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Commit 3b077afb authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: dsi - Implement VDD supply support 



The DSI controllers are powered by a (typically 1.2V) regulator. Usually
this is always on, so there was no need to support enabling or disabling
it thus far. But in order not to consume any power when DSI is inactive,
give the driver a chance to enable or disable the supply as needed.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent bcfc7acb

Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt

+1 −0
Original line number Diff line number Diff line
@@ -181,6 +181,7 @@ of the following host1x client modules: 
    See ../reset/reset.txt for details.

  - reset-names: Must include the following entries:

    - dsi

  - avdd-dsi-supply: phandle of a supply that powers the DSI controller

  - nvidia,mipi-calibrate: Should contain a phandle and a specifier specifying

    which pads are used by this DSI output and need to be calibrated. See also

    ../mipi/nvidia,tegra114-mipi.txt.

drivers/gpu/drm/tegra/dsi.c

+17 −0
Original line number Diff line number Diff line
@@ -14,6 +14,8 @@ 
#include <linux/platform_device.h>

#include <linux/reset.h>



#include <linux/regulator/consumer.h>



#include <drm/drm_mipi_dsi.h>

#include <drm/drm_panel.h>
@@ -48,6 +50,8 @@ struct tegra_dsi { 


	struct tegra_mipi_device *mipi;

	struct mipi_dsi_host host;



	struct regulator *vdd;

};



static inline struct tegra_dsi *
@@ -821,6 +825,18 @@ static int tegra_dsi_probe(struct platform_device *pdev) 
		return err;

	}



	dsi->vdd = devm_regulator_get(&pdev->dev, "avdd-dsi-csi");

	if (IS_ERR(dsi->vdd)) {

		dev_err(&pdev->dev, "cannot get VDD supply\n");

		return PTR_ERR(dsi->vdd);

	}



	err = regulator_enable(dsi->vdd);

	if (err < 0) {

		dev_err(&pdev->dev, "cannot enable VDD supply\n");

		return err;

	}



	err = tegra_dsi_setup_clocks(dsi);

	if (err < 0) {

		dev_err(&pdev->dev, "cannot setup clocks\n");
@@ -876,6 +892,7 @@ static int tegra_dsi_remove(struct platform_device *pdev) 
	mipi_dsi_host_unregister(&dsi->host);

	tegra_mipi_free(dsi->mipi);



	regulator_disable(dsi->vdd);

	clk_disable_unprepare(dsi->clk_parent);

	clk_disable_unprepare(dsi->clk_lp);

	clk_disable_unprepare(dsi->clk);