linux-kernel - Re: [PATCH v4 17/27] drm/bridge: ti-sn65dsi86: Use pm

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Date:   Fri, 23 Apr 2021 09:51:28 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>, Wolfram Sang <wsa@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, robdclark@...omium.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        Steev Klimaszewski <steev@...i.org>,
        linux-arm-msm@...r.kernel.org, Linus W <linus.walleij@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 17/27] drm/bridge: ti-sn65dsi86: Use pm_runtime
 autosuspend

On Fri 16 Apr 17:39 CDT 2021, Douglas Anderson wrote:

> Let's make the bridge use autosuspend with a 500ms delay. This is in
> preparation for promoting DP AUX transfers to their own sub-driver so
> that we're not constantly powering up and down the device as we
> transfer all the chunks.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index 44edcf6f5744..a98abf496190 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -243,7 +243,7 @@ static int status_show(struct seq_file *s, void *data)
>  		seq_printf(s, "[0x%02x] = 0x%08x\n", reg, val);
>  	}
>  
> -	pm_runtime_put(pdata->dev);
> +	pm_runtime_put_autosuspend(pdata->dev);
>  
>  	return 0;
>  }
> @@ -292,7 +292,7 @@ static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
>  	if (!edid) {
>  		pm_runtime_get_sync(pdata->dev);
>  		edid = pdata->edid = drm_get_edid(connector, &pdata->aux.ddc);
> -		pm_runtime_put(pdata->dev);
> +		pm_runtime_put_autosuspend(pdata->dev);
>  	}
>  
>  	if (edid && drm_edid_is_valid(edid)) {
> @@ -418,7 +418,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
>  	/* check if continuous dsi clock is required or not */
>  	pm_runtime_get_sync(pdata->dev);
>  	regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
> -	pm_runtime_put(pdata->dev);
> +	pm_runtime_put_autosuspend(pdata->dev);
>  	if (!(val & DPPLL_CLK_SRC_DSICLK))
>  		dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
>  
> @@ -1049,7 +1049,7 @@ static int ti_sn_bridge_gpio_get(struct gpio_chip *chip, unsigned int offset)
>  	 */
>  	pm_runtime_get_sync(pdata->dev);
>  	ret = regmap_read(pdata->regmap, SN_GPIO_IO_REG, &val);
> -	pm_runtime_put(pdata->dev);
> +	pm_runtime_put_autosuspend(pdata->dev);
>  
>  	if (ret)
>  		return ret;
> @@ -1100,7 +1100,7 @@ static int ti_sn_bridge_gpio_direction_input(struct gpio_chip *chip,
>  	 * it off and when it comes back it will have lost all state, but
>  	 * that's OK because the default is input and we're now an input.
>  	 */
> -	pm_runtime_put(pdata->dev);
> +	pm_runtime_put_autosuspend(pdata->dev);
>  
>  	return 0;
>  }
> @@ -1126,7 +1126,7 @@ static int ti_sn_bridge_gpio_direction_output(struct gpio_chip *chip,
>  				 SN_GPIO_MUX_OUTPUT << shift);
>  	if (ret) {
>  		clear_bit(offset, pdata->gchip_output);
> -		pm_runtime_put(pdata->dev);
> +		pm_runtime_put_autosuspend(pdata->dev);
>  	}
>  
>  	return ret;
> @@ -1408,6 +1408,8 @@ static int ti_sn65dsi86_probe(struct i2c_client *client,
>  	ret = devm_add_action_or_reset(dev, ti_sn65dsi86_runtime_disable, dev);
>  	if (ret)
>  		return ret;
> +	pm_runtime_set_autosuspend_delay(pdata->dev, 500);
> +	pm_runtime_use_autosuspend(pdata->dev);
>  
>  	ti_sn65dsi86_debugfs_init(pdata);
>  
> -- 
> 2.31.1.368.gbe11c130af-goog
>