From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: Re: [PATCH 13/21] drm/dp: Do not busy-loop during link training Date: Thu, 08 Aug 2019 15:33:27 +0200 Message-ID: <1565271207.3656.17.camel@pengutronix.de> References: <20190805122350.8838-1-thierry.reding@gmail.com> <20190805122350.8838-13-thierry.reding@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by gabe.freedesktop.org (Postfix) with ESMTPS id 13E238984C for ; Thu, 8 Aug 2019 13:33:29 +0000 (UTC) In-Reply-To: <20190805122350.8838-13-thierry.reding@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Thierry Reding , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org T24gTW9uLCAyMDE5LTA4LTA1IGF0IDE0OjIzICswMjAwLCBUaGllcnJ5IFJlZGluZyB3cm90ZToK PiBGcm9tOiBUaGllcnJ5IFJlZGluZyA8dHJlZGluZ0BudmlkaWEuY29tPgo+IAo+IFVzZSBtaWNy b3NlY29uZCBzbGVlcHMgZm9yIHRoZSBjbG9jayByZWNvdmVyeSBhbmQgY2hhbm5lbCBlcXVhbGl6 YXRpb24KPiBkZWxheXMgZHVyaW5nIGxpbmsgdHJhaW5pbmcuIFRoZSBkdXJhdGlvbiBvZiB0aGVz ZSBkZWxheXMgY2FuIGJlIGZyb20KPiAxMDAgdXMgdXAgdG8gMTYgbXMuIEl0IGlzIHJ1ZGUgdG8g YnVzeS1sb29wIGZvciB0aGF0IGFtb3VudCBvZiB0aW1lLgo+IAo+IFdoaWxlIGF0IGl0LCBhbHNv IGNvbnZlcnQgdG8gc3RhbmRhcmQgY29kaW5nIHN0eWxlIGJ5IHB1dHRpbmcgdGhlCj4gb3Blbmlu ZyBicmFjZXMgaW4gYSBmdW5jdGlvbiBkZWZpbml0aW9uIG9uIGEgbmV3IGxpbmUuCj4gCj4gU2ln bmVkLW9mZi1ieTogVGhpZXJyeSBSZWRpbmcgPHRyZWRpbmdAbnZpZGlhLmNvbT4KPiAtLS0KPiAg ZHJpdmVycy9ncHUvZHJtL2RybV9kcF9oZWxwZXIuYyB8IDMwICsrKysrKysrKysrKysrKysrKy0t LS0tLS0tLS0tLQo+ICAxIGZpbGUgY2hhbmdlZCwgMTggaW5zZXJ0aW9ucygrKSwgMTIgZGVsZXRp b25zKC0pCj4gCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9kcm1fZHBfaGVscGVyLmMg Yi9kcml2ZXJzL2dwdS9kcm0vZHJtX2RwX2hlbHBlci5jCj4gaW5kZXggNDExMjU3MGRiZTY3Li4z NDRmODg3ZmVmMmMgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9ncHUvZHJtL2RybV9kcF9oZWxwZXIu Ywo+ICsrKyBiL2RyaXZlcnMvZ3B1L2RybS9kcm1fZHBfaGVscGVyLmMKPiBAQCAtMTIwLDMzICsx MjAsMzkgQEAgdTggZHJtX2RwX2dldF9hZGp1c3RfcmVxdWVzdF9wcmVfZW1waGFzaXMoY29uc3Qg dTggbGlua19zdGF0dXNbRFBfTElOS19TVEFUVVNfU0kKPiAgfQo+ICBFWFBPUlRfU1lNQk9MKGRy bV9kcF9nZXRfYWRqdXN0X3JlcXVlc3RfcHJlX2VtcGhhc2lzKTsKPiAgCj4gLXZvaWQgZHJtX2Rw X2xpbmtfdHJhaW5fY2xvY2tfcmVjb3ZlcnlfZGVsYXkoY29uc3QgdTggZHBjZFtEUF9SRUNFSVZF Ul9DQVBfU0laRV0pIHsKPiAtCWludCByZF9pbnRlcnZhbCA9IGRwY2RbRFBfVFJBSU5JTkdfQVVY X1JEX0lOVEVSVkFMXSAmCj4gLQkJCSAgRFBfVFJBSU5JTkdfQVVYX1JEX01BU0s7Cj4gK3ZvaWQg ZHJtX2RwX2xpbmtfdHJhaW5fY2xvY2tfcmVjb3ZlcnlfZGVsYXkoY29uc3QgdTggZHBjZFtEUF9S RUNFSVZFUl9DQVBfU0laRV0pCj4gK3sKPiArCXVuc2lnbmVkIGludCByZF9pbnRlcnZhbCA9IGRw Y2RbRFBfVFJBSU5JTkdfQVVYX1JEX0lOVEVSVkFMXSAmCj4gKwkJCQkJRFBfVFJBSU5JTkdfQVVY X1JEX01BU0s7Cj4gIAo+ICAJaWYgKHJkX2ludGVydmFsID4gNCkKPiAtCQlEUk1fREVCVUdfS01T KCJBVVggaW50ZXJ2YWwgJWQsIG91dCBvZiByYW5nZSAobWF4IDQpXG4iLAo+ICsJCURSTV9ERUJV R19LTVMoIkFVWCBpbnRlcnZhbCAldSwgb3V0IG9mIHJhbmdlIChtYXggNClcbiIsCj4gIAkJCSAg ICAgIHJkX2ludGVydmFsKTsKPiAgCj4gIAlpZiAocmRfaW50ZXJ2YWwgPT0gMCB8fCBkcGNkW0RQ X0RQQ0RfUkVWXSA+PSBEUF9EUENEX1JFVl8xNCkKPiAtCQl1ZGVsYXkoMTAwKTsKPiArCQlyZF9p bnRlcnZhbCA9IDEwMDsKPiAgCWVsc2UKPiAtCQltZGVsYXkocmRfaW50ZXJ2YWwgKiA0KTsKCnJk X2ludGVydmFsIHdhcyBpbiB1bml0cyBvZiA0IG1zLgoKPiArCQlyZF9pbnRlcnZhbCAqPSA0OwoK VGhpcyBzaG91bGQgYmUgKj0gNDAwMCBzaW5jZSB0aGUgcmVzdWx0IGlzIGZlZCBpbnRvIHVzbGVl cF9yYW5nZSBpbnN0ZWFkCm9mIG1kZWxheS4KCj4gKwo+ICsJdXNsZWVwX3JhbmdlKHJkX2ludGVy dmFsLCByZF9pbnRlcnZhbCAqIDIpOwo+ICB9Cj4gIEVYUE9SVF9TWU1CT0woZHJtX2RwX2xpbmtf dHJhaW5fY2xvY2tfcmVjb3ZlcnlfZGVsYXkpOwo+ICAKPiAtdm9pZCBkcm1fZHBfbGlua190cmFp bl9jaGFubmVsX2VxX2RlbGF5KGNvbnN0IHU4IGRwY2RbRFBfUkVDRUlWRVJfQ0FQX1NJWkVdKSB7 Cj4gLQlpbnQgcmRfaW50ZXJ2YWwgPSBkcGNkW0RQX1RSQUlOSU5HX0FVWF9SRF9JTlRFUlZBTF0g Jgo+IC0JCQkgIERQX1RSQUlOSU5HX0FVWF9SRF9NQVNLOwo+ICt2b2lkIGRybV9kcF9saW5rX3Ry YWluX2NoYW5uZWxfZXFfZGVsYXkoY29uc3QgdTggZHBjZFtEUF9SRUNFSVZFUl9DQVBfU0laRV0p Cj4gK3sKPiArCXVuc2lnbmVkIGludCByZF9pbnRlcnZhbCA9IGRwY2RbRFBfVFJBSU5JTkdfQVVY X1JEX0lOVEVSVkFMXSAmCj4gKwkJCQkJRFBfVFJBSU5JTkdfQVVYX1JEX01BU0s7Cj4gIAo+ICAJ aWYgKHJkX2ludGVydmFsID4gNCkKPiAtCQlEUk1fREVCVUdfS01TKCJBVVggaW50ZXJ2YWwgJWQs IG91dCBvZiByYW5nZSAobWF4IDQpXG4iLAo+ICsJCURSTV9ERUJVR19LTVMoIkFVWCBpbnRlcnZh bCAldSwgb3V0IG9mIHJhbmdlIChtYXggNClcbiIsCj4gIAkJCSAgICAgIHJkX2ludGVydmFsKTsK PiAgCj4gIAlpZiAocmRfaW50ZXJ2YWwgPT0gMCkKPiAtCQl1ZGVsYXkoNDAwKTsKPiArCQlyZF9p bnRlcnZhbCA9IDQwMDsKPiAgCWVsc2UKPiAtCQltZGVsYXkocmRfaW50ZXJ2YWwgKiA0KTsKPiAr CQlyZF9pbnRlcnZhbCAqPSA0OwoKU2FtZSBhcyBhYm92ZS4KCj4gKwo+ICsJdXNsZWVwX3Jhbmdl KHJkX2ludGVydmFsLCByZF9pbnRlcnZhbCAqIDIpOwo+ICB9Cj4gIEVYUE9SVF9TWU1CT0woZHJt X2RwX2xpbmtfdHJhaW5fY2hhbm5lbF9lcV9kZWxheSk7Cj4gIAoKcmVnYXJkcwpQaGlsaXBwCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBt YWlsaW5nIGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3Rz LmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbA==