[RFC PATCH 119/162] drm/i915/dg1: Read OPROM via SPI controller

[Matthew Auld]

From: Clint Taylor <clinton.a.taylor at intel.com>

Read OPROM SPI through MMIO and find VBT entry since we can't use
OpRegion and PCI mapping may not work on some systems due to the BIOS
not leaving the Option ROM mapped.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Tomas Winkler <tomas.winkler at intel.com>
Cc: Jon Bloomfield <jon.bloomfield at intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 80 +++++++++++++++++++++--
 drivers/gpu/drm/i915/i915_reg.h           |  8 +++
 2 files changed, 82 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 4cc949b228f2..91044fc52acb 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2086,6 +2086,66 @@ bool intel_bios_is_valid_vbt(const void *buf, size_t size)
 	return vbt;
 }
 
+static struct vbt_header *spi_oprom_get_vbt(struct drm_i915_private *dev_priv)
+{
+	u32 count, data, found, store = 0;
+	u32 static_region, oprom_offset;
+	u32 oprom_size = 0x200000;
+	u16 vbt_size;
+	u32 *vbt;
+
+	static_region = I915_READ(SPI_STATIC_REGIONS);
+	static_region &= OPTIONROM_SPI_REGIONID_MASK;
+	I915_WRITE(PRIMARY_SPI_REGIONID, static_region);
+
+	oprom_offset = I915_READ(OROM_OFFSET);
+	oprom_offset &= OROM_OFFSET_MASK;
+
+	for (count = 0; count < oprom_size; count += 4) {
+		I915_WRITE(PRIMARY_SPI_ADDRESS, oprom_offset + count);
+		data = I915_READ(PRIMARY_SPI_TRIGGER);
+
+		if (data == *((const u32 *)"$VBT")) {
+			found = oprom_offset + count;
+			break;
+		}
+	}
+
+	if (count >= oprom_size)
+		goto err_not_found;
+
+	/* Get VBT size and allocate space for the VBT */
+	I915_WRITE(PRIMARY_SPI_ADDRESS, found +
+		   offsetof(struct vbt_header, vbt_size));
+	vbt_size = I915_READ(PRIMARY_SPI_TRIGGER);
+	vbt_size &= 0xffff;
+
+	vbt = kzalloc(vbt_size, GFP_KERNEL);
+	if (!vbt) {
+		DRM_ERROR("Unable to allocate %u bytes for VBT storage\n",
+			  vbt_size);
+		goto err_not_found;
+	}
+
+	for (count = 0; count < vbt_size; count += 4) {
+		I915_WRITE(PRIMARY_SPI_ADDRESS, found + count);
+		data = I915_READ(PRIMARY_SPI_TRIGGER);
+		*(vbt + store++) = data;
+	}
+
+	if (!intel_bios_is_valid_vbt(vbt, vbt_size))
+		goto err_free_vbt;
+
+	DRM_DEBUG_KMS("Found valid VBT in SPI flash\n");
+
+	return (struct vbt_header *)vbt;
+
+err_free_vbt:
+	kfree(vbt);
+err_not_found:
+	return NULL;
+}
+
 static struct vbt_header *oprom_get_vbt(struct drm_i915_private *dev_priv)
 {
 	struct pci_dev *pdev = dev_priv->drm.pdev;
@@ -2135,6 +2195,8 @@ static struct vbt_header *oprom_get_vbt(struct drm_i915_private *dev_priv)
 
 	pci_unmap_rom(pdev, oprom);
 
+	DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
+
 	return vbt;
 
 err_free_vbt:
@@ -2169,17 +2231,23 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
 
 	init_vbt_defaults(dev_priv);
 
-	/* If the OpRegion does not have VBT, look in PCI ROM. */
+	/*
+	 * If the OpRegion does not have VBT, look in SPI flash through MMIO or
+	 * PCI mapping
+	 */
+	if (!vbt && IS_DGFX(dev_priv)) {
+		oprom_vbt = spi_oprom_get_vbt(dev_priv);
+		vbt = oprom_vbt;
+	}
+
 	if (!vbt) {
 		oprom_vbt = oprom_get_vbt(dev_priv);
-		if (!oprom_vbt)
-			goto out;
-
 		vbt = oprom_vbt;
-
-		drm_dbg_kms(&dev_priv->drm, "Found valid VBT in PCI ROM\n");
 	}
 
+	if (!vbt)
+		goto out;
+
 	bdb = get_bdb_header(vbt);
 
 	drm_dbg_kms(&dev_priv->drm,
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3c8350f108e4..f00289574ac8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12413,6 +12413,14 @@ enum skl_power_gate {
 #define   DP_PIN_ASSIGNMENT_MASK(idx)		(0xf << ((idx) * 4))
 #define   DP_PIN_ASSIGNMENT(idx, x)		((x) << ((idx) * 4))
 
+#define PRIMARY_SPI_TRIGGER			_MMIO(0x102040)
+#define PRIMARY_SPI_ADDRESS			_MMIO(0x102080)
+#define PRIMARY_SPI_REGIONID			_MMIO(0x102084)
+#define SPI_STATIC_REGIONS			_MMIO(0x102090)
+#define   OPTIONROM_SPI_REGIONID_MASK		REG_GENMASK(7, 0)
+#define OROM_OFFSET				_MMIO(0x1020c0)
+#define   OROM_OFFSET_MASK			REG_GENMASK(20, 16)
+
 /* This register controls the Display State Buffer (DSB) engines. */
 #define _DSBSL_INSTANCE_BASE		0x70B00
 #define DSBSL_INSTANCE(pipe, id)	(_DSBSL_INSTANCE_BASE + \
-- 
2.26.2