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Received: from relay2-d.mail.gandi.net ([217.70.183.194]) by casper.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1guDF4-0002c9-AL for linux-arm-kernel@lists.infradead.org; Thu, 14 Feb 2019 09:23:40 +0000 X-Originating-IP: 90.88.30.68 Received: from localhost (aaubervilliers-681-1-89-68.w90-88.abo.wanadoo.fr [90.88.30.68]) (Authenticated sender: maxime.ripard@bootlin.com) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id 8162D40004; Thu, 14 Feb 2019 09:23:00 +0000 (UTC) Date: Thu, 14 Feb 2019 10:23:00 +0100 From: Maxime Ripard To: Paul Kocialkowski Subject: Re: [PATCH v3 5/8] drm/sun4i: dsi: Fix DRQ calculation Message-ID: <20190214092300.nb7cj7cr6rzyvjlo@flea> References: MIME-Version: 1.0 In-Reply-To: User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190214_092338_402190_73029E7B X-CRM114-Status: GOOD ( 17.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bbrezillon@kernel.org, Maarten Lankhorst , dri-devel@lists.freedesktop.org, Chen-Yu Tsai , Sean Paul , Thomas Petazzoni , Jagan Teki , linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="===============8598925807192026891==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============8598925807192026891== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="r3umqet5qhxxxeta" Content-Disposition: inline --r3umqet5qhxxxeta Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Feb 13, 2019 at 03:33:38PM +0100, Paul Kocialkowski wrote: > Hi, >=20 > On Mon, 2019-02-11 at 15:41 +0100, Maxime Ripard wrote: > > The DRQ calculation code in the Allwinner BSP uses the vertical front > > porch value as the condition, but we're using the video back porch. > >=20 > > Since I always confuse the two, and I'm the original author of that cod= e, I > > guess I deserved a brown paper bag. > >=20 > > Signed-off-by: Maxime Ripard >=20 > Assuming that the BSP's hbp is referring to the back porch only, then > calculating ht - x - hbp does give us the front porch + hsync length. >=20 > Well, let's guess that this about the front porch only until we know > better. It's certainly better than using the back porch anyway :) After discussing it with Paul, we decided to drop that patch since it would make the backporch definition inconsistent in the driver. Maxime --=20 Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --r3umqet5qhxxxeta Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXGUzdAAKCRDj7w1vZxhR xa0fAP4jJ+lUOlun17orkb3xW8mVTcX8yPsY/A9kle5oElJgxwEAjEplHMI8orL4 e9LGoTF0IZeKNRdY7N9YpzJsjTORlAU= =xldS -----END PGP SIGNATURE----- --r3umqet5qhxxxeta-- --===============8598925807192026891== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============8598925807192026891==--