linux-kernel - Re: [PATCH v3 5/5] drm/rockchip/dsi: add dw-mipi power domain support

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Message-ID: <20170123180301.GC25789@trickycodes.roam.corp.google.com>
Date:   Mon, 23 Jan 2017 13:03:01 -0500
From:   Sean Paul <seanpaul@...omium.org>
To:     Chris Zhong <zyw@...k-chips.com>
Cc:     dianders@...omium.org, tfiga@...omium.org, heiko@...ech.de,
        yzq@...k-chips.com, mark.rutland@....com,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        galak@...eaurora.org, pawel.moll@....com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/5] drm/rockchip/dsi: add dw-mipi power domain support

On Fri, Jan 20, 2017 at 06:10:51PM +0800, Chris Zhong wrote:
> Reference the power domain incase dw-mipi power down when
> in use.
> 

Reviewed-by: Sean Paul <seanpaul@...omium.org>

> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
> ---
> 
> Changes in v3: None
> 
>  drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 6f0e252..1462101e 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -12,6 +12,7 @@
>  #include <linux/math64.h>
>  #include <linux/module.h>
>  #include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
>  #include <linux/mfd/syscon.h>
> @@ -293,6 +294,7 @@ struct dw_mipi_dsi {
>  	struct clk *pclk;
>  	struct clk *phy_cfg_clk;
>  
> +	int dpms_mode;
>  	unsigned int lane_mbps; /* per lane */
>  	u32 channel;
>  	u32 lanes;
> @@ -969,6 +971,9 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
>  {
>  	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>  
> +	if (dsi->dpms_mode != DRM_MODE_DPMS_ON)
> +		return;
> +
>  	if (clk_prepare_enable(dsi->pclk)) {
>  		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
>  		return;
> @@ -980,7 +985,9 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
>  	drm_panel_unprepare(dsi->panel);
>  
>  	dw_mipi_dsi_disable(dsi);
> +	pm_runtime_put(dsi->dev);
>  	clk_disable_unprepare(dsi->pclk);
> +	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
>  }
>  
>  static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
> @@ -990,11 +997,15 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
>  	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
>  	u32 val;
>  
> +	if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
> +		return;
> +
>  	if (clk_prepare_enable(dsi->pclk)) {
>  		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
>  		return;
>  	}
>  
> +	pm_runtime_get_sync(dsi->dev);
>  	dw_mipi_dsi_init(dsi);
>  	dw_mipi_dsi_dpi_config(dsi);
>  	dw_mipi_dsi_packet_handler_config(dsi);
> @@ -1030,6 +1041,7 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
>  
>  	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
>  	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
> +	dsi->dpms_mode = DRM_MODE_DPMS_ON;
>  }
>  
>  static int
> @@ -1198,6 +1210,7 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>  
>  	dsi->dev = dev;
>  	dsi->pdata = pdata;
> +	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
>  
>  	ret = rockchip_mipi_parse_dt(dsi);
>  	if (ret)
> @@ -1271,6 +1284,8 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>  
>  	dev_set_drvdata(dev, dsi);
>  
> +	pm_runtime_enable(dev);
> +
>  	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>  	dsi->dsi_host.dev = dev;
>  	ret = mipi_dsi_host_register(&dsi->dsi_host);
> @@ -1293,6 +1308,7 @@ static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
>  	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
>  
>  	mipi_dsi_host_unregister(&dsi->dsi_host);
> +	pm_runtime_disable(dev);
>  	clk_disable_unprepare(dsi->pllref_clk);
>  }
>  
> -- 
> 2.6.3
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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