From mboxrd@z Thu Jan 1 00:00:00 1970 From: Todd Previte Subject: Re: [PATCH 1/2] drm/i915: Do a dummy DPCD read before the actual read Date: Fri, 17 Oct 2014 09:10:50 -0700 Message-ID: <54413F8A.5080309@gmail.com> References: <1413481570-18288-1-git-send-email-ville.syrjala@linux.intel.com> <87fvenm6hi.fsf@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) by gabe.freedesktop.org (Postfix) with ESMTP id BE6C16E34F for ; Fri, 17 Oct 2014 09:10:47 -0700 (PDT) Received: by mail-pa0-f52.google.com with SMTP id fb1so1071224pad.25 for ; Fri, 17 Oct 2014 09:10:47 -0700 (PDT) In-Reply-To: <87fvenm6hi.fsf@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Jani Nikula , ville.syrjala@linux.intel.com, intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Ck9uIDEwLzE3LzIwMTQgMTo0MyBBTSwgSmFuaSBOaWt1bGEgd3JvdGU6Cj4gT24gVGh1LCAxNiBP Y3QgMjAxNCwgdmlsbGUuc3lyamFsYUBsaW51eC5pbnRlbC5jb20gd3JvdGU6Cj4+IEZyb206IFZp bGxlIFN5cmrDpGzDpCA8dmlsbGUuc3lyamFsYUBsaW51eC5pbnRlbC5jb20+Cj4+Cj4+IFNvbWV0 aW1lcyB3ZSBzZWVtIHRvIGdldCB1dHRlciBnYXJiYWdlIGZyb20gRFBDRCByZWFkcy4gVGhlIHJl c3VsdGluZwo+PiBidWZmZXIgaXMgZmlsbGVkIHdpdGggdGhlIHNhbWUgYnl0ZSwgYW5kIHRoZSBv cGVyYXRpb24gY29tcGxldGVkIHdpdGhvdXQKPj4gZXJyb3JzLiBNeSBIUCBaUjI0dyBtb25pdG9y IHNlZW1zIHBhcnRpY3VsYXJseSBzdXNjZXB0aWJsZSB0byB0aGlzCj4+IHByb2JsZW0gb25jZSBp dCdzIGdvbmUgaW50byBhIHNsZWVwIG1vZGUuCj4+Cj4+IFRoZSBpc3N1ZSBzZWVtcyB0byBoYXBw ZW4gb25seSBmb3IgdGhlIGZpcnN0IEFVWCBtZXNzYWdlIHRoYXQgd2FrZXMgdGhlCj4+IHNpbmsg dXAuIEJ1dCBhcyB0aGUgZmlyc3QgQVVYIHJlYWQgd2Ugb2Z0ZW4gZG8gaXMgdGhlIERQQ0QgcmVj ZWl2ZXIKPj4gY2FwIGl0IGRvZXMgd3JlYWsgYSBiaXQgb2YgaGF2b2Mgd2l0aCBzdWJzZXF1ZW50 IGxpbmsgdHJhaW5pbmcgZXRjLiB3aGVuCj4+IHRoZSByZWNlaXZlciBjYXAgYncvbGFuZS9ldGMu IGluZm9ybWF0aW9uIGlzIGdhcmJhZ2UuCj4gVGhpcyBtYWtlcyBtZSBzdXNwZWN0IG91ciBzaW5r IGRwbXMgYW5kIHdha2UgaGFuZGxpbmcgZXZlbiBtb3JlIHRoYW4gSQo+IGFscmVhZHkgZGlkLiBT b21lb25lKHRtKSBzaG91bGQgZGlnIGludG8gdGhlIERQIGFuZCBodyBzcGVjcyBhZ2FpbiB3aXRo Cj4gZnJlc2ggZXllcy4uLgpJIGNhbiBnbyBsb29rIGludG8gdGhpcyB0b2RheS9uZXh0IHdlZWsu IFRoaXMgcHJvYmxlbSBzb3VuZHMgdmFndWVseSAKc2ltaWxhciB0byBvbmUgSSd2ZSBydW4gYWNy b3NzIGJlZm9yZS4KCi1UCgo+PiBBIHN1ZmZpY2llbnQgd29ya2Fyb3VuZCBzZWVtcyB0byBiZSB0 byBwZXJmb3JtIGEgc2luZ2xlIGJ5dGUgZHVtbXkgcmVhZAo+PiBiZWZvcmUgcmVhZGluZyB0aGUg YWN0dWFsIGRhdGEuIEkgc3VwcG9zZSB0aGF0IGp1c3Qgd2FrZXMgdXAgdGhlIHNpbmsKPj4gc3Vm ZmljaWVudGx5IGFuZCB3ZSBjYW4ganVzdCB0aHJvdyBhd2F5IHRoZSByZXR1cm5lZCBkYXRhIGlu IGNhc2UgaXQncwo+PiBjcmFwLiBEUF9EUENEX1JFViBzZWVtcyBsaWtlIGEgc3VmZmljaWVudGx5 IHNhZmUgbG9jYXRpb24gdG8gcmVhZCBoZXJlLgo+IFNlZW1zIGxpa2UgYSBwcmV0dHkgaGFybWxl c3MgdGhpbmcgdG8gZG8sIGFuZCB3ZSBhbHJlYWR5IGRvIGxvYWRzIG9mCj4gZHBjZCByZWFkcyBh bnl3YXkuIFdlIHNob3VsZCB0aHJvdyB0aGlzIGF0IHNvbWUgcmVsYXRlZCBidWdzLgo+Cj4gU28g YWNrLgo+Cj4gQlIsCj4gSmFuaS4KPgo+Cj4+IFNpZ25lZC1vZmYtYnk6IFZpbGxlIFN5cmrDpGzD pCA8dmlsbGUuc3lyamFsYUBsaW51eC5pbnRlbC5jb20+Cj4+IC0tLQo+PiAgIGRyaXZlcnMvZ3B1 L2RybS9pOTE1L2ludGVsX2RwLmMgfCA3ICsrKysrKysKPj4gICAxIGZpbGUgY2hhbmdlZCwgNyBp bnNlcnRpb25zKCspCj4+Cj4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRl bF9kcC5jIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHAuYwo+PiBpbmRleCA2NGM4ZTA0 Li5mMDdmMDJjIDEwMDY0NAo+PiAtLS0gYS9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9kcC5j Cj4+ICsrKyBiL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2RwLmMKPj4gQEAgLTI4NzAsNiAr Mjg3MCwxMyBAQCBpbnRlbF9kcF9kcGNkX3JlYWRfd2FrZShzdHJ1Y3QgZHJtX2RwX2F1eCAqYXV4 LCB1bnNpZ25lZCBpbnQgb2Zmc2V0LAo+PiAgIAlzc2l6ZV90IHJldDsKPj4gICAJaW50IGk7Cj4+ ICAgCj4+ICsJLyoKPj4gKwkgKiBTb21ldGltZSB3ZSBqdXN0IGdldCB0aGUgc2FtZSBpbmNvcnJl Y3QgYnl0ZSByZXBlYXRlZAo+PiArCSAqIG92ZXIgdGhlIGVudGlyZSBidWZmZXIuIERvaW5nIGp1 c3Qgb25lIHRocm93IGF3YXkgcmVhZAo+PiArCSAqIGluaXRpYWxseSBzZWVtcyB0byAic29sdmUi IGl0Lgo+PiArCSAqLwo+PiArCWRybV9kcF9kcGNkX3JlYWQoYXV4LCBEUF9EUENEX1JFViwgYnVm ZmVyLCAxKTsKPj4gKwo+PiAgIAlmb3IgKGkgPSAwOyBpIDwgMzsgaSsrKSB7Cj4+ICAgCQlyZXQg PSBkcm1fZHBfZHBjZF9yZWFkKGF1eCwgb2Zmc2V0LCBidWZmZXIsIHNpemUpOwo+PiAgIAkJaWYg KHJldCA9PSBzaXplKQo+PiAtLSAKPj4gMi4wLjQKPj4KPj4gX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KPj4gSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdAo+PiBJ bnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCj4+IGh0dHA6Ly9saXN0cy5mcmVlZGVza3Rv cC5vcmcvbWFpbG1hbi9saXN0aW5mby9pbnRlbC1nZngKCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QKSW50ZWwtZ2Z4 QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxt YW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cg==