drm/msm/dp: rewrite dss_module_power to use bulk clock functions

In order to simplify DP code, drop hand-coded loops over clock arrays,
replacing them with clk_bulk_* functions.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/474717/
Link: https://lore.kernel.org/r/20220217055529.499829-6-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/Makefile

@@ -119,7 +119,6 @@ msm-$(CONFIG_DRM_MSM_GPU_STATE)	+= adreno/a6xx_gpu_state.o
 
 msm-$(CONFIG_DRM_MSM_DP)+= dp/dp_aux.o \
 	dp/dp_catalog.o \
-	dp/dp_clk_util.o \
 	dp/dp_ctrl.o \
 	dp/dp_display.o \
 	dp/dp_drm.o \

drivers/gpu/drm/msm/dp/dp_clk_util.c

-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2012-2015, 2017-2018, The Linux Foundation.
- * All rights reserved.
- */
-
-#include <linux/clk.h>
-#include <linux/clk/clk-conf.h>
-#include <linux/err.h>
-#include <linux/delay.h>
-#include <linux/of.h>
-
-#include <drm/drm_print.h>
-
-#include "dp_clk_util.h"
-
-void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk)
-{
-	int i;
-
-	for (i = num_clk - 1; i >= 0; i--) {
-		if (clk_arry[i].clk)
-			clk_put(clk_arry[i].clk);
-		clk_arry[i].clk = NULL;
-	}
-}
-
-int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk)
-{
-	int i, rc = 0;
-
-	for (i = 0; i < num_clk; i++) {
-		clk_arry[i].clk = clk_get(dev, clk_arry[i].clk_name);
-		rc = PTR_ERR_OR_ZERO(clk_arry[i].clk);
-		if (rc) {
-			DEV_ERR("%pS->%s: '%s' get failed. rc=%d\n",
-				__builtin_return_address(0), __func__,
-				clk_arry[i].clk_name, rc);
-			goto error;
-		}
-	}
-
-	return rc;
-
-error:
-	for (i--; i >= 0; i--) {
-		if (clk_arry[i].clk)
-			clk_put(clk_arry[i].clk);
-		clk_arry[i].clk = NULL;
-	}
-
-	return rc;
-}
-
-int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
-{
-	int i, rc = 0;
-
-	if (enable) {
-		for (i = 0; i < num_clk; i++) {
-			DEV_DBG("%pS->%s: enable '%s'\n",
-				__builtin_return_address(0), __func__,
-				clk_arry[i].clk_name);
-			rc = clk_prepare_enable(clk_arry[i].clk);
-			if (rc)
-				DEV_ERR("%pS->%s: %s en fail. rc=%d\n",
-					__builtin_return_address(0),
-					__func__,
-					clk_arry[i].clk_name, rc);
-
-			if (rc && i) {
-				msm_dss_enable_clk(&clk_arry[i - 1],
-					i - 1, false);
-				break;
-			}
-		}
-	} else {
-		for (i = num_clk - 1; i >= 0; i--) {
-			DEV_DBG("%pS->%s: disable '%s'\n",
-				__builtin_return_address(0), __func__,
-				clk_arry[i].clk_name);
-
-			clk_disable_unprepare(clk_arry[i].clk);
-		}
-	}
-
-	return rc;
-}

drivers/gpu/drm/msm/dp/dp_clk_util.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2012, 2017-2018, The Linux Foundation. All rights reserved.
- */
-
-#ifndef __DP_CLK_UTIL_H__
-#define __DP_CLK_UTIL_H__
-
-#include <linux/platform_device.h>
-#include <linux/types.h>
-
-#define DEV_DBG(fmt, args...)   pr_debug(fmt, ##args)
-#define DEV_INFO(fmt, args...)  pr_info(fmt, ##args)
-#define DEV_WARN(fmt, args...)  pr_warn(fmt, ##args)
-#define DEV_ERR(fmt, args...)   pr_err(fmt, ##args)
-
-struct dss_clk {
-	struct clk *clk; /* clk handle */
-	char clk_name[32];
-};
-
-struct dss_module_power {
-	unsigned int num_clk;
-	struct dss_clk *clk_config;
-};
-
-int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk);
-void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk);
-int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable);
-#endif /* __DP_CLK_UTIL_H__ */

drivers/gpu/drm/msm/dp/dp_ctrl.c

@@ -1321,9 +1321,9 @@ static void dp_ctrl_set_clock_rate(struct dp_ctrl_private *ctrl,
 			enum dp_pm_type module, char *name, unsigned long rate)
 {
 	u32 num = ctrl->parser->mp[module].num_clk;
-	struct dss_clk *cfg = ctrl->parser->mp[module].clk_config;
+	struct clk_bulk_data *cfg = ctrl->parser->mp[module].clocks;
 
-	while (num && strcmp(cfg->clk_name, name)) {
+	while (num && strcmp(cfg->id, name)) {
 		num--;
 		cfg++;
 	}

drivers/gpu/drm/msm/dp/dp_parser.c

@@ -162,11 +162,11 @@ static int dp_parser_init_clk_data(struct dp_parser *parser)
 	}
 
 	core_power->num_clk = core_clk_count;
-	core_power->clk_config = devm_kzalloc(dev,
-			sizeof(struct dss_clk) * core_power->num_clk,
+	core_power->clocks = devm_kcalloc(dev,
+			core_power->num_clk, sizeof(struct clk_bulk_data),
 			GFP_KERNEL);
-	if (!core_power->clk_config)
-		return -EINVAL;
+	if (!core_power->clocks)
+		return -ENOMEM;
 
 	/* Initialize the CTRL power module */
 	if (ctrl_clk_count == 0) {
@@ -175,12 +175,12 @@ static int dp_parser_init_clk_data(struct dp_parser *parser)
 	}
 
 	ctrl_power->num_clk = ctrl_clk_count;
-	ctrl_power->clk_config = devm_kzalloc(dev,
-			sizeof(struct dss_clk) * ctrl_power->num_clk,
+	ctrl_power->clocks = devm_kcalloc(dev,
+			ctrl_power->num_clk, sizeof(struct clk_bulk_data),
 			GFP_KERNEL);
-	if (!ctrl_power->clk_config) {
+	if (!ctrl_power->clocks) {
 		ctrl_power->num_clk = 0;
-		return -EINVAL;
+		return -ENOMEM;
 	}
 
 	/* Initialize the STREAM power module */
@@ -190,12 +190,12 @@ static int dp_parser_init_clk_data(struct dp_parser *parser)
 	}
 
 	stream_power->num_clk = stream_clk_count;
-	stream_power->clk_config = devm_kzalloc(dev,
-			sizeof(struct dss_clk) * stream_power->num_clk,
+	stream_power->clocks = devm_kcalloc(dev,
+			stream_power->num_clk, sizeof(struct clk_bulk_data),
 			GFP_KERNEL);
-	if (!stream_power->clk_config) {
+	if (!stream_power->clocks) {
 		stream_power->num_clk = 0;
-		return -EINVAL;
+		return -ENOMEM;
 	}
 
 	return 0;
@@ -234,21 +234,15 @@ static int dp_parser_clock(struct dp_parser *parser)
 		}
 		if (dp_parser_check_prefix("core", clk_name) &&
 				core_clk_index < core_clk_count) {
-			struct dss_clk *clk =
-				&core_power->clk_config[core_clk_index];
-			strlcpy(clk->clk_name, clk_name, sizeof(clk->clk_name));
+			core_power->clocks[core_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
 			core_clk_index++;
 		} else if (dp_parser_check_prefix("stream", clk_name) &&
 				stream_clk_index < stream_clk_count) {
-			struct dss_clk *clk =
-				&stream_power->clk_config[stream_clk_index];
-			strlcpy(clk->clk_name, clk_name, sizeof(clk->clk_name));
+			stream_power->clocks[stream_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
 			stream_clk_index++;
 		} else if (dp_parser_check_prefix("ctrl", clk_name) &&
 			   ctrl_clk_index < ctrl_clk_count) {
-			struct dss_clk *clk =
-				&ctrl_power->clk_config[ctrl_clk_index];
-			strlcpy(clk->clk_name, clk_name, sizeof(clk->clk_name));
+			ctrl_power->clocks[ctrl_clk_index].id = devm_kstrdup(dev, clk_name, GFP_KERNEL);
 			ctrl_clk_index++;
 		}
 	}

drivers/gpu/drm/msm/dp/dp_parser.h

@@ -10,7 +10,6 @@
 #include <linux/phy/phy.h>
 #include <linux/phy/phy-dp.h>
 
-#include "dp_clk_util.h"
 #include "msm_drv.h"
 
 #define DP_LABEL "MDSS DP DISPLAY"
@@ -106,6 +105,11 @@ struct dp_regulator_cfg {
 	struct dp_reg_entry regs[DP_DEV_REGULATOR_MAX];
 };
 
+struct dss_module_power {
+	unsigned int num_clk;
+	struct clk_bulk_data *clocks;
+};
+
 /**
  * struct dp_parser - DP parser's data exposed to clients
  *

drivers/gpu/drm/msm/dp/dp_power.c

@@ -106,51 +106,30 @@ static int dp_power_clk_init(struct dp_power_private *power)
 	ctrl = &power->parser->mp[DP_CTRL_PM];
 	stream = &power->parser->mp[DP_STREAM_PM];
 
-	rc = msm_dss_get_clk(dev, core->clk_config, core->num_clk);
+	rc = devm_clk_bulk_get(dev, core->num_clk, core->clocks);
 	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);
+	rc = devm_clk_bulk_get(dev, ctrl->num_clk, ctrl->clocks);
 	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;
 	}
 
-	rc = msm_dss_get_clk(dev, stream->clk_config, stream->num_clk);
+	rc = devm_clk_bulk_get(dev, stream->num_clk, stream->clocks);
 	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, *stream;
-
-	core = &power->parser->mp[DP_CORE_PM];
-	ctrl = &power->parser->mp[DP_CTRL_PM];
-	stream = &power->parser->mp[DP_STREAM_PM];
-
-	if (!core || !ctrl || !stream) {
-		DRM_ERROR("invalid power_data\n");
-		return -EINVAL;
-	}
-
-	msm_dss_put_clk(ctrl->clk_config, ctrl->num_clk);
-	msm_dss_put_clk(core->clk_config, core->num_clk);
-	msm_dss_put_clk(stream->clk_config, stream->num_clk);
-	return 0;
-}
-
 int dp_power_clk_status(struct dp_power *dp_power, enum dp_pm_type pm_type)
 {
 	struct dp_power_private *power;
@@ -213,7 +192,7 @@ int dp_power_clk_enable(struct dp_power *dp_power,
 					"Enable core clks before link clks\n");
 			mp = &power->parser->mp[DP_CORE_PM];
 
-			rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, enable);
+			rc = clk_bulk_prepare_enable(mp->num_clk, mp->clocks);
 			if (rc) {
 				DRM_ERROR("fail to enable clks: %s. err=%d\n",
 					dp_parser_pm_name(DP_CORE_PM), rc);
@@ -224,12 +203,14 @@ int dp_power_clk_enable(struct dp_power *dp_power,
 	}
 
 	mp = &power->parser->mp[pm_type];
-	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, 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 (enable) {
+		rc = clk_bulk_prepare_enable(mp->num_clk, mp->clocks);
+		if (rc) {
+			DRM_ERROR("failed to enable clks, err: %d\n", rc);
+			return rc;
+		}
+	} else {
+		clk_bulk_disable_unprepare(mp->num_clk, mp->clocks);
 	}
 
 	if (pm_type == DP_CORE_PM)
@@ -294,9 +275,7 @@ void dp_power_client_deinit(struct dp_power *dp_power)
 
 	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_init(struct dp_power *dp_power, bool flip)