From c943b4948b5848fc0e07f875edbd35a973879e22 Mon Sep 17 00:00:00 2001 From: Chandan Uddaraju Date: Thu, 27 Aug 2020 14:16:55 -0700 Subject: drm/msm/dp: add displayPort driver support Add the needed displayPort files to enable DP driver on msm target. "dp_display" module is the main module that calls into other sub-modules. "dp_drm" file represents the interface between DRM framework and DP driver. Changes in v12: -- Add support of pm ops in display port driver -- Clear bpp depth bits before writing to MISC register -- Fix edid read Previous Change log: https://lkml.kernel.org/lkml/20200818051137.21478-3-tanmay@codeaurora.org/ Signed-off-by: Chandan Uddaraju Signed-off-by: Vara Reddy Signed-off-by: Tanmay Shah Co-developed-by: Abhinav Kumar Signed-off-by: Abhinav Kumar Co-developed-by: Kuogee Hsieh Signed-off-by: Kuogee Hsieh Co-developed-by: Guenter Roeck Signed-off-by: Guenter Roeck Co-developed-by: Stephen Boyd Signed-off-by: Stephen Boyd Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/dp/dp_power.c | 363 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 363 insertions(+) create mode 100644 drivers/gpu/drm/msm/dp/dp_power.c (limited to 'drivers/gpu/drm/msm/dp/dp_power.c') diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c new file mode 100644 index 000000000000..4aaa0aae4883 --- /dev/null +++ b/drivers/gpu/drm/msm/dp/dp_power.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved. + */ + +#define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__ + +#include +#include +#include +#include "dp_power.h" + +struct dp_power_private { + struct dp_parser *parser; + struct platform_device *pdev; + struct clk *link_clk_src; + struct clk *pixel_provider; + struct clk *link_provider; + struct regulator_bulk_data supplies[DP_DEV_REGULATOR_MAX]; + + struct dp_power dp_power; +}; + +static void dp_power_regulator_disable(struct dp_power_private *power) +{ + struct regulator_bulk_data *s = power->supplies; + const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs; + int num = power->parser->regulator_cfg->num; + int i; + + DBG(""); + for (i = num - 1; i >= 0; i--) + if (regs[i].disable_load >= 0) + regulator_set_load(s[i].consumer, + regs[i].disable_load); + + regulator_bulk_disable(num, s); +} + +static int dp_power_regulator_enable(struct dp_power_private *power) +{ + struct regulator_bulk_data *s = power->supplies; + const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs; + int num = power->parser->regulator_cfg->num; + int ret, i; + + DBG(""); + for (i = 0; i < num; i++) { + if (regs[i].enable_load >= 0) { + ret = regulator_set_load(s[i].consumer, + regs[i].enable_load); + if (ret < 0) { + pr_err("regulator %d set op mode failed, %d\n", + i, ret); + goto fail; + } + } + } + + ret = regulator_bulk_enable(num, s); + if (ret < 0) { + pr_err("regulator enable failed, %d\n", ret); + goto fail; + } + + return 0; + +fail: + for (i--; i >= 0; i--) + regulator_set_load(s[i].consumer, regs[i].disable_load); + return ret; +} + +static int dp_power_regulator_init(struct dp_power_private *power) +{ + struct regulator_bulk_data *s = power->supplies; + const struct dp_reg_entry *regs = power->parser->regulator_cfg->regs; + struct platform_device *pdev = power->pdev; + int num = power->parser->regulator_cfg->num; + int i, ret; + + for (i = 0; i < num; i++) + s[i].supply = regs[i].name; + + ret = devm_regulator_bulk_get(&pdev->dev, num, s); + if (ret < 0) { + pr_err("%s: failed to init regulator, ret=%d\n", + __func__, ret); + return ret; + } + + return 0; +} + +static int dp_power_clk_init(struct dp_power_private *power) +{ + int rc = 0; + struct dss_module_power *core, *ctrl; + struct device *dev = &power->pdev->dev; + + core = &power->parser->mp[DP_CORE_PM]; + ctrl = &power->parser->mp[DP_CTRL_PM]; + + rc = msm_dss_get_clk(dev, core->clk_config, core->num_clk); + if (rc) { + DRM_ERROR("failed to get %s clk. err=%d\n", + dp_parser_pm_name(DP_CORE_PM), rc); + return rc; + } + + rc = msm_dss_get_clk(dev, ctrl->clk_config, ctrl->num_clk); + if (rc) { + DRM_ERROR("failed to get %s clk. err=%d\n", + dp_parser_pm_name(DP_CTRL_PM), rc); + msm_dss_put_clk(core->clk_config, core->num_clk); + return -ENODEV; + } + + return 0; +} + +static int dp_power_clk_deinit(struct dp_power_private *power) +{ + struct dss_module_power *core, *ctrl; + + core = &power->parser->mp[DP_CORE_PM]; + ctrl = &power->parser->mp[DP_CTRL_PM]; + + if (!core || !ctrl) + return -EINVAL; + + msm_dss_put_clk(ctrl->clk_config, ctrl->num_clk); + msm_dss_put_clk(core->clk_config, core->num_clk); + return 0; +} + +static int dp_power_clk_set_rate(struct dp_power_private *power, + enum dp_pm_type module, bool enable) +{ + int rc = 0; + struct dss_module_power *mp = &power->parser->mp[module]; + + if (enable) { + rc = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk); + if (rc) { + DRM_ERROR("failed to set clks rate.\n"); + return rc; + } + } + + rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, enable); + if (rc) { + DRM_ERROR("failed to %d clks, err: %d\n", enable, rc); + return rc; + } + + return 0; +} + +int dp_power_clk_enable(struct dp_power *dp_power, + enum dp_pm_type pm_type, bool enable) +{ + int rc = 0; + struct dp_power_private *power; + + power = container_of(dp_power, struct dp_power_private, dp_power); + + if (pm_type != DP_CORE_PM && pm_type != DP_CTRL_PM) { + DRM_ERROR("unsupported power module: %s\n", + dp_parser_pm_name(pm_type)); + return -EINVAL; + } + + if (enable) { + if (pm_type == DP_CORE_PM && dp_power->core_clks_on) { + DRM_DEBUG_DP("core clks already enabled\n"); + return 0; + } + + if (pm_type == DP_CTRL_PM && dp_power->link_clks_on) { + DRM_DEBUG_DP("links clks already enabled\n"); + return 0; + } + + if ((pm_type == DP_CTRL_PM) && (!dp_power->core_clks_on)) { + DRM_DEBUG_DP("Enable core clks before link clks\n"); + + rc = dp_power_clk_set_rate(power, DP_CORE_PM, enable); + if (rc) { + DRM_ERROR("fail to enable clks: %s. err=%d\n", + dp_parser_pm_name(DP_CORE_PM), rc); + return rc; + } + dp_power->core_clks_on = true; + } + } + + rc = dp_power_clk_set_rate(power, pm_type, enable); + if (rc) { + DRM_ERROR("failed to '%s' clks for: %s. err=%d\n", + enable ? "enable" : "disable", + dp_parser_pm_name(pm_type), rc); + return rc; + } + + if (pm_type == DP_CORE_PM) + dp_power->core_clks_on = enable; + else + dp_power->link_clks_on = enable; + + DRM_DEBUG_DP("%s clocks for %s\n", + enable ? "enable" : "disable", + dp_parser_pm_name(pm_type)); + DRM_DEBUG_DP("link_clks:%s core_clks:%s\n", + dp_power->link_clks_on ? "on" : "off", + dp_power->core_clks_on ? "on" : "off"); + + return 0; +} + +int dp_power_client_init(struct dp_power *dp_power) +{ + int rc = 0; + struct dp_power_private *power; + + if (!dp_power) { + DRM_ERROR("invalid power data\n"); + return -EINVAL; + } + + power = container_of(dp_power, struct dp_power_private, dp_power); + + pm_runtime_enable(&power->pdev->dev); + + rc = dp_power_regulator_init(power); + if (rc) { + DRM_ERROR("failed to init regulators %d\n", rc); + goto error; + } + + rc = dp_power_clk_init(power); + if (rc) { + DRM_ERROR("failed to init clocks %d\n", rc); + goto error; + } + return 0; + +error: + pm_runtime_disable(&power->pdev->dev); + return rc; +} + +void dp_power_client_deinit(struct dp_power *dp_power) +{ + struct dp_power_private *power; + + if (!dp_power) { + DRM_ERROR("invalid power data\n"); + return; + } + + power = container_of(dp_power, struct dp_power_private, dp_power); + + dp_power_clk_deinit(power); + pm_runtime_disable(&power->pdev->dev); + +} + +int dp_power_set_link_clk_parent(struct dp_power *dp_power) +{ + int rc = 0; + struct dp_power_private *power; + u32 num; + struct dss_clk *cfg; + char *name = "ctrl_link"; + + if (!dp_power) { + DRM_ERROR("invalid power data\n"); + rc = -EINVAL; + goto exit; + } + + power = container_of(dp_power, struct dp_power_private, dp_power); + + num = power->parser->mp[DP_CTRL_PM].num_clk; + cfg = power->parser->mp[DP_CTRL_PM].clk_config; + + while (num && strcmp(cfg->clk_name, name)) { + num--; + cfg++; + } + +exit: + return rc; +} + +int dp_power_init(struct dp_power *dp_power, bool flip) +{ + int rc = 0; + struct dp_power_private *power = NULL; + + if (!dp_power) { + DRM_ERROR("invalid power data\n"); + return -EINVAL; + } + + power = container_of(dp_power, struct dp_power_private, dp_power); + + pm_runtime_get_sync(&power->pdev->dev); + rc = dp_power_regulator_enable(power); + if (rc) { + DRM_ERROR("failed to enable regulators, %d\n", rc); + goto exit; + } + + rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true); + if (rc) { + DRM_ERROR("failed to enable DP core clocks, %d\n", rc); + goto err_clk; + } + + return 0; + +err_clk: + dp_power_regulator_disable(power); +exit: + pm_runtime_put_sync(&power->pdev->dev); + return rc; +} + +int dp_power_deinit(struct dp_power *dp_power) +{ + struct dp_power_private *power; + + power = container_of(dp_power, struct dp_power_private, dp_power); + + dp_power_clk_enable(dp_power, DP_CORE_PM, false); + dp_power_regulator_disable(power); + pm_runtime_put_sync(&power->pdev->dev); + return 0; +} + +struct dp_power *dp_power_get(struct dp_parser *parser) +{ + struct dp_power_private *power; + struct dp_power *dp_power; + + if (!parser) { + DRM_ERROR("invalid input\n"); + return ERR_PTR(-EINVAL); + } + + power = devm_kzalloc(&parser->pdev->dev, sizeof(*power), GFP_KERNEL); + if (!power) + return ERR_PTR(-ENOMEM); + + power->parser = parser; + power->pdev = parser->pdev; + + dp_power = &power->dp_power; + + return dp_power; +} -- cgit v1.2.3