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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] [bisected] Freeze when booting with kernel 4.9 and later"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101049#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] [bisected] Freeze when booting with kernel 4.9 and later"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101049">bug 101049</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Correcting myself, there was one which was to act upon the result of:
if (IS_GEN6(dev_priv) ||
IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv)) {
u32 params = 0;
sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, ¶ms);
if (params & BIT(31)) { /* OC supported */
DRM_DEBUG_DRIVER("Overclocking supported, max: %dMHz,
overclock: %dMHz\n",
(dev_priv->rps.max_freq & 0xff) * 50,
(params & 0xff) * 50);
dev_priv->rps.max_freq = params & 0xff;
}
}
So to test that:
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 417fd72f6968..a5a5b90d7044 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7530,8 +7530,7 @@ void intel_init_gt_powersave(struct drm_i915_private
*dev_priv)
intel_freq_opcode(dev_priv, 450));
/* After setting max-softlimit, find the overclock max freq */
- if (IS_GEN6(dev_priv) ||
- IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv)) {
+ if (0) {
u32 params = 0;
sandybridge_pcode_read(dev_priv, GEN6_READ_OC_PARAMS, ¶ms);</pre>
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