
 .../drm/i915/display/intel_display_device.c   | 22 +++++++++++++++----
 sys/dev/pci/drm/i915/i915_driver.c            |  1 +
 sys/dev/pci/drm/i915/i915_drv.h               |  1 +
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/sys/dev/pci/drm/i915/display/intel_display_device.c b/sys/dev/pci/drm/i915/display/intel_display_device.c
index 7a95caebe08..ab71ad64460 100644
--- a/sys/dev/pci/drm/i915/display/intel_display_device.c
+++ b/sys/dev/pci/drm/i915/display/intel_display_device.c
@@ -812,6 +812,10 @@ probe_gmdid_display(struct drm_i915_private *i915, u16 *ver, u16 *rel, u16 *step
 	void __iomem *addr;
 	u32 val;
 	int i;
+	int mmio_bar, mmio_size, mmio_type;
+	bus_space_tag_t bst;
+	bus_space_handle_t bsh;
+	bus_size_t memsize;
 
 	/* The caller expects to ver, rel and step to be initialized
 	 * here, and there's no good way to check when there was a
@@ -822,9 +826,7 @@ probe_gmdid_display(struct drm_i915_private *i915, u16 *ver, u16 *rel, u16 *step
 	*rel = 0;
 	*step = 0;
 
-	STUB();
-	return &no_display;
-#ifdef notyet
+#ifdef __linux__
 	addr = pci_iomap_range(pdev, 0, i915_mmio_reg_offset(GMD_ID_DISPLAY), sizeof(u32));
 	if (!addr) {
 		drm_err(&i915->drm, "Cannot map MMIO BAR to read display GMD_ID\n");
@@ -833,6 +835,19 @@ probe_gmdid_display(struct drm_i915_private *i915, u16 *ver, u16 *rel, u16 *step
 
 	val = ioread32(addr);
 	pci_iounmap(pdev, addr);
+#else
+	mmio_bar = 0x10;
+	mmio_type = pci_mapreg_type(i915->pc, i915->tag, mmio_bar);
+	if (pci_mapreg_map(i915->pa, mmio_bar, mmio_type, 0,
+	    &bst, &bsh, NULL, &memsize, 0)) {
+		drm_err(&i915->drm, "Cannot map MMIO BAR to read display GMD_ID\n");
+		return &no_display;
+	}
+
+	val = bus_space_read_4(bst, bsh, i915_mmio_reg_offset(GMD_ID_DISPLAY));
+
+	bus_space_unmap(bst, bsh, memsize);
+#endif
 
 	if (val == 0) {
 		drm_dbg_kms(&i915->drm, "Device doesn't have display\n");
@@ -851,7 +866,6 @@ probe_gmdid_display(struct drm_i915_private *i915, u16 *ver, u16 *rel, u16 *step
 	drm_err(&i915->drm, "Unrecognized display IP version %d.%02d; disabling display.\n",
 		*ver, *rel);
 	return &no_display;
-#endif
 }
 
 const struct intel_display_device_info *
diff --git a/sys/dev/pci/drm/i915/i915_driver.c b/sys/dev/pci/drm/i915/i915_driver.c
index 6d64c129114..8ba7b3f12fb 100644
--- a/sys/dev/pci/drm/i915/i915_driver.c
+++ b/sys/dev/pci/drm/i915/i915_driver.c
@@ -2258,6 +2258,7 @@ inteldrm_attach(struct device *parent, struct device *self, void *aux)
 	int mmio_bar, mmio_size, mmio_type;
 	int ret;
 
+	dev_priv->pa = pa;
 	dev_priv->pc = pa->pa_pc;
 	dev_priv->tag = pa->pa_tag;
 	dev_priv->iot = pa->pa_iot;
diff --git a/sys/dev/pci/drm/i915/i915_drv.h b/sys/dev/pci/drm/i915/i915_drv.h
index 577617eadb6..673a0164f7d 100644
--- a/sys/dev/pci/drm/i915/i915_drv.h
+++ b/sys/dev/pci/drm/i915/i915_drv.h
@@ -239,6 +239,7 @@ struct inteldrm_softc {
 	struct i915_dsm dsm;
 
 #ifdef __OpenBSD__
+	struct pci_attach_args *pa;
 	pci_chipset_tag_t pc;
 	pcitag_t tag;
 	struct extent *memex;
-- 
2.20.1