From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 2 Nov 2017 00:25:44 -0700 From: Stephen Boyd To: =?iso-8859-1?Q?S=E9bastien?= Szymanski Cc: linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Michael Turquette , Fabio Estevam , Sascha Hauer , Shawn Guo , Julien Boibessot , Nicolas Colombain , Fabien Marteau Subject: Re: [PATCH 1/1] clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU Message-ID: <20171102072544.GP30645@codeaurora.org> References: <1501584007-12433-1-git-send-email-sebastien.szymanski@armadeus.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <1501584007-12433-1-git-send-email-sebastien.szymanski@armadeus.com> List-ID: On 08/01, Sébastien Szymanski wrote: > On i.MX6 SoCs without VPU (in my case MCIMX6D4AVT10AC), the hdmi driver > fails to probe: > > [ 2.540030] dwhdmi-imx 120000.hdmi: Unsupported HDMI controller > (0000:00:00) > [ 2.548199] imx-drm display-subsystem: failed to bind 120000.hdmi > (ops dw_hdmi_imx_ops): -19 > [ 2.557403] imx-drm display-subsystem: master bind failed: -19 > > That's because hdmi_isfr's parent, video_27m, is not correctly ungated. > As explained in commit 5ccc248cc537 ("ARM: imx6q: clk: Add support for > mipi_core_cfg clock as a shared clock gate"), video_27m is gated by > CCM_CCGR3[CG8]. > > On i.MX6 SoCs with VPU, the hdmi is working thanks to the > CCM_CMEOR[mod_en_ov_vpu] bit which makes the video_27m ungated whatever > is in CCM_CCGR3[CG8]. The issue can be reproduced by setting > CCMEOR[mod_en_ov_vpu] to 0. > > Make the HDMI work in every case by setting hdmi_isfr's parent to > mipi_core_cfg. > > Signed-off-by: Sébastien Szymanski > --- Applied to clk-next -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project