From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14739C4CECD for ; Mon, 16 Sep 2019 10:40:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD980214D9 for ; Mon, 16 Sep 2019 10:40:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=onstation.org header.i=@onstation.org header.b="ZCbe4Dvg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727071AbfIPKkH (ORCPT ); Mon, 16 Sep 2019 06:40:07 -0400 Received: from onstation.org ([52.200.56.107]:40854 "EHLO onstation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726055AbfIPKkH (ORCPT ); Mon, 16 Sep 2019 06:40:07 -0400 Received: from localhost (c-98-239-145-235.hsd1.wv.comcast.net [98.239.145.235]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: masneyb) by onstation.org (Postfix) with ESMTPSA id BA7C13E8F9; Mon, 16 Sep 2019 10:40:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=onstation.org; s=default; t=1568630406; bh=wtwhbwzLFX1hOxjHI6Km7YJYGl4UdbLbrZnDLLvMrxY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZCbe4Dvg00xGUQPAJF2/aulQkpQnoxQ9lj5hlCcH+yDvWz62utM+p5k/NFiRgU5g7 ejeE3yaBaSO72f5dG0dLexNQgj3mUW/ZcK9AIHSwI0LwXFUiGBSvVZMgPYYx4dpRRy Q2xqU7xpuIY37lxivUDxElfp7rj2ouOFcdwdZimc= Date: Mon, 16 Sep 2019 06:40:04 -0400 From: Brian Masney To: Enric Balletbo i Serra Cc: Andrzej Hajda , bjorn.andersson@linaro.org, robh+dt@kernel.org, agross@kernel.org, narmstrong@baylibre.com, robdclark@gmail.com, sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch, mark.rutland@arm.com, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@siol.net, linus.walleij@linaro.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, freedreno@lists.freedesktop.org Subject: Re: [PATCH 05/11] drm/bridge: analogix-anx78xx: correct value of TX_P0 Message-ID: <20190916104004.GB1644@onstation.org> References: <20190815004854.19860-1-masneyb@onstation.org> <20190815004854.19860-6-masneyb@onstation.org> <98199a9b-f7e0-ef95-62d7-401273457692@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <98199a9b-f7e0-ef95-62d7-401273457692@collabora.com> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Mon, Sep 16, 2019 at 12:36:19PM +0200, Enric Balletbo i Serra wrote: > Hi Andrzej and Brian > > On 16/9/19 12:02, Andrzej Hajda wrote: > > On 15.08.2019 02:48, Brian Masney wrote: > >> When attempting to configure this driver on a Nexus 5 phone (msm8974), > >> setting up the dummy i2c bus for TX_P0 would fail due to an -EBUSY > >> error. The downstream MSM kernel sources [1] shows that the proper value > >> for TX_P0 is 0x78, not 0x70, so correct the value to allow device > >> probing to succeed. > >> > >> [1] https://github.com/AICP/kernel_lge_hammerhead/blob/n7.1/drivers/video/slimport/slimport_tx_reg.h > >> > >> Signed-off-by: Brian Masney > >> --- > >> drivers/gpu/drm/bridge/analogix-anx78xx.h | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > >> > >> diff --git a/drivers/gpu/drm/bridge/analogix-anx78xx.h b/drivers/gpu/drm/bridge/analogix-anx78xx.h > >> index 25e063bcecbc..bc511fc605c9 100644 > >> --- a/drivers/gpu/drm/bridge/analogix-anx78xx.h > >> +++ b/drivers/gpu/drm/bridge/analogix-anx78xx.h > >> @@ -6,7 +6,7 @@ > >> #ifndef __ANX78xx_H > >> #define __ANX78xx_H > >> > >> -#define TX_P0 0x70 > >> +#define TX_P0 0x78 > > > > > > This bothers me little. There are no upstream users, grepping android > > sources suggests that both values can be used [1][2]  (grep for "#define > > TX_P0"), moreover there is code suggesting both values can be valid [3]. > > > > Could you verify datasheet which i2c slave addresses are valid for this > > chip, if both I guess this patch should be reworked. > > > > On my case the valid i2c slave address is 0x70 (from datasheet, very sorry I > can't share it) and the bridge used is an ANX7814, it could be that ANX7808 or > ANX7812 have different slave addresses? I haven't been able to find any of the datasheets for these devices online. Product briefs are online (such as https://www.analogix.com/en/system/files/ANX7808_product_brief.pdf), but they don't provide this type of information. Brian