On Mon, Apr 12, 2021 at 10:05:20AM +0100, Matthew Auld wrote:
From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
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.
I was surprised to see we still don't have this patch applied. There is
some coding style to fix, but if we don't have it we are basically
relying on the fallback of using a fake/hardcoded vbt. I will do some
fixups and re-submit.
Lucas De Marchi
v2 by Jani:
- switch to intel_uncore_read/intel_uncore_write
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Cc: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
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 ea4837d485a1..f9dc651f1652 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2238,6 +2238,66 @@ 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 *i915)
+{
+ u32 count, data, found, store = 0;
+ u32 static_region, oprom_offset;
+ u32 oprom_size = 0x200000;
+ u16 vbt_size;
+ u32 *vbt;
+
+ static_region = intel_uncore_read(&i915->uncore, SPI_STATIC_REGIONS);
+ static_region &= OPTIONROM_SPI_REGIONID_MASK;
+ intel_uncore_write(&i915->uncore, PRIMARY_SPI_REGIONID, static_region);
+
+ oprom_offset = intel_uncore_read(&i915->uncore, OROM_OFFSET);
+ oprom_offset &= OROM_OFFSET_MASK;
+
+ for (count = 0; count < oprom_size; count += 4) {
+ intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, oprom_offset + count);
+ data = intel_uncore_read(&i915->uncore, 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 */
+ intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, found +
+ offsetof(struct vbt_header, vbt_size));
+ vbt_size = intel_uncore_read(&i915->uncore, 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) {
+ intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, found + count);
+ data = intel_uncore_read(&i915->uncore, 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 *i915)
{
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
@@ -2287,6 +2347,8 @@ static struct vbt_header *oprom_get_vbt(struct drm_i915_private *i915)
pci_unmap_rom(pdev, oprom);
+ DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
+
return vbt;
err_free_vbt:
@@ -2321,17 +2383,23 @@ void intel_bios_init(struct drm_i915_private *i915)
init_vbt_defaults(i915);
- /* 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(i915)) {
+ oprom_vbt = spi_oprom_get_vbt(i915);
+ vbt = oprom_vbt;
+ }
+
if (!vbt) {
oprom_vbt = oprom_get_vbt(i915);
- if (!oprom_vbt)
- goto out;
-
vbt = oprom_vbt;
-
- drm_dbg_kms(&i915->drm, "Found valid VBT in PCI ROM\n");
}
+ if (!vbt)
+ goto out;
+
bdb = get_bdb_header(vbt);
i915->vbt.version = bdb->version;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index da73dc939e58..54ff63b86df6 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12540,6 +12540,14 @@ 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 + \
--
2.26.3
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