From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michel Thierry Subject: Re: [PATCH] drm/i915: Consider HW CSB write pointer before resetting the sw read pointer Date: Fri, 25 Sep 2015 18:33:35 +0100 Message-ID: <5605856F.8020903@intel.com> References: <1443019430-20792-1-git-send-email-michel.thierry@intel.com> <87fv22a4gt.fsf@gaia.fi.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id C6A057201B for ; Fri, 25 Sep 2015 10:34:00 -0700 (PDT) In-Reply-To: <87fv22a4gt.fsf@gaia.fi.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Mika Kuoppala , intel-gfx@lists.freedesktop.org Cc: deepak.s@intel.com List-Id: intel-gfx@lists.freedesktop.org T24gOS8yNS8yMDE1IDQ6NDQgUE0sIE1pa2EgS3VvcHBhbGEgd3JvdGU6Cj4gTWljaGVsIFRoaWVy cnkgPG1pY2hlbC50aGllcnJ5QGludGVsLmNvbT4gd3JpdGVzOgo+PiAtCXJpbmctPm5leHRfY29u dGV4dF9zdGF0dXNfYnVmZmVyID0gMDsKPj4gKwo+PiArCS8qCj4+ICsJICogSW5zdGVhZCBvZiBy ZXNldHRpbmcgdGhlIENvbnRleHQgU3RhdHVzIEJ1ZmZlciAoQ1NCKSByZWFkIHBvaW50ZXIgdG8K Pj4gKwkgKiB6ZXJvLCB3ZSBuZWVkIHRvIHJlYWQgdGhlIHdyaXRlIHBvaW50ZXIgZnJvbSBoYXJk d2FyZSBhbmQgdXNlIGl0cwo+PiArCSAqIHZhbHVlIGJlY2F1c2UgInRoaXMgcmVnaXN0ZXIgaXMg cG93ZXIgY29udGV4dCBzYXZlIHJlc3RvcmVkIi4KPj4gKwkgKiBFZmZlY3RpdmVseSwgdGhlc2Ug c3RhdGVzIGhhdmUgYmVlbiBvYnNlcnZlZDoKPj4gKwkgKgo+PiArCSAqICAgICAgfCBTdXNwZW5k LXRvLWlkbGUgKGZyZWV6ZSkgfCBTdXNwZW5kLXRvLVJBTSAobWVtKSB8Cj4+ICsJICogQkRXICB8 IENTQiByZWdzIG5vdCByZXNldCAgICAgICB8IENTQiByZWdzIHJlc2V0ICAgICAgIHwKPj4gKwkg KiBDSFQgIHwgQ1NCIHJlZ3Mgbm90IHJlc2V0ICAgICAgIHwgQ1NCIHJlZ3Mgbm90IHJlc2V0ICAg fAo+PiArCSAqLwo+PiArCW5leHRfY29udGV4dF9zdGF0dXNfYnVmZmVyX2h3ID0gSTkxNV9SRUFE KFJJTkdfQ09OVEVYVF9TVEFUVVNfUFRSKHJpbmcpKSAmIDB4MDc7Cj4+ICsKPj4gKwkvKgo+PiAr CSAqIFdoZW4gdGhlIENTQiByZWdpc3RlcnMgYXJlIHJlc2V0IChhbHNvIGFmdGVyIHBvd2VyLXVw IC8gZ3B1IHJlc2V0KSwKPj4gKwkgKiBDU0Igd3JpdGUgcG9pbnRlciBpcyBzZXQgdG8gYWxsIDEn cywgd2hpY2ggaXMgbm90IHZhbGlkLCB1c2UgMCBpbgo+PiArCSAqIHRoaXMgc3BlY2lhbCBjYXNl Lgo+PiArCSAqLwo+PiArCWlmIChuZXh0X2NvbnRleHRfc3RhdHVzX2J1ZmZlcl9odyA9PSAweDcp Cj4+ICsJCW5leHRfY29udGV4dF9zdGF0dXNfYnVmZmVyX2h3ID0gMDsKPgo+Cj4gSWYgaGFyZHdh cmUgaGFzIGJlZW4gcmVzZXQgYW5kIHdlIGhhdmUgYjExMSBoZXJlLCBJIGFzc3VtZQo+IHRoZSBm aXJzdCB3cml0ZSB3aWxsIGJlIGF0IGluZGV4IHplcm8uCj4KPiBJZiB3ZSBsb29rIGF0IHRoZSBp bnRlcnJ1cHQgY29kZSB0aGVyZSBpcyB3aGlsZSAocmVhZF9wb2ludGVyIDwKPiB3cml0ZV9wb2lu dGVyKS4gSW5pdGlhbGl6aW5nIG5leHQgc3RhdHVzIGJ1ZmZlciB0byB6ZXJvCj4gd291bGQgbWVh biB0aGF0IHlvdSBtaXNzIHRoZSBmaXJzdCB3cml0ZSB0byBjc2JbMF0uCj4KPiBJZiBiMTExIGlz IGZvdW5kLCBJIHRoaW5rIHRoZSBjb3JyZWN0IHZhbHVlIGlzIDUuCgpDb3JyZWN0LCBpdCBuZWVk cyB0byBiZSBzZXQgdG8gNS4gTHVja2lseSwgY3NiWzBdIHdvdWxkIGFsd2F5cyBiZSAKSWRsZS10 by1BY3RpdmUsIHdoaWNoIHdlIGlnbm9yZS4KCj4KPiAtTWlrYQo+Cj4KCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QK SW50ZWwtZ2Z4QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwOi8vbGlzdHMuZnJlZWRlc2t0b3Au b3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cg==