[Intel-xe] [PATCH 5/8] drm/i915/display: Handle GMD_ID identification in display code
Matt Roper
matthew.d.roper at intel.com
Wed May 31 22:48:18 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().
v2:
- Fix use of uninitialized i915 pointer in error path if
pci_enable_device() fails before the i915 device is created. (lkp)
- Use drm_device parameter to intel_display_device_probe. This goes
against i915 conventions, but since the primary goal here is to make
it easy to call this function from other drivers (like Xe) and since
we don't need anything from the i915 structure, this seems like an
exception where drm_device is a more natural fit.
v3:
- Go back do drm_i915_private for intel_display_device_probe. (Jani)
- Move forward decl to top of header. (Jani)
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230523195609.73627-6-matthew.d.roper@intel.com
(cherry picked from commit 12e6f6dc78e4f4a418648fb1a9c0cd2ae9b3430b)
---
.../drm/i915/display/intel_display_device.c | 65 +++++++++++++++++--
.../drm/i915/display/intel_display_device.h | 5 +-
drivers/gpu/drm/i915/i915_driver.c | 17 +++--
drivers/gpu/drm/i915/intel_device_info.c | 13 ++--
4 files changed, 84 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 3e2f4cd0b9f5..a513ac8f71a3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -5,7 +5,10 @@
#include <drm/i915_pciids.h>
#include <drm/drm_color_mgmt.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"
@@ -700,19 +703,73 @@ static const struct {
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.
+ */
};
+static const 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 &no_display;
+ }
+
+ val = ioread32(addr);
+ pci_iounmap(pdev, addr);
+
+ if (val == 0)
+ /* Platform doesn't have display */
+ return &no_display;
+
+ *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 &no_display;
+}
+
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].devid == pci_devid)
+ if (intel_display_ids[i].devid == pdev->device)
return intel_display_ids[i].info;
}
+ drm_dbg(&i915->drm, "No display ID found for device ID %04x; disabling display.\n",
+ pdev->device);
+
return &no_display;
}
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
index 1f7d08b3ad6b..d1d11581d85d 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -10,6 +10,8 @@
#include "display/intel_display_limits.h"
+struct drm_i915_private;
+
#define DEV_INFO_DISPLAY_FOR_EACH_FLAG(func) \
/* Keep in alphabetical order */ \
func(cursor_needs_physical); \
@@ -81,6 +83,7 @@ struct intel_display_device_info {
};
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 903a0a2e3635..27e5de529b06 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -754,13 +754,17 @@ 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;
+ if (ret) {
+ pr_err("Failed to enable graphics device: %pe\n", ERR_PTR(ret));
+ return ret;
+ }
+
+ 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)
@@ -843,7 +847,6 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
i915_driver_late_release(i915);
out_pci_disable:
pci_disable_device(pdev);
-out_fini:
i915_probe_error(i915, "Device initialization failed (%d)\n", ret);
return ret;
}
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 79523e55ca9c..2f79d232b04a 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);
}
@@ -574,6 +571,7 @@ void intel_device_info_driver_create(struct drm_i915_private *i915,
{
struct intel_device_info *info;
struct intel_runtime_info *runtime;
+ u16 ver, rel, step;
/* Setup the write-once "constant" device info */
info = mkwrite_device_info(i915);
@@ -584,11 +582,18 @@ 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);
memcpy(DISPLAY_RUNTIME_INFO(i915),
&DISPLAY_INFO(i915)->__runtime_defaults,
sizeof(*DISPLAY_RUNTIME_INFO(i915)));
+ if (info->has_gmd_id) {
+ DISPLAY_RUNTIME_INFO(i915)->ip.ver = ver;
+ DISPLAY_RUNTIME_INFO(i915)->ip.rel = rel;
+ DISPLAY_RUNTIME_INFO(i915)->ip.step = step;
+ }
+
runtime->device_id = device_id;
}
--
2.40.1
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