From patchwork Mon Mar 1 16:07:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 389625 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 327F5C4646B for ; Mon, 1 Mar 2021 18:39:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D779601FC for ; Mon, 1 Mar 2021 18:39:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240378AbhCASiu (ORCPT ); Mon, 1 Mar 2021 13:38:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:48318 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239876AbhCASeS (ORCPT ); Mon, 1 Mar 2021 13:34:18 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4836060200; Mon, 1 Mar 2021 17:46:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614620778; bh=Re+qalLPlqw9GmM+XvYZxgiSgrFuLrMIUItUAZvQM24=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p8y1UjsFO9bDnN5V3iUZkwqSJn6NvS3xTsVOXBQ7SwPDk0K76ccddq89ZgvNkM0L9 zZp3giJqU6CfoHzmfh3akpd1fEgN3nJKYbHPry5+BwXOlpAM3KrBdrNu00DtY4bx6U pGugATworlrKA9DV7scxav0ens2EZfG81keU7/08= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Stevenson , Maxime Ripard , Hans Verkuil , Maarten Lankhorst , Sasha Levin Subject: [PATCH 5.11 277/775] drm/vc4: hdmi: Compute the CEC clock divider from the clock rate Date: Mon, 1 Mar 2021 17:07:25 +0100 Message-Id: <20210301161215.318473079@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Maxime Ripard [ Upstream commit 163a3ef681e5e9d5df558e855d86ccd4708d6200 ] The CEC clock divider needs to output a frequency of 40kHz from the HSM rate on the BCM2835. The driver used to have a fixed frequency for it, but that changed for the BCM2711 and we now need to compute it dynamically to maintain the proper rate. Fixes: cd4cb49dc5bb ("drm/vc4: hdmi: Adjust HSM clock rate depending on pixel rate") Reviewed-by: Dave Stevenson Signed-off-by: Maxime Ripard Acked-by: Hans Verkuil Tested-by: Hans Verkuil Link: https://patchwork.freedesktop.org/patch/msgid/20210111142309.193441-7-maxime@cerno.tech (cherry picked from commit f1ceb9d10043683b89e5e5e5848fb4e855295762) Signed-off-by: Maarten Lankhorst Signed-off-by: Sasha Levin --- drivers/gpu/drm/vc4/vc4_hdmi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index a9a6552bdae93..eff9014750e2d 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1467,6 +1467,7 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi) { struct cec_connector_info conn_info; struct platform_device *pdev = vc4_hdmi->pdev; + u16 clk_cnt; u32 value; int ret; @@ -1492,8 +1493,9 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi) * divider: the hsm_clock rate and this divider setting will * give a 40 kHz CEC clock. */ + clk_cnt = clk_get_rate(vc4_hdmi->hsm_clock) / CEC_CLOCK_FREQ; value |= VC4_HDMI_CEC_ADDR_MASK | - (4091 << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT); + (clk_cnt << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT); HDMI_WRITE(HDMI_CEC_CNTRL_1, value); ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0), vc4_cec_irq_handler,