From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Shyti Subject: Re: [PATCH] drm/i915/tgl: Magic udelay to relieve the random lockups with multiple engines Date: Sun, 29 Sep 2019 23:25:54 +0300 Message-ID: <20190929202554.GF2902@intel.intel> References: <20190928100145.13165-1-chris@chris-wilson.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 75E826E332 for ; Sun, 29 Sep 2019 20:25:57 +0000 (UTC) Content-Disposition: inline In-Reply-To: <20190928100145.13165-1-chris@chris-wilson.co.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Chris Wilson Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org SGkgQ2hyaXMsCgo+IC0tLSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2d0L2ludGVsX2xyYy5jCj4g KysrIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvZ3QvaW50ZWxfbHJjLmMKPiBAQCAtMTE4Niw2ICsx MTg2LDIxIEBAIHN0YXRpYyB2b2lkIGV4ZWNsaXN0c19zdWJtaXRfcG9ydHMoc3RydWN0IGludGVs X2VuZ2luZV9jcyAqZW5naW5lKQo+ICAJLyogd2UgbmVlZCB0byBtYW51YWxseSBsb2FkIHRoZSBz dWJtaXQgcXVldWUgKi8KPiAgCWlmIChleGVjbGlzdHMtPmN0cmxfcmVnKQo+ICAJCXdyaXRlbChF TF9DVFJMX0xPQUQsIGV4ZWNsaXN0cy0+Y3RybF9yZWcpOwo+ICsKPiArCS8qCj4gKwkgKiBOb3cg dGhpcyBpcyBldmlsIG1hZ2ljLgo+ICsJICoKPiArCSAqIEFkZGluZyB0aGUgc2FtZSB1ZGVsYXko KSB0byBwcm9jZXNzX2NzYiBiZWZvcmUgd2UgY2xlYXIKPiArCSAqIGV4ZWNsaXN0cy0+cGVuZGlu ZyAodGhhdCBpcyBhZnRlciB3ZSByZWNlaXZlIHRoZSBIVyBhY2sgZm9yIHRoaXMKPiArCSAqIHN1 Ym1pdCBhbmQgYmVmb3JlIHdlIGNhbiBzdWJtaXQgYWdhaW4pIGRvZXMgbm90IHJlbGlldmUgdGhl IHN5bXB0b21zCj4gKwkgKiAobWFjaGluZSBsb2NrdXApLiBTbyBpcyB0aGUgYWN0aXZlIGRpZmZl cmVuY2UgaGVyZSB0aGUgd2FpdCB1bmRlcgo+ICsJICogdGhlIGlycS1vZmYgc3BpbmxvY2s/IFRo YXQgZ2l2ZXMgbW9yZSBjcmVkYW5jZSB0byB0aGUgdGhlb3J5IHRoYXQKPiArCSAqIHRoZSBpc3N1 ZSBpcyBpbnRlcnJ1cHQgZGVsaXZlcnkuIEFsc28gbm90ZSB0aGF0IHdlIHN0aWxsIHJlbHkgb24K PiArCSAqIGRpc2FibGluZyBSUFMsIGFnYWluIHRoYXQgc2VlbXMgbGlrZSBhbiBpc3N1ZSB3aXRo IHNpbXVsdGFuZW91cwo+ICsJICogR1QgaW50ZXJydXB0cyBiZWluZyBkZWxpdmVyZWQgdG8gdGhl IHNhbWUgQ1BVLgo+ICsJICovCj4gKwlpZiAoSVNfVElHRVJMQUtFKGVuZ2luZS0+aTkxNSkpCj4g KwkJdWRlbGF5KDI1MCk7Cgp5b3Ugd2FudCBhIGRlbGF5IG9mIDI1MHVzLiBUd28gcXVlc3Rpb25z OgoKMS4gd2h5IDI1MD8KCjIuIGlzIHRoZXJlIGFueSBnb29kIHJlYXNvbiBmb3IgdXNpbmcgJ3Vk ZWxheScgZm9yIHNsZWVwaW5nIDI1MHVzCiAgICh0aGF0IGlzIHF1aXRlIGEgbG9uZyB0aW1lKSBh bmQgbm90ICd1c2xlZXAnPwoKVGhhbmtzLApBbmRpCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxp c3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFu L2xpc3RpbmZvL2ludGVsLWdmeA==