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@xxxxxxxxxxxx>
> Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> ---
>
> 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
>
> _______________________________________________
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Sean Paul, Software Engineer, Google / Chromium OS
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