Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755723AbdGXHVe (ORCPT ); Mon, 24 Jul 2017 03:21:34 -0400 Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:40791 "EHLO metis.ext.4.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753053AbdGXHVM (ORCPT ); Mon, 24 Jul 2017 03:21:12 -0400 Message-ID: <1500880868.2391.14.camel@pengutronix.de> Subject: Re: [PATCH] media: imx: prpencvf: enable double write reduction From: Philipp Zabel To: Steve Longerbeam Cc: Mauro Carvalho Chehab , Greg Kroah-Hartman , linux-media@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Steve Longerbeam Date: Mon, 24 Jul 2017 09:21:08 +0200 In-Reply-To: <1500758501-5394-1-git-send-email-steve_longerbeam@mentor.com> References: <1500758501-5394-1-git-send-email-steve_longerbeam@mentor.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.9-1+b1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2001:67c:670:100:3ad5:47ff:feaf:1a17 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 405 Lines: 11 On Sat, 2017-07-22 at 14:21 -0700, Steve Longerbeam wrote: > For the write channels with 4:2:0 subsampled YUV formats, avoid chroma > overdraw by only writing chroma for even lines. Reduces necessary write > memory bandwidth by at least 25% (more with rotation enabled). > > Signed-off-by: Steve Longerbeam Acked-by: Philipp Zabel regards Philipp