From: Romain Perier <romain.perier@collabora.com>
To: Archit Taneja <architt@codeaurora.org>, David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org,
linux-rockchip@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Jose Abreu <Jose.Abreu@synopsys.com>,
Russell King <linux@armlinux.org.uk>,
Neil Armstrong <narmstrong@baylibre.com>
Subject: Re: [PATCH v2 2/2] drm: dw-hdmi: gate audio clock from the I2S enablement callbacks
Date: Mon, 24 Apr 2017 08:44:34 +0200 [thread overview]
Message-ID: <eeb069cf-1dba-91c4-c30b-bb37403e3b3b@collabora.com> (raw)
In-Reply-To: <c9258563-afcd-4088-a4f4-6a4e056f5d36@codeaurora.org>
Hello,
Le 19/04/2017 à 06:51, Archit Taneja a écrit :
>
>
> On 04/14/2017 02:01 PM, Romain Perier wrote:
>> 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
>
> s/Futhermore/Furthermore
>
>> variant need to gate/ungate the clock when the stream is
>
> s/need/needs
>
>> 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 <romain.perier@collabora.com>
>> ---
>> 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);
>> }
>
> This should be static too.
>
> If you're okay with the suggestions, I can fix these myself and push. Let
> me know if that's okay.
>
> Thanks,
> Archit
>
Yes, I completely agree.
Thanks,
Romain
prev parent reply other threads:[~2017-04-24 6:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-14 8:31 [PATCH v2 0/2] drm: dw-hdmi: various improvements Romain Perier
2017-04-14 8:31 ` [PATCH v2 1/2] drm: dw-hdmi: add specific I2S and AHB functions for stream handling Romain Perier
2017-04-14 9:05 ` Neil Armstrong
2017-04-19 4:49 ` Archit Taneja
2017-04-14 8:31 ` [PATCH v2 2/2] drm: dw-hdmi: gate audio clock from the I2S enablement callbacks Romain Perier
2017-04-14 9:06 ` Neil Armstrong
2017-04-19 4:51 ` Archit Taneja
2017-04-20 9:39 ` Archit Taneja
2017-04-24 6:55 ` Romain Perier
2017-04-24 6:44 ` Romain Perier [this message]
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