From patchwork Fri Apr 14 08:31:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Romain Perier X-Patchwork-Id: 9680817 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4AD5E60326 for ; Fri, 14 Apr 2017 08:32:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 44951283FE for ; Fri, 14 Apr 2017 08:32:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 38FC2285EA; Fri, 14 Apr 2017 08:32:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A2EC4283FE for ; Fri, 14 Apr 2017 08:32:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=SJyZJd4xyjdhLtc3T9v/2kT2ObBJYTGdCyE3wDgw85I=; b=IaMHPmvQx5SnBOaB+EQjGi4sJE qlZsixLWKn77G3kYFFch/dP1nPOgJQJVXosYu4I8HVMd7sRSgTcxZdZjsqmOfX9eM0yMTxcRbbY1k nHr4IcbcV6HkajDmmELw2Ol1xKrBDesAhdZnQcdL5IxuKW554mt2GA3CskO0jZ0Tq/wlyGtL13nB4 y+J3jmUdU38G/1kHQSQYgjfyL9GXYSVaHsAjTKtSbTcfU134+YWZZ+fhQ5GmWhbHlTeNwJAHm79FP ryBvvzhWGWzMHvCyl4QpvUj2gAzUR+ieJhWk2ACE4i1SKVkc02PlWNyjj6ce6NR8b+oXpeoEh6KTq LA1zRacQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cyweR-0007gu-Sv; Fri, 14 Apr 2017 08:32:19 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cywdu-00072m-2y; Fri, 14 Apr 2017 08:31:48 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: rperier) with ESMTPSA id 8E31F267A4B From: Romain Perier To: Archit Taneja , David Airlie Subject: [PATCH v2 2/2] drm: dw-hdmi: gate audio clock from the I2S enablement callbacks Date: Fri, 14 Apr 2017 10:31:13 +0200 Message-Id: <20170414083113.4255-3-romain.perier@collabora.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170414083113.4255-1-romain.perier@collabora.com> References: <20170414083113.4255-1-romain.perier@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170414_013146_302018_571DE24A X-CRM114-Status: GOOD ( 10.15 ) 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: Jose Abreu , Neil Armstrong , Russell King , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Romain Perier , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, the audio sampler clock is enabled from dw_hdmi_setup() at step E. and is kept enabled for later use. This clock should be enabled and disabled along with the actual audio stream and not always on (that is bad for PM). Futhermore, as described by the datasheet, the I2S variant need to gate/ungate the clock when the stream is enabled/disabled. This commit adds a parameter to hdmi_audio_enable_clk() that controls when the audio sample clock must be enabled or disabled. Then, it adds the call to this function from dw_hdmi_i2s_audio_enable() and dw_hdmi_i2s_audio_disable(). Signed-off-by: Romain Perier Reviewed-by: Neil Armstrong --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 5b328c0..a6da634 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -544,6 +544,12 @@ void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate) } EXPORT_SYMBOL_GPL(dw_hdmi_set_sample_rate); +static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi, bool enable) +{ + hdmi_modb(hdmi, enable ? 0 : HDMI_MC_CLKDIS_AUDCLK_DISABLE, + HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS); +} + void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi) { hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n); @@ -557,6 +563,12 @@ void dw_hdmi_ahb_audio_disable(struct dw_hdmi *hdmi) void dw_hdmi_i2s_audio_enable(struct dw_hdmi *hdmi) { hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n); + hdmi_enable_audio_clk(hdmi, true); +} + +void dw_hdmi_i2s_audio_disable(struct dw_hdmi *hdmi) +{ + hdmi_enable_audio_clk(hdmi, false); } void dw_hdmi_audio_enable(struct dw_hdmi *hdmi) @@ -1592,11 +1604,6 @@ static void dw_hdmi_enable_video_path(struct dw_hdmi *hdmi) HDMI_MC_FLOWCTRL); } -static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi) -{ - hdmi_modb(hdmi, 0, HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS); -} - /* Workaround to clear the overflow condition */ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi) { @@ -1710,7 +1717,7 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode) /* HDMI Initialization Step E - Configure audio */ hdmi_clk_regenerator_update_pixel_clock(hdmi); - hdmi_enable_audio_clk(hdmi); + hdmi_enable_audio_clk(hdmi, true); } /* not for DVI mode */ @@ -2438,6 +2445,7 @@ __dw_hdmi_probe(struct platform_device *pdev, audio.write = hdmi_writeb; audio.read = hdmi_readb; hdmi->enable_audio = dw_hdmi_i2s_audio_enable; + hdmi->disable_audio = dw_hdmi_i2s_audio_disable; pdevinfo.name = "dw-hdmi-i2s-audio"; pdevinfo.data = &audio;