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Subject[PATCH v7 01/15] drm/i915/gsc: skip irq initialization if using polling
Date
From: Vitaly Lubart <vitaly.lubart@intel.com>

Some platforms require the host to poll on the
GSC registers instead of relaying on the interrupts.
For those platforms, irq initialization should be skipped

Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
---
drivers/gpu/drm/i915/gt/intel_gsc.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gsc.c b/drivers/gpu/drm/i915/gt/intel_gsc.c
index 0e494028b81d..e0236ff1d072 100644
--- a/drivers/gpu/drm/i915/gt/intel_gsc.c
+++ b/drivers/gpu/drm/i915/gt/intel_gsc.c
@@ -40,6 +40,7 @@ struct gsc_def {
const char *name;
unsigned long bar;
size_t bar_size;
+ bool use_polling;
};

/* gsc resources and definitions (HECI1 and HECI2) */
@@ -117,6 +118,10 @@ static void gsc_init_one(struct drm_i915_private *i915,
return;
}

+ /* skip irq initialization */
+ if (def->use_polling)
+ goto add_device;
+
intf->irq = irq_alloc_desc(0);
if (intf->irq < 0) {
drm_err(&i915->drm, "gsc irq error %d\n", intf->irq);
@@ -129,6 +134,7 @@ static void gsc_init_one(struct drm_i915_private *i915,
goto fail;
}

+add_device:
adev = kzalloc(sizeof(*adev), GFP_KERNEL);
if (!adev)
goto fail;
@@ -182,10 +188,8 @@ static void gsc_irq_handler(struct intel_gt *gt, unsigned int intf_id)
return;
}

- if (gt->gsc.intf[intf_id].irq < 0) {
- drm_err_ratelimited(&gt->i915->drm, "GSC irq: irq not set");
+ if (gt->gsc.intf[intf_id].irq < 0)
return;
- }

ret = generic_handle_irq(gt->gsc.intf[intf_id].irq);
if (ret)
--
2.37.1
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