From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowjanya Komatineni Subject: RE: [PATCH V2 3/4] i2c: tegra: Add DMA Support Date: Sat, 26 Jan 2019 01:51:59 +0000 Message-ID: References: <1548363113-25969-1-git-send-email-skomatineni@nvidia.com> <1548363113-25969-3-git-send-email-skomatineni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: Dmitry Osipenko , "thierry.reding@gmail.com" , Jonathan Hunter , Mantravadi Karthik , Shardar Mohammed , Timo Alho Cc: "linux-tegra@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-i2c@vger.kernel.org" List-Id: linux-tegra@vger.kernel.org PiA+ICtzdGF0aWMgaW50IHRlZ3JhX2kyY19pbml0X2RtYV9wYXJhbShzdHJ1Y3QgdGVncmFfaTJj X2RldiAqaTJjX2RldiwNCj4gPiArCQkJCSAgICBib29sIGRtYV90b19tZW1vcnkpDQo+ID4gK3sN Cj4gPiArCXN0cnVjdCBkbWFfY2hhbiAqZG1hX2NoYW47DQo+ID4gKwl1MzIgKmRtYV9idWY7DQo+ ID4gKwlkbWFfYWRkcl90IGRtYV9waHlzOw0KPiA+ICsJaW50IHJldDsNCj4gPiArCWNvbnN0IGNo YXIgKmNoYW5fbmFtZSA9IGRtYV90b19tZW1vcnkgPyAicngiIDogInR4IjsNCj4gPiArDQo+ID4g KwlkbWFfY2hhbiA9IGRtYV9yZXF1ZXN0X3NsYXZlX2NoYW5uZWxfcmVhc29uKGkyY19kZXYtPmRl diwgY2hhbl9uYW1lKTsNCj4gPiArCWlmIChJU19FUlIoZG1hX2NoYW4pKQ0KPiA+ICsJCXJldHVy biBQVFJfRVJSKGRtYV9jaGFuKTsNCj4NCj4gSGVyZSBzaGFsbCBiZSBhIGNoZWNrIG9mIHdoZXRo ZXIgZG1hX2J1ZiBpcyBhbHJlYWR5IGFsbG9jYXRlZCwgb3RoZXJ3aXNlIGl0IHdpbGwgYmUgYWxs b2NhdGVkIHR3aWNlIGFuZCB0aGUgZmlyc3QgYWxsb2NhdGlvbiB0dXJuZWQgaW50byBtZW1sZWFr Og0KPg0KPglpZiAoaTJjX2Rldi0+ZG1hX2J1ZikNCj4JCXJldHVybiAwOw0KDQpJZiBkbWFfYnVm IGlzIGFsbG9jYXRlZCBhbHJlYWR5IHRoZW4gZG1hIGNoYW5uZWxzIHdpbGwgYmUgYXNzaWduZWQg YW5kIGl0IHdpbGwgbm90IHBlcmZvcm0gaW5pdCBkbWEgYWdhaW4uDQpTbyBpZiBkbWEgYnVmIGFs bG9jYXRpb24gaGFwcGVucyBhbHJlYWR5IHRoZW4gaXQgd2lsbCBub3QgY29tZSBoZXJlIGFnYWlu Lg0KDQo+ID4gKw0KPiA+ICsJZG1hX2J1ZiA9IGRtYV9hbGxvY19jb2hlcmVudChpMmNfZGV2LT5k ZXYsIGkyY19kZXYtPmRtYV9idWZfc2l6ZSwNCj4gPiArCQkJCSAgICAgJmRtYV9waHlzLCBHRlBf S0VSTkVMKTsNCj4gPiArDQo+DQo+IEknbSB3b25kZXJpbmcgd2hldGhlciBhIHdyaXRlLWNvbWJp bmVkIERNQSBtYXBwaW5nIHdpbGwgYmUgbW9yZSBvcHRpbWFsIHRoYW4gaGF2aW5nIEwyIGZsdXNo ZXMgLyBpbnZhbGlkYXRpb24gZm9yIHRoZSAiY29oZXJlbnQiIGFsbG9jYXRpb25zLiANCj4NCj4g QW5kIEknbSBub3cgcXVlc3Rpb25pbmcgd2hldGhlciB0aGVyZSBpcyBhbnkgcmVhbCBiZW5lZml0 IGZyb20gdGhlIERNQSB0cmFuc2ZlcnJpbmcgYXQgYWxsLCBnaXZlbiB0aGUgRE1BIGJvdW5jZS1i dWZmZXIgQ1BVIHJlYWQvd3JpdGUgb3ZlcmhlYWQuIEl0IGxvb2tzIHRvIG1lIHRoYXQgdGhlIHdo b2xlIHB1cnBvc2Ugb2YgdGhlIEkyQyBETUEgdHJhbnNmZXJyaW5nIGlzIHRvIG1vdmUgZGF0YSBm cm9tICh0bykgc29tZSBJMkMgZGV2aWNlIHRvIGEgPiA+IHNvbWUgZGV2aWNlIG9uIHRoZSBBUEIg YnVzLCBieXBhc3NpbmcgdGhlIENQVS4gSWYgdGhhdCdzIGlzIHRoZSBjYXNlLCB0aGVuIHRoaXMg cGF0Y2ggbWF5IG5vdCByZWFsbHkgd29ydGggdGhlIGVmZm9ydCBhbmQgaW5zdGVhZCBjb3VsZCBv bmx5IGh1cnQgdGhlIHRyYW5zZmVycmluZyBwZXJmb3JtYW5jZS4gUGxlYXNlIHByb3ZpZGUgc29t ZSBwZXJmb3JtYW5jZSByZXN1bHRzIG9yIGNvcnJlY3QgbWUgaWYgSSdtIHdyb25nLg0KPg0KPiBb c25pcF0NCg0KRE1BIHRyYW5zZmVyIGhlbHBzIHRvIHJlZHVjZSBvdmVyaGVhZCBvbmx5IGR1cmlu ZyBsYXJnZSB0cmFuc2ZlciB3aGljaCBpcyB2ZXJ5IHJhcmUgb3BlcmF0aW9uLiBXaWxsIGNoZWNr IGFuZCBwcm92aWRlIHNvbWUgcGVyZm9ybWFuY2UgZGF0YS4uLg0KDQo+ID4gIA0KPiA+ICAJaWYg KCFpMmNfZGV2LT5ody0+aGFzX3NpbmdsZV9jbGtfc291cmNlKSB7DQo+ID4gIAkJZmFzdF9jbGsg PSBkZXZtX2Nsa19nZXQoJnBkZXYtPmRldiwgImZhc3QtY2xrIik7IEBAIC0xMDc5LDYgDQo+ID4g KzE0MDIsMTUgQEAgc3RhdGljIGludCB0ZWdyYV9pMmNfcHJvYmUoc3RydWN0IHBsYXRmb3JtX2Rl dmljZSAqcGRldikNCj4gPiAgCQl9DQo+ID4gIAl9DQo+ID4gIA0KPiA+ICsJaWYgKGkyY19kZXYt Pmhhc19kbWEpIHsNCj4gPiArCQlyZXQgPSB0ZWdyYV9pMmNfaW5pdF9kbWFfcGFyYW0oaTJjX2Rl diwgdHJ1ZSk7DQo+ID4gKwkJaWYgKHJldCA9PSAtRVBST0JFX0RFRkVSKQ0KPiA+ICsJCQlnb3Rv IGRpc2FibGVfZGl2X2NsazsNCj4gPiArCQlyZXQgPSB0ZWdyYV9pMmNfaW5pdF9kbWFfcGFyYW0o aTJjX2RldiwgZmFsc2UpOw0KPiA+ICsJCWlmIChyZXQgPT0gLUVQUk9CRV9ERUZFUikNCj4gPiAr CQkJZ290byBkaXNhYmxlX2Rpdl9jbGs7DQo+DQo+IE1pc3NpbmcgZG1hX2J1ZiBmcmVlaW5nIGFu ZCBjaGFubmVsIHJlbGVhc2luZyBpbiBhIGNhc2Ugb2YgZXJyb3IuDQoNCmRtYSBidWYgZnJlZWlu ZyBhbmQgY2hhbm5lbCByZWxlYXNlIGhhcHBlbnMgaW5zaWRlIGluaXRfZG1hIHdoZW4gYnVmZmVy IGFsbG9jYXRpb24gZmFpbHMuDQpJZiBkbWFfcmVxdWVzdF9zbGF2ZV9jaGFubmVsX3JlYXNvbiBm YWlscyBubyBuZWVkIHRvIHJlbGVhc2UgY2hhbm5lbCBidXQgaWYgY2hhbm5lbCByZXF1ZXN0IHN1 Y2NlZWRzIGFuZCBidWZmZXIgYWxsb2NhdGlvbiBmYWlscywgdGhlbiBidWZmZXIgZnJlZSBhbmQg Y2hhbm5lbCByZWxlYXNlIHdpbGwgaGFwcGVuLg0KDQo+ID4gKwl9DQo+ID4gKw0KPiA+ICAJcmV0 ID0gdGVncmFfaTJjX2luaXQoaTJjX2Rldik7DQo+ID4gIAlpZiAocmV0KSB7DQo+ID4gIAkJZGV2 X2VycigmcGRldi0+ZGV2LCAiRmFpbGVkIHRvIGluaXRpYWxpemUgaTJjIGNvbnRyb2xsZXJcbiIp Ow0KPiA+IA0KDQo=