cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/msm/hdmi/hdmi_phy.c

/*
 * Copyright (c) 2016, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/of_device.h>

#include "hdmi.h"


static int msm_hdmi_phy_resource_init(struct hdmi_phy *phy) { struct hdmi_phy_cfg *cfg = phy->cfg; struct device *dev = &phy->pdev->dev; int i, ret; phy->regs = devm_kzalloc(dev, sizeof(phy->regs[0]) * cfg->num_regs, GFP_KERNEL); if (!phy->regs) return -ENOMEM; phy->clks = devm_kzalloc(dev, sizeof(phy->clks[0]) * cfg->num_clks, GFP_KERNEL); if (!phy->clks) return -ENOMEM; for (i = 0; i < cfg->num_regs; i++) { struct regulator *reg; reg = devm_regulator_get(dev, cfg->reg_names[i]); if (IS_ERR(reg)) { ret = PTR_ERR(reg); dev_err(dev, "failed to get phy regulator: %s (%d)\n", cfg->reg_names[i], ret); return ret; } phy->regs[i] = reg; } for (i = 0; i < cfg->num_clks; i++) { struct clk *clk; clk = devm_clk_get(dev, cfg->clk_names[i]); if (IS_ERR(clk)) { ret = PTR_ERR(clk); dev_err(dev, "failed to get phy clock: %s (%d)\n", cfg->clk_names[i], ret); return ret; } phy->clks[i] = clk; } return 0; }

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int msm_hdmi_phy_resource_enable(struct hdmi_phy *phy) { struct hdmi_phy_cfg *cfg = phy->cfg; struct device *dev = &phy->pdev->dev; int i, ret = 0; pm_runtime_get_sync(dev); for (i = 0; i < cfg->num_regs; i++) { ret = regulator_enable(phy->regs[i]); if (ret) dev_err(dev, "failed to enable regulator: %s (%d)\n", cfg->reg_names[i], ret); } for (i = 0; i < cfg->num_clks; i++) { ret = clk_prepare_enable(phy->clks[i]); if (ret) dev_err(dev, "failed to enable clock: %s (%d)\n", cfg->clk_names[i], ret); } return ret; }

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void msm_hdmi_phy_resource_disable(struct hdmi_phy *phy) { struct hdmi_phy_cfg *cfg = phy->cfg; struct device *dev = &phy->pdev->dev; int i; for (i = cfg->num_clks - 1; i >= 0; i--) clk_disable_unprepare(phy->clks[i]); for (i = cfg->num_regs - 1; i >= 0; i--) regulator_disable(phy->regs[i]); pm_runtime_put_sync(dev); }

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void msm_hdmi_phy_powerup(struct hdmi_phy *phy, unsigned long int pixclock) { if (!phy || !phy->cfg->powerup) return; phy->cfg->powerup(phy, pixclock); }

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void msm_hdmi_phy_powerdown(struct hdmi_phy *phy) { if (!phy || !phy->cfg->powerdown) return; phy->cfg->powerdown(phy); }

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static int msm_hdmi_phy_pll_init(struct platform_device *pdev, enum hdmi_phy_type type) { int ret; switch (type) { case MSM_HDMI_PHY_8960: ret = msm_hdmi_pll_8960_init(pdev); break; case MSM_HDMI_PHY_8996: ret = msm_hdmi_pll_8996_init(pdev); break; /* * we don't have PLL support for these, don't report an error for now */ case MSM_HDMI_PHY_8x60: case MSM_HDMI_PHY_8x74: default: ret = 0; break; } return ret; }

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static int msm_hdmi_phy_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct hdmi_phy *phy; int ret; phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENODEV; phy->cfg = (struct hdmi_phy_cfg *)of_device_get_match_data(dev); if (!phy->cfg) return -ENODEV; phy->mmio = msm_ioremap(pdev, "hdmi_phy", "HDMI_PHY"); if (IS_ERR(phy->mmio)) { dev_err(dev, "%s: failed to map phy base\n", __func__); return -ENOMEM; } phy->pdev = pdev; ret = msm_hdmi_phy_resource_init(phy); if (ret) return ret; pm_runtime_enable(&pdev->dev); ret = msm_hdmi_phy_resource_enable(phy); if (ret) return ret; ret = msm_hdmi_phy_pll_init(pdev, phy->cfg->type); if (ret) { dev_err(dev, "couldn't init PLL\n"); msm_hdmi_phy_resource_disable(phy); return ret; } msm_hdmi_phy_resource_disable(phy); platform_set_drvdata(pdev, phy); return 0; }

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static int msm_hdmi_phy_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); return 0; }

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static const struct of_device_id msm_hdmi_phy_dt_match[] = { { .compatible = "qcom,hdmi-phy-8660", .data = &msm_hdmi_phy_8x60_cfg }, { .compatible = "qcom,hdmi-phy-8960", .data = &msm_hdmi_phy_8960_cfg }, { .compatible = "qcom,hdmi-phy-8974", .data = &msm_hdmi_phy_8x74_cfg }, { .compatible = "qcom,hdmi-phy-8084", .data = &msm_hdmi_phy_8x74_cfg }, { .compatible = "qcom,hdmi-phy-8996", .data = &msm_hdmi_phy_8996_cfg }, {} }; static struct platform_driver msm_hdmi_phy_platform_driver = { .probe = msm_hdmi_phy_probe, .remove = msm_hdmi_phy_remove, .driver = { .name = "msm_hdmi_phy", .of_match_table = msm_hdmi_phy_dt_match, }, };
void __init msm_hdmi_phy_driver_register(void) { platform_driver_register(&msm_hdmi_phy_platform_driver); }

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void __exit msm_hdmi_phy_driver_unregister(void) { platform_driver_unregister(&msm_hdmi_phy_platform_driver); }

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