[Intel-xe] [PATCH 5/5] drm/i915/display: Handle GMD_ID identification in display code
Matt Roper
matthew.d.roper at intel.com
Thu May 18 03:18:04 UTC 2023
For platforms with GMD_ID support (i.e., everything MTL and beyond),
identification of the display IP present should be based on the contents
of the GMD_ID register rather than a PCI devid match.
Note that since GMD_ID readout requires access to the PCI BAR, a slight
change to the driver init sequence is needed --- pci_enable_device() is
now called before i915_driver_create().
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
.../drm/i915/display/intel_display_device.c | 64 +++++++++++++++++--
.../drm/i915/display/intel_display_device.h | 5 +-
drivers/gpu/drm/i915/i915_driver.c | 10 +--
drivers/gpu/drm/i915/intel_device_info.c | 13 ++--
4 files changed, 78 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 78fa522aaf0b..813a2a494082 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -6,7 +6,10 @@
#include <drm/i915_pciids.h>
#include <drm/drm_color_mgmt.h>
#include <linux/mod_devicetable.h>
+#include <linux/pci.h>
+#include "i915_drv.h"
+#include "i915_reg.h"
#include "intel_display_device.h"
#include "intel_display_power.h"
#include "intel_display_reg_defs.h"
@@ -674,18 +677,69 @@ static const struct pci_device_id intel_display_ids[] = {
INTEL_RPLP_IDS(&xe_lpd_display),
INTEL_DG2_IDS(&xe_hpd_display),
- /* FIXME: Replace this with a GMD_ID lookup */
- INTEL_MTL_IDS(&xe_lpdp_display),
+ /*
+ * Do not add any GMD_ID-based platforms to this list. They will
+ * be probed automatically based on the IP version reported by
+ * the hardware.
+ */
};
+struct {
+ u16 ver;
+ u16 rel;
+ const struct intel_display_device_info *display;
+} gmdid_display_map[] = {
+ { 14, 0, &xe_lpdp_display },
+};
+
+static const struct intel_display_device_info *
+probe_gmdid_display(struct drm_i915_private *i915, u16 *ver, u16 *rel, u16 *step)
+{
+ struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+ void __iomem *addr;
+ u32 val;
+ int i;
+
+ 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");
+ return NULL;
+ }
+
+ val = ioread32(addr);
+ pci_iounmap(pdev, addr);
+
+ if (val == 0)
+ /* Platform doesn't have display */
+ return NULL;
+
+ *ver = REG_FIELD_GET(GMD_ID_ARCH_MASK, val);
+ *rel = REG_FIELD_GET(GMD_ID_RELEASE_MASK, val);
+ *step = REG_FIELD_GET(GMD_ID_STEP, val);
+
+ for (i = 0; i < ARRAY_SIZE(gmdid_display_map); i++)
+ if (*ver == gmdid_display_map[i].ver &&
+ *rel == gmdid_display_map[i].rel)
+ return gmdid_display_map[i].display;
+
+ drm_err(&i915->drm, "Unrecognized display IP version %d.%02d; disabling display.\n",
+ *ver, *rel);
+ return NULL;
+}
+
const struct intel_display_device_info *
-intel_display_device_probe(u16 pci_devid)
+intel_display_device_probe(struct drm_i915_private *i915, bool has_gmdid,
+ u16 *gmdid_ver, u16 *gmdid_rel, u16 *gmdid_step)
{
+ struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
int i;
+ if (has_gmdid)
+ return probe_gmdid_display(i915, gmdid_ver, gmdid_rel, gmdid_step);
+
for (i = 0; i < ARRAY_SIZE(intel_display_ids); i++) {
- if (intel_display_ids[i].device == pci_devid)
- return (struct intel_display_device_info *)intel_display_ids[i].driver_data;
+ if (intel_display_ids[i].device == pdev->device)
+ return (const struct intel_display_device_info *)intel_display_ids[i].driver_data;
}
return NULL;
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
index 0a60ebfaff80..9a344ee36d8c 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -80,7 +80,10 @@ struct intel_display_device_info {
} color;
};
+struct drm_i915_private;
+
const struct intel_display_device_info *
-intel_display_device_probe(u16 pci_devid);
+intel_display_device_probe(struct drm_i915_private *i915, bool has_gmdid,
+ u16 *ver, u16 *rel, u16 *step);
#endif
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 522733a89946..d02c602e9a0b 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -754,14 +754,16 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
struct drm_i915_private *i915;
int ret;
- i915 = i915_driver_create(pdev, ent);
- if (IS_ERR(i915))
- return PTR_ERR(i915);
-
ret = pci_enable_device(pdev);
if (ret)
goto out_fini;
+ i915 = i915_driver_create(pdev, ent);
+ if (IS_ERR(i915)) {
+ ret = PTR_ERR(i915);
+ goto out_pci_disable;
+ }
+
ret = i915_driver_early_probe(i915);
if (ret < 0)
goto out_pci_disable;
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 9d0b54ba50c1..5f38ff8caac0 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -345,7 +345,6 @@ static void ip_ver_read(struct drm_i915_private *i915, u32 offset, struct intel_
static void intel_ipver_early_init(struct drm_i915_private *i915)
{
struct intel_runtime_info *runtime = RUNTIME_INFO(i915);
- struct intel_display_runtime_info *display_runtime = DISPLAY_RUNTIME_INFO(i915);
if (!HAS_GMD_ID(i915)) {
drm_WARN_ON(&i915->drm, RUNTIME_INFO(i915)->graphics.ip.ver > 12);
@@ -366,8 +365,6 @@ static void intel_ipver_early_init(struct drm_i915_private *i915)
RUNTIME_INFO(i915)->graphics.ip.ver = 12;
RUNTIME_INFO(i915)->graphics.ip.rel = 70;
}
- ip_ver_read(i915, i915_mmio_reg_offset(GMD_ID_DISPLAY),
- (struct intel_ip_version *)&display_runtime->ip);
ip_ver_read(i915, i915_mmio_reg_offset(GMD_ID_MEDIA),
&runtime->media.ip);
}
@@ -575,6 +572,7 @@ void intel_device_info_driver_create(struct drm_i915_private *i915,
struct intel_device_info *info;
struct intel_runtime_info *runtime;
struct intel_display_runtime_info *display_runtime;
+ u16 ver, rel, step;
/* Setup the write-once "constant" device info */
info = mkwrite_device_info(i915);
@@ -585,11 +583,18 @@ void intel_device_info_driver_create(struct drm_i915_private *i915,
memcpy(runtime, &INTEL_INFO(i915)->__runtime, sizeof(*runtime));
/* Probe display support */
- info->display = intel_display_device_probe(device_id);
+ info->display = intel_display_device_probe(i915, info->has_gmd_id,
+ &ver, &rel, &step);
if (info->display) {
display_runtime = DISPLAY_RUNTIME_INFO(i915);
memcpy(display_runtime, &DISPLAY_INFO(i915)->__runtime,
sizeof(*display_runtime));
+
+ if (info->has_gmd_id) {
+ display_runtime->ip.ver = ver;
+ display_runtime->ip.rel = rel;
+ display_runtime->ip.step = step;
+ }
} else {
info->display = &no_display;
}
--
2.40.0
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