From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lyude Subject: [PATCH v5 3/4] drm/dp_helper: Perform throw-away read before actual read in drm_dp_dpcd_read() Date: Wed, 13 Apr 2016 10:58:32 -0400 Message-ID: <1460559513-32280-4-git-send-email-cpaul@redhat.com> References: <87d1pvt9ka.fsf@intel.com> <1460559513-32280-1-git-send-email-cpaul@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1460559513-32280-1-git-send-email-cpaul@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Jani Nikula , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Cc: David Airlie , open list List-Id: dri-devel@lists.freedesktop.org VGhpcyBpcyBwYXJ0IG9mIGEgcGF0Y2ggc2VyaWVzIHRvIG1pZ3JhdGUgYWxsIG9mIHRoZSB3b3Jr YXJvdW5kcyBmb3IKY29tbW9ubHkgc2VlbiBiZWhhdmlvciBmcm9tIGJhZCBzaW5rcyBpbiBpbnRl bF9kcF9kcGNkX3JlYWRfd2FrZSgpIHRvIGRybSdzCkRQIGhlbHBlci4KClNvbWUgc2lua3Mgd2ls bCBqdXN0IHJldHVybiBnYXJiYWdlIGZvciB0aGUgZmlyc3QgYXV4IHRyYW5hY3Rpb24gdGhleQpy ZWNlaXZlIHdoZW4gY29taW5nIG91dCBvZiBzbGVlcCBtb2RlLCBzbyB3ZSBuZWVkIHRvIHBlcmZv cm0gYW4gYWRkaXRpb25hbApyZWFkIGJlZm9yZSB0aGUgYWN0dWFsIHJlYWQgdG8gd29ya2Fyb3Vu ZCB0aGlzLgoKCQkJICAgIENoYW5nZXMgc2luY2UgdjUKLSBJZiB0aGUgdGhyb3dhd2F5IHJlYWQg aW4gZHJtX2RwX2RwY2RfcmVhZCgpIGZhaWxzLCByZXR1cm4gdGhlIGVycm9yCiAgZnJvbSB0aGF0 IGluc3RlYWQgb2YgY29udGludWluZy4gVGhpcyBmb2xsb3dzIHRoZSBzYW1lIGxvZ2ljIHdlIGRv IGluCiAgZHJtX2RwX2RwY2RfYWNjZXNzKCkgKGUuZy4gdGhlIGVycm9yIGZyb20gdGhlIGZpcnN0 IHRyYW5zYWN0aW9uIG1heQogIGRpZmZlciBmcm9tIHRoZSBlcnJvcnMgdGhhdCBwcm9jZWVkaW5n IGF0dGVtcHRzIG1pZ2h0IHJldHVybikuCgpTaWduZWQtb2ZmLWJ5OiBMeXVkZSA8Y3BhdWxAcmVk aGF0LmNvbT4KLS0tCiBkcml2ZXJzL2dwdS9kcm0vZHJtX2RwX2hlbHBlci5jIHwgMTIgKysrKysr KysrKysrCiAxIGZpbGUgY2hhbmdlZCwgMTIgaW5zZXJ0aW9ucygrKQoKZGlmZiAtLWdpdCBhL2Ry aXZlcnMvZ3B1L2RybS9kcm1fZHBfaGVscGVyLmMgYi9kcml2ZXJzL2dwdS9kcm0vZHJtX2RwX2hl bHBlci5jCmluZGV4IDU0MGMzZTQuLmFhODA3MDIgMTAwNjQ0Ci0tLSBhL2RyaXZlcnMvZ3B1L2Ry bS9kcm1fZHBfaGVscGVyLmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2RybV9kcF9oZWxwZXIuYwpA QCAtMjQ4LDYgKzI0OCwxOCBAQCB1bmxvY2s6CiBzc2l6ZV90IGRybV9kcF9kcGNkX3JlYWQoc3Ry dWN0IGRybV9kcF9hdXggKmF1eCwgdW5zaWduZWQgaW50IG9mZnNldCwKIAkJCSB2b2lkICpidWZm ZXIsIHNpemVfdCBzaXplKQogeworCWludCByZXQ7CisKKwkvKgorCSAqIFNvbWV0aW1lcyB3ZSBq dXN0IGdldCB0aGUgc2FtZSBpbmNvcnJlY3QgYnl0ZSByZXBlYXRlZCBvdmVyIHRoZQorCSAqIGVu dGlyZSBidWZmZXIuIERvaW5nIG9uZSB0aHJvdyBhd2F5IHJlYWQgaW5pdGlhbGx5IHNlZW1zIHRv ICJzb2x2ZSIKKwkgKiBpdC4KKwkgKi8KKwlyZXQgPSBkcm1fZHBfZHBjZF9hY2Nlc3MoYXV4LCBE UF9BVVhfTkFUSVZFX1JFQUQsIERQX0RQQ0RfUkVWLCBidWZmZXIsCisJCQkJIDEpOworCWlmIChy ZXQgIT0gMSkKKwkJcmV0dXJuIHJldDsKKwogCXJldHVybiBkcm1fZHBfZHBjZF9hY2Nlc3MoYXV4 LCBEUF9BVVhfTkFUSVZFX1JFQUQsIG9mZnNldCwgYnVmZmVyLAogCQkJCSAgc2l6ZSk7CiB9Ci0t IAoyLjUuNQoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K SW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0 dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4Cg==