From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jani Nikula <jani.nikula@linux.intel.com>
Subject: Re: [PATCH] drm/i915: DP link training optimization
Date: Wed, 11 Feb 2015 16:57:06 +0200
Message-ID: <8761b8ts1p.fsf@intel.com>
References: <1423663387-4257-1-git-send-email-mika.kahola@intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga01.intel.com (mga01.intel.com [192.55.52.88])
 by gabe.freedesktop.org (Postfix) with ESMTP id CD1496E2FE
 for <intel-gfx@lists.freedesktop.org>; Wed, 11 Feb 2015 06:56:01 -0800 (PST)
In-Reply-To: <1423663387-4257-1-git-send-email-mika.kahola@intel.com>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Mika Kahola <mika.kahola@intel.com>, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

T24gV2VkLCAxMSBGZWIgMjAxNSwgTWlrYSBLYWhvbGEgPG1pa2Eua2Fob2xhQGludGVsLmNvbT4g
d3JvdGU6Cj4gUmV1c2UgZXhpc3RpbmcgRFAgbGluayB0cmFpbmluZyB2YWx1ZXMgaS5lLiB2b2x0
YWdlIHN3aW5nCj4gYW5kIHByZS1lbXBoYXNpcyBsZXZlbHMsIGlmIERQIHBvcnQgdGhhdCB3ZSBh
cmUgY29ubmVjdGVkCj4gdG8gaGFzbid0IGNoYW5nZWQuIElmIHdlIGFyZSB1bmFibGUgdG8gcmUt
aW5pdGlhbGl6ZSBEUAo+IGxpbmssIHRoZSBmYWxsYmFjayBpcyB0byByZXNldCB0aGUgbGluayB0
cmFpbmluZyB2YWx1ZXMsCj4gYW5kIHJlc3RhcnQuCgpTb3JyeSwgSSBmYWlsZWQgdG8gcmVtaW5k
IHlvdSB0byBzaWduIHlvdXIgd29yazoKClNpZ25lZC1vZmYtYnk6IE1pa2EgS2Fob2xhIDxtaWth
LmthaG9sYUBpbnRlbC5jb20+CgpzZWUgRG9jdW1lbnRhdGlvbi9TdWJtaXR0aW5nUGF0Y2hlcyBm
b3IgZGV0YWlscy4KCkJSLApKYW5pLgoKCj4gCW1vZGlmaWVkOiAgIGludGVsX2RwLmMKPiAJbW9k
aWZpZWQ6ICAgaW50ZWxfZHJ2LmgKPiAtLS0KPiAgZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxf
ZHAuYyAgfCA3NSArKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKy0tLS0tCj4gIGRy
aXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2Rydi5oIHwgIDIgKysKPiAgMiBmaWxlcyBjaGFuZ2Vk
LCA2OSBpbnNlcnRpb25zKCspLCA4IGRlbGV0aW9ucygtKQo+Cj4gZGlmZiAtLWdpdCBhL2RyaXZl
cnMvZ3B1L2RybS9pOTE1L2ludGVsX2RwLmMgYi9kcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9k
cC5jCj4gaW5kZXggODY4YTA3Yi4uYzQwZDY0YSAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL2dwdS9k
cm0vaTkxNS9pbnRlbF9kcC5jCj4gKysrIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHAu
Ywo+IEBAIC0zMjg2LDYgKzMyODYsMjUgQEAgaW50ZWxfZHBfcmVzZXRfbGlua190cmFpbihzdHJ1
Y3QgaW50ZWxfZHAgKmludGVsX2RwLCB1aW50MzJfdCAqRFAsCj4gIH0KPiAgCj4gIHN0YXRpYyBi
b29sCj4gK2ludGVsX2RwX3JldXNlX2xpbmtfdHJhaW4oc3RydWN0IGludGVsX2RwICppbnRlbF9k
cCwgdWludDMyX3QgKkRQLAo+ICsJCQkgIHVpbnQ4X3QgZHBfdHJhaW5fcGF0KQo+ICt7Cj4gKwlz
dHJ1Y3QgaW50ZWxfZGlnaXRhbF9wb3J0ICppbnRlbF9kaWdfcG9ydCA9IGRwX3RvX2RpZ19wb3J0
KGludGVsX2RwKTsKPiArCXN0cnVjdCBkcm1fZGV2aWNlICpkZXYgPSBpbnRlbF9kaWdfcG9ydC0+
YmFzZS5iYXNlLmRldjsKPiArCXN0cnVjdCBkcm1faTkxNV9wcml2YXRlICpkZXZfcHJpdiA9IGRl
di0+ZGV2X3ByaXZhdGU7Cj4gKwo+ICsJaW50ZWxfZHBfc2V0X3NpZ25hbF9sZXZlbHMoaW50ZWxf
ZHAsIERQKTsKPiArCj4gKwlJOTE1X1dSSVRFKGludGVsX2RwLT5vdXRwdXRfcmVnLCAqRFApOwo+
ICsJUE9TVElOR19SRUFEKGludGVsX2RwLT5vdXRwdXRfcmVnKTsKPiArCj4gKwlkcm1fZHBfZHBj
ZF93cml0ZSgmaW50ZWxfZHAtPmF1eCwgRFBfVFJBSU5JTkdfTEFORTBfU0VULAo+ICsJCQkgIGlu
dGVsX2RwLT50cmFpbl9zZXQsIGludGVsX2RwLT5sYW5lX2NvdW50KTsKPiArCj4gKwlyZXR1cm4g
aW50ZWxfZHBfc2V0X2xpbmtfdHJhaW4oaW50ZWxfZHAsIERQLCBkcF90cmFpbl9wYXQpOwo+ICt9
Cj4gKwo+ICtzdGF0aWMgYm9vbAo+ICBpbnRlbF9kcF91cGRhdGVfbGlua190cmFpbihzdHJ1Y3Qg
aW50ZWxfZHAgKmludGVsX2RwLCB1aW50MzJfdCAqRFAsCj4gIAkJCSAgIGNvbnN0IHVpbnQ4X3Qg
bGlua19zdGF0dXNbRFBfTElOS19TVEFUVVNfU0laRV0pCj4gIHsKPiBAQCAtMzM0OCw2ICszMzY3
LDggQEAgaW50ZWxfZHBfc3RhcnRfbGlua190cmFpbihzdHJ1Y3QgaW50ZWxfZHAgKmludGVsX2Rw
KQo+ICAJaW50IHZvbHRhZ2VfdHJpZXMsIGxvb3BfdHJpZXM7Cj4gIAl1aW50MzJfdCBEUCA9IGlu
dGVsX2RwLT5EUDsKPiAgCXVpbnQ4X3QgbGlua19jb25maWdbMl07Cj4gKwl1aW50OF90IGxpbmtf
c3RhdHVzW0RQX0xJTktfU1RBVFVTX1NJWkVdOwo+ICsJYm9vbCByZXVzZV90cmFpbl9zZXQgPSBm
YWxzZTsKPiAgCj4gIAlpZiAoSEFTX0RESShkZXYpKQo+ICAJCWludGVsX2RkaV9wcmVwYXJlX2xp
bmtfcmV0cmFpbihlbmNvZGVyKTsKPiBAQCAtMzM2NSwyMCArMzM4NiwzNiBAQCBpbnRlbF9kcF9z
dGFydF9saW5rX3RyYWluKHN0cnVjdCBpbnRlbF9kcCAqaW50ZWxfZHApCj4gIAo+ICAJRFAgfD0g
RFBfUE9SVF9FTjsKPiAgCj4gLQkvKiBjbG9jayByZWNvdmVyeSAqLwo+IC0JaWYgKCFpbnRlbF9k
cF9yZXNldF9saW5rX3RyYWluKGludGVsX2RwLCAmRFAsCj4gLQkJCQkgICAgICAgRFBfVFJBSU5J
TkdfUEFUVEVSTl8xIHwKPiAtCQkJCSAgICAgICBEUF9MSU5LX1NDUkFNQkxJTkdfRElTQUJMRSkp
IHsKPiAtCQlEUk1fRVJST1IoImZhaWxlZCB0byBlbmFibGUgbGluayB0cmFpbmluZ1xuIik7Cj4g
LQkJcmV0dXJuOwo+ICsJLyoKPiArCSAqIGNoZWNrIGlmIERQIGNvbm5lY3RvciBoYXMgY2hhbmdl
ZC4gUmVzZXQgdm9sdGFnZSBzd2luZyBhbmQKPiArCSAqIHByZS1lbXBoYXNpcyBsZXZlbHMgaWYg
dGhhdCdzIHRoZSBjYXNlLgo+ICsJICovCj4gKwlpZiAoaW50ZWxfZHAtPmNvbm5lY3Rvcl9jaGFu
Z2VkKSB7Cj4gKwkJLyogcmVzZXQgbGluayB0cmFpbmluZyB2YWx1ZXMgKi8KPiArCQlEUk1fREVC
VUdfS01TKCJyZXNldHRpbmcgbGluayB0cmFpbiBzZXRcbiIpOwo+ICsJCWlmICghaW50ZWxfZHBf
cmVzZXRfbGlua190cmFpbihpbnRlbF9kcCwgJkRQLAo+ICsJCQkJCSAgICAgICBEUF9UUkFJTklO
R19QQVRURVJOXzEgfAo+ICsJCQkJCSAgICAgICBEUF9MSU5LX1NDUkFNQkxJTkdfRElTQUJMRSkp
IHsKPiArCQkJRFJNX0VSUk9SKCJmYWlsZWQgdG8gZW5hYmxlIGxpbmsgdHJhaW5pbmdcbiIpOwo+
ICsJCQlyZXR1cm47Cj4gKwkJfQo+ICsJCXJldXNlX3RyYWluX3NldCA9IGZhbHNlOwo+ICsJfQo+
ICsJZWxzZSB7Cj4gKwkJRFJNX0RFQlVHX0tNUygicmV1c2luZyBjdXJyZW50IGxpbmsgdHJhaW4g
c2V0XG4iKTsKPiArCQlpZiAoIWludGVsX2RwX3JldXNlX2xpbmtfdHJhaW4oaW50ZWxfZHAsICZE
UCwKPiArCQkJCQkgICAgICAgRFBfVFJBSU5JTkdfUEFUVEVSTl8xIHwKPiArCQkJCQkgICAgICAg
RFBfTElOS19TQ1JBTUJMSU5HX0RJU0FCTEUpKSB7Cj4gKwkJCURSTV9ERUJVR19LTVMoInVuYWJs
ZSB0byBzZXQga25vd24gbGluayB0cmFpbmluZyB2YWx1ZXNcbiIpOwo+ICsJCQlyZXR1cm47Cj4g
KwkJfQo+ICsJCXJldXNlX3RyYWluX3NldCA9IHRydWU7Cj4gIAl9Cj4gIAo+ICAJdm9sdGFnZSA9
IDB4ZmY7Cj4gIAl2b2x0YWdlX3RyaWVzID0gMDsKPiAgCWxvb3BfdHJpZXMgPSAwOwo+ICAJZm9y
ICg7Oykgewo+IC0JCXVpbnQ4X3QgbGlua19zdGF0dXNbRFBfTElOS19TVEFUVVNfU0laRV07Cj4g
LQo+ICAJCWRybV9kcF9saW5rX3RyYWluX2Nsb2NrX3JlY292ZXJ5X2RlbGF5KGludGVsX2RwLT5k
cGNkKTsKPiAgCQlpZiAoIWludGVsX2RwX2dldF9saW5rX3N0YXR1cyhpbnRlbF9kcCwgbGlua19z
dGF0dXMpKSB7Cj4gIAkJCURSTV9FUlJPUigiZmFpbGVkIHRvIGdldCBsaW5rIHN0YXR1c1xuIik7
Cj4gQEAgLTMzODksNiArMzQyNiwyMCBAQCBpbnRlbF9kcF9zdGFydF9saW5rX3RyYWluKHN0cnVj
dCBpbnRlbF9kcCAqaW50ZWxfZHApCj4gIAkJCURSTV9ERUJVR19LTVMoImNsb2NrIHJlY292ZXJ5
IE9LXG4iKTsKPiAgCQkJYnJlYWs7Cj4gIAkJfQo+ICsJCS8qCj4gKwkJICogaWYgd2UgdXNlZCBw
cmV2aW91c2x5IHRyYWluZWQgdm9sdGFnZSBhbmQgcHJlLWVtcGhhc2lzIHZhbHVlcwo+ICsJCSAq
IGFuZCB3ZSBkb24ndCBnZXQgY2xvY2sgcmVjb3ZlcnksIHJlc2V0IGxpbmsgdHJhaW5pbmcgdmFs
dWVzCj4gKwkJICovCj4gKwkJaWYgKHJldXNlX3RyYWluX3NldCkgewo+ICsJCQlEUk1fREVCVUdf
S01TKCJjbG9jayByZWNvdmVyeSBub3Qgb2ssIHJlc2V0dGluZyBEUCB0cmFpbiBzZXRcbiIpOwo+
ICsJCQlpZiAoIWludGVsX2RwX3Jlc2V0X2xpbmtfdHJhaW4oaW50ZWxfZHAsICZEUCwKPiArCQkJ
CQkJICAgICAgIERQX1RSQUlOSU5HX1BBVFRFUk5fMSB8Cj4gKwkJCQkJCSAgICAgICBEUF9MSU5L
X1NDUkFNQkxJTkdfRElTQUJMRSkpIHsKPiArCQkJCURSTV9FUlJPUigiZmFpbGVkIHRvIGVuYWJs
ZSBsaW5rIHRyYWluaW5nXG4iKTsKPiArCQkJCXJldHVybjsKPiArCQkJfQo+ICsJCQlyZXVzZV90
cmFpbl9zZXQgPSBmYWxzZTsKPiArCQl9Cj4gIAo+ICAJCS8qIENoZWNrIHRvIHNlZSBpZiB3ZSd2
ZSB0cmllZCB0aGUgbWF4IHZvbHRhZ2UgKi8KPiAgCQlmb3IgKGkgPSAwOyBpIDwgaW50ZWxfZHAt
PmxhbmVfY291bnQ7IGkrKykKPiBAQCAtNDA3Niw2ICs0MTI3LDE0IEBAIGludGVsX2RwX2RldGVj
dChzdHJ1Y3QgZHJtX2Nvbm5lY3RvciAqY29ubmVjdG9yLCBib29sIGZvcmNlKQo+ICAJCSAgICAg
IGNvbm5lY3Rvci0+YmFzZS5pZCwgY29ubmVjdG9yLT5uYW1lKTsKPiAgCWludGVsX2RwX3Vuc2V0
X2VkaWQoaW50ZWxfZHApOwo+ICAKPiArCWlmIChjb25uZWN0b3ItPmJhc2UuaWQgIT0gaW50ZWxf
ZHAtPmNvbm5lY3Rvcl9pZCkgewo+ICsJCWludGVsX2RwLT5jb25uZWN0b3JfaWQgPSBjb25uZWN0
b3ItPmJhc2UuaWQ7Cj4gKwkJRFJNX0RFQlVHX0tNUygiRFAgY29ubmVjdG9yIGNoYW5nZWRcbiIp
Owo+ICsJCWludGVsX2RwLT5jb25uZWN0b3JfY2hhbmdlZCA9IHRydWU7Cj4gKwl9Cj4gKwllbHNl
Cj4gKwkJaW50ZWxfZHAtPmNvbm5lY3Rvcl9jaGFuZ2VkID0gZmFsc2U7Cj4gKwo+ICAJaWYgKGlu
dGVsX2RwLT5pc19tc3QpIHsKPiAgCQkvKiBNU1QgZGV2aWNlcyBhcmUgZGlzY29ubmVjdGVkIGZy
b20gYSBtb25pdG9yIFBPViAqLwo+ICAJCWlmIChpbnRlbF9lbmNvZGVyLT50eXBlICE9IElOVEVM
X09VVFBVVF9FRFApCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2Ry
di5oIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHJ2LmgKPiBpbmRleCAxZGU4ZTIwLi4y
ODc3MjI2IDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX2Rydi5oCj4g
KysrIGIvZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZHJ2LmgKPiBAQCAtNjQ4LDYgKzY0OCw4
IEBAIHN0cnVjdCBpbnRlbF9kcCB7Cj4gIAkJCQkgICAgIGJvb2wgaGFzX2F1eF9pcnEsCj4gIAkJ
CQkgICAgIGludCBzZW5kX2J5dGVzLAo+ICAJCQkJICAgICB1aW50MzJfdCBhdXhfY2xvY2tfZGl2
aWRlcik7Cj4gKwl1aW50MzJfdCBjb25uZWN0b3JfaWQ7Cj4gKwlib29sIGNvbm5lY3Rvcl9jaGFu
Z2VkOwo+ICB9Owo+ICAKPiAgc3RydWN0IGludGVsX2RpZ2l0YWxfcG9ydCB7Cj4gLS0gCj4gMS45
LjEKPgo+IC0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t
LS0tLS0tLS0tLS0tLS0tLS0tLQo+IEludGVsIEZpbmxhbmQgT3kKPiBSZWdpc3RlcmVkIEFkZHJl
c3M6IFBMIDI4MSwgMDAxODEgSGVsc2lua2kgCj4gQnVzaW5lc3MgSWRlbnRpdHkgQ29kZTogMDM1
NzYwNiAtIDQgCj4gRG9taWNpbGVkIGluIEhlbHNpbmtpIAo+Cj4gVGhpcyBlLW1haWwgYW5kIGFu
eSBhdHRhY2htZW50cyBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgbWF0ZXJpYWwgZm9yCj4gdGhl
IHNvbGUgdXNlIG9mIHRoZSBpbnRlbmRlZCByZWNpcGllbnQocykuIEFueSByZXZpZXcgb3IgZGlz
dHJpYnV0aW9uCj4gYnkgb3RoZXJzIGlzIHN0cmljdGx5IHByb2hpYml0ZWQuIElmIHlvdSBhcmUg
bm90IHRoZSBpbnRlbmRlZAo+IHJlY2lwaWVudCwgcGxlYXNlIGNvbnRhY3QgdGhlIHNlbmRlciBh
bmQgZGVsZXRlIGFsbCBjb3BpZXMuCj4KPiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX19fX19fX19fXwo+IEludGVsLWdmeCBtYWlsaW5nIGxpc3QKPiBJbnRlbC1nZnhAbGlz
dHMuZnJlZWRlc2t0b3Aub3JnCj4gaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFu
L2xpc3RpbmZvL2ludGVsLWdmeAoKLS0gCkphbmkgTmlrdWxhLCBJbnRlbCBPcGVuIFNvdXJjZSBU
ZWNobm9sb2d5IENlbnRlcgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3Rv
cC5vcmcKaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVs
LWdmeAo=