From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jani Nikula Subject: Re: [PATCH 1/2] drm/i915: Do a dummy DPCD read before the actual read Date: Fri, 17 Oct 2014 11:43:21 +0300 Message-ID: <87fvenm6hi.fsf@intel.com> References: <1413481570-18288-1-git-send-email-ville.syrjala@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 737366E30F for ; Fri, 17 Oct 2014 01:43:44 -0700 (PDT) In-Reply-To: <1413481570-18288-1-git-send-email-ville.syrjala@linux.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: ville.syrjala@linux.intel.com, intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org T24gVGh1LCAxNiBPY3QgMjAxNCwgdmlsbGUuc3lyamFsYUBsaW51eC5pbnRlbC5jb20gd3JvdGU6 Cj4gRnJvbTogVmlsbGUgU3lyasOkbMOkIDx2aWxsZS5zeXJqYWxhQGxpbnV4LmludGVsLmNvbT4K Pgo+IFNvbWV0aW1lcyB3ZSBzZWVtIHRvIGdldCB1dHRlciBnYXJiYWdlIGZyb20gRFBDRCByZWFk cy4gVGhlIHJlc3VsdGluZwo+IGJ1ZmZlciBpcyBmaWxsZWQgd2l0aCB0aGUgc2FtZSBieXRlLCBh bmQgdGhlIG9wZXJhdGlvbiBjb21wbGV0ZWQgd2l0aG91dAo+IGVycm9ycy4gTXkgSFAgWlIyNHcg bW9uaXRvciBzZWVtcyBwYXJ0aWN1bGFybHkgc3VzY2VwdGlibGUgdG8gdGhpcwo+IHByb2JsZW0g b25jZSBpdCdzIGdvbmUgaW50byBhIHNsZWVwIG1vZGUuCj4KPiBUaGUgaXNzdWUgc2VlbXMgdG8g aGFwcGVuIG9ubHkgZm9yIHRoZSBmaXJzdCBBVVggbWVzc2FnZSB0aGF0IHdha2VzIHRoZQo+IHNp bmsgdXAuIEJ1dCBhcyB0aGUgZmlyc3QgQVVYIHJlYWQgd2Ugb2Z0ZW4gZG8gaXMgdGhlIERQQ0Qg cmVjZWl2ZXIKPiBjYXAgaXQgZG9lcyB3cmVhayBhIGJpdCBvZiBoYXZvYyB3aXRoIHN1YnNlcXVl bnQgbGluayB0cmFpbmluZyBldGMuIHdoZW4KPiB0aGUgcmVjZWl2ZXIgY2FwIGJ3L2xhbmUvZXRj LiBpbmZvcm1hdGlvbiBpcyBnYXJiYWdlLgoKVGhpcyBtYWtlcyBtZSBzdXNwZWN0IG91ciBzaW5r IGRwbXMgYW5kIHdha2UgaGFuZGxpbmcgZXZlbiBtb3JlIHRoYW4gSQphbHJlYWR5IGRpZC4gU29t ZW9uZSh0bSkgc2hvdWxkIGRpZyBpbnRvIHRoZSBEUCBhbmQgaHcgc3BlY3MgYWdhaW4gd2l0aApm cmVzaCBleWVzLi4uCgo+IEEgc3VmZmljaWVudCB3b3JrYXJvdW5kIHNlZW1zIHRvIGJlIHRvIHBl cmZvcm0gYSBzaW5nbGUgYnl0ZSBkdW1teSByZWFkCj4gYmVmb3JlIHJlYWRpbmcgdGhlIGFjdHVh bCBkYXRhLiBJIHN1cHBvc2UgdGhhdCBqdXN0IHdha2VzIHVwIHRoZSBzaW5rCj4gc3VmZmljaWVu dGx5IGFuZCB3ZSBjYW4ganVzdCB0aHJvdyBhd2F5IHRoZSByZXR1cm5lZCBkYXRhIGluIGNhc2Ug aXQncwo+IGNyYXAuIERQX0RQQ0RfUkVWIHNlZW1zIGxpa2UgYSBzdWZmaWNpZW50bHkgc2FmZSBs b2NhdGlvbiB0byByZWFkIGhlcmUuCgpTZWVtcyBsaWtlIGEgcHJldHR5IGhhcm1sZXNzIHRoaW5n IHRvIGRvLCBhbmQgd2UgYWxyZWFkeSBkbyBsb2FkcyBvZgpkcGNkIHJlYWRzIGFueXdheS4gV2Ug c2hvdWxkIHRocm93IHRoaXMgYXQgc29tZSByZWxhdGVkIGJ1Z3MuCgpTbyBhY2suCgpCUiwKSmFu aS4KCgo+Cj4gU2lnbmVkLW9mZi1ieTogVmlsbGUgU3lyasOkbMOkIDx2aWxsZS5zeXJqYWxhQGxp bnV4LmludGVsLmNvbT4KPiAtLS0KPiAgZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHAuYyB8 IDcgKysrKysrKwo+ICAxIGZpbGUgY2hhbmdlZCwgNyBpbnNlcnRpb25zKCspCj4KPiBkaWZmIC0t Z2l0IGEvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHAuYyBiL2RyaXZlcnMvZ3B1L2RybS9p OTE1L2ludGVsX2RwLmMKPiBpbmRleCA2NGM4ZTA0Li5mMDdmMDJjIDEwMDY0NAo+IC0tLSBhL2Ry aXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2RwLmMKPiArKysgYi9kcml2ZXJzL2dwdS9kcm0vaTkx NS9pbnRlbF9kcC5jCj4gQEAgLTI4NzAsNiArMjg3MCwxMyBAQCBpbnRlbF9kcF9kcGNkX3JlYWRf d2FrZShzdHJ1Y3QgZHJtX2RwX2F1eCAqYXV4LCB1bnNpZ25lZCBpbnQgb2Zmc2V0LAo+ICAJc3Np emVfdCByZXQ7Cj4gIAlpbnQgaTsKPiAgCj4gKwkvKgo+ICsJICogU29tZXRpbWUgd2UganVzdCBn ZXQgdGhlIHNhbWUgaW5jb3JyZWN0IGJ5dGUgcmVwZWF0ZWQKPiArCSAqIG92ZXIgdGhlIGVudGly ZSBidWZmZXIuIERvaW5nIGp1c3Qgb25lIHRocm93IGF3YXkgcmVhZAo+ICsJICogaW5pdGlhbGx5 IHNlZW1zIHRvICJzb2x2ZSIgaXQuCj4gKwkgKi8KPiArCWRybV9kcF9kcGNkX3JlYWQoYXV4LCBE UF9EUENEX1JFViwgYnVmZmVyLCAxKTsKPiArCj4gIAlmb3IgKGkgPSAwOyBpIDwgMzsgaSsrKSB7 Cj4gIAkJcmV0ID0gZHJtX2RwX2RwY2RfcmVhZChhdXgsIG9mZnNldCwgYnVmZmVyLCBzaXplKTsK PiAgCQlpZiAocmV0ID09IHNpemUpCj4gLS0gCj4gMi4wLjQKPgo+IF9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCj4gSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdAo+ IEludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKPiBodHRwOi8vbGlzdHMuZnJlZWRlc2t0 b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4CgotLSAKSmFuaSBOaWt1bGEsIEludGVs IE9wZW4gU291cmNlIFRlY2hub2xvZ3kgQ2VudGVyCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCkludGVsLWdmeCBtYWlsaW5nIGxpc3QKSW50ZWwtZ2Z4QGxp c3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4v bGlzdGluZm8vaW50ZWwtZ2Z4Cg==