From 3b077afb3a7d84bffbf6598697a17655933671d2 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Fri, 14 Mar 2014 14:07:50 +0100 Subject: [PATCH] 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: Thierry Reding --- .../bindings/gpu/nvidia,tegra20-host1x.txt | 1 + drivers/gpu/drm/tegra/dsi.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt b/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt index f13a6b8263d3..b48f4ef31d93 100644 --- a/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt +++ b/Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt @@ -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. diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c index 5e2bd843dbe2..fbb13ce1ed18 100644 --- a/drivers/gpu/drm/tegra/dsi.c +++ b/drivers/gpu/drm/tegra/dsi.c @@ -14,6 +14,8 @@ #include #include +#include + #include #include @@ -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);