Merge "clk: qcom: Add support to log PLL/RCGR values in case of failure"

drivers/clk/clk.c

@@ -2649,7 +2649,7 @@ static const struct file_operations clk_enabled_list_fops = {
 	.release	= seq_release,
 };
 
-static void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
+void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
 {
 	if (IS_ERR_OR_NULL(clk))
 		return;
@@ -2663,6 +2663,7 @@ static void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
 
 	clk->ops->list_registers(f, clk->hw);
 }
+EXPORT_SYMBOL(clk_debug_print_hw);
 
 static int print_hw_show(struct seq_file *m, void *unused)
 {

drivers/clk/clk.h

@@ -25,6 +25,7 @@ void __clk_free_clk(struct clk *clk);
 void clock_debug_print_enabled(void);
 int clk_register_debug(struct clk_hw *hw, struct dentry *dentry);
 void clk_debug_measure_add(struct clk_hw *hw, struct dentry *dentry);
+void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f);
 
 #else
 /* All these casts to avoid ifdefs in clkdev... */

drivers/clk/qcom/clk-alpha-pll.c

@@ -16,8 +16,10 @@
 #include <linux/clk-provider.h>
 #include <linux/regmap.h>
 #include <linux/delay.h>
+#include <linux/sched.h>
 
 #include "clk-alpha-pll.h"
+#include "common.h"
 
 #define PLL_MODE		0x00
 #define PLL_OUTCTRL		BIT(0)
@@ -74,13 +76,17 @@ static int wait_for_pll(struct clk_alpha_pll *pll, u32 mask, bool inverse,
 	u32 val, off;
 	int count;
 	int ret;
-	const char *name = clk_hw_get_name(&pll->clkr.hw);
+	u64 time;
+	struct clk_hw *hw = &pll->clkr.hw;
+	const char *name = clk_hw_get_name(hw);
 
 	off = pll->offset;
 	ret = regmap_read(pll->clkr.regmap, off + PLL_MODE, &val);
 	if (ret)
 		return ret;
 
+	time = sched_clock();
+
 	for (count = 100; count > 0; count--) {
 		ret = regmap_read(pll->clkr.regmap, off + PLL_MODE, &val);
 		if (ret)
@@ -93,7 +99,13 @@ static int wait_for_pll(struct clk_alpha_pll *pll, u32 mask, bool inverse,
 		udelay(1);
 	}
 
-	WARN(1, "%s failed to %s!\n", name, action);
+	time = sched_clock() - time;
+
+	pr_err("PLL lock bit detection total wait time: %lld ns", time);
+
+	WARN_CLK(hw->core, name, 1, "failed to %s!\n", action);
+
+
 	return -ETIMEDOUT;
 }
 
@@ -589,7 +601,11 @@ static void clk_alpha_pll_list_registers(struct seq_file *f, struct clk_hw *hw)
 		{"PLL_ALPHA_VAL", 0x8},
 		{"PLL_ALPHA_VAL_U", 0xC},
 		{"PLL_USER_CTL", 0x10},
+		{"PLL_USER_CTL_U", 0x14},
 		{"PLL_CONFIG_CTL", 0x18},
+		{"PLL_TEST_CTL", 0x1c},
+		{"PLL_TEST_CTL_U", 0x20},
+		{"PLL_STATUS", 0x24},
 	};
 
 	static struct clk_register_data data1[] = {
@@ -601,7 +617,8 @@ static void clk_alpha_pll_list_registers(struct seq_file *f, struct clk_hw *hw)
 	for (i = 0; i < size; i++) {
 		regmap_read(pll->clkr.regmap, pll->offset + data[i].offset,
 					&val);
-		seq_printf(f, "%20s: 0x%.8x\n", data[i].name, val);
+		clock_debug_output(f, false, "%20s: 0x%.8x\n",
+							data[i].name, val);
 	}
 
 	regmap_read(pll->clkr.regmap, pll->offset + data[0].offset, &val);
@@ -609,7 +626,8 @@ static void clk_alpha_pll_list_registers(struct seq_file *f, struct clk_hw *hw)
 	if (val & PLL_FSM_ENA) {
 		regmap_read(pll->clkr.regmap, pll->clkr.enable_reg +
 					data1[0].offset, &val);
-		seq_printf(f, "%20s: 0x%.8x\n", data1[0].name, val);
+		clock_debug_output(f, false, "%20s: 0x%.8x\n",
+							data1[0].name, val);
 	}
 }
 

drivers/clk/qcom/clk-branch.c

@@ -22,6 +22,7 @@
 
 #include "clk-branch.h"
 #include "clk-regmap.h"
+#include "common.h"
 
 static bool clk_branch_in_hwcg_mode(const struct clk_branch *br)
 {
@@ -77,7 +78,8 @@ static int clk_branch_wait(const struct clk_branch *br, bool enabling,
 		bool (check_halt)(const struct clk_branch *, bool))
 {
 	bool voted = br->halt_check & BRANCH_VOTED;
-	const char *name = clk_hw_get_name(&br->clkr.hw);
+	const struct clk_hw *hw = &br->clkr.hw;
+	const char *name = clk_hw_get_name(hw);
 
 	/* Skip checking halt bit if the clock is in hardware gated mode */
 	if (clk_branch_in_hwcg_mode(br))
@@ -104,8 +106,10 @@ static int clk_branch_wait(const struct clk_branch *br, bool enabling,
 				return 0;
 			udelay(1);
 		}
-		WARN(1, "%s status stuck at 'o%s'", name,
+
-				enabling ? "ff" : "n");
+		WARN_CLK(hw->core, name, 1, "status stuck at 'o%s'",
+						enabling ? "ff" : "n");
+
 		return -EBUSY;
 	}
 	return 0;
@@ -212,7 +216,8 @@ static void clk_branch2_list_registers(struct seq_file *f, struct clk_hw *hw)
 	for (i = 0; i < size; i++) {
 		regmap_read(br->clkr.regmap, br->halt_reg + data[i].offset,
 					&val);
-		seq_printf(f, "%20s: 0x%.8x\n", data[i].name, val);
+		clock_debug_output(f, false, "%20s: 0x%.8x\n",
+							data[i].name, val);
 	}
 
 	if ((br->halt_check & BRANCH_HALT_VOTED) &&
@@ -222,7 +227,7 @@ static void clk_branch2_list_registers(struct seq_file *f, struct clk_hw *hw)
 			for (i = 0; i < size; i++) {
 				regmap_read(br->clkr.regmap, rclk->enable_reg +
 						data1[i].offset, &val);
-				seq_printf(f, "%20s: 0x%.8x\n",
+				clock_debug_output(f, false, "%20s: 0x%.8x\n",
 						data1[i].name, val);
 			}
 		}
@@ -360,7 +365,8 @@ static void clk_gate2_list_registers(struct seq_file *f, struct clk_hw *hw)
 	for (i = 0; i < size; i++) {
 		regmap_read(gt->clkr.regmap, gt->clkr.enable_reg +
 					data[i].offset, &val);
-		seq_printf(f, "%20s: 0x%.8x\n", data[i].name, val);
+		clock_debug_output(f, false, "%20s: 0x%.8x\n",
+						data[i].name, val);
 	}
 }
 

drivers/clk/qcom/clk-rcg2.c

@@ -122,7 +122,7 @@ err:
 	return 0;
 }
 
-static int update_config(struct clk_rcg2 *rcg)
+static int update_config(struct clk_rcg2 *rcg, u32 cfg)
 {
 	int count, ret;
 	u32 cmd;
@@ -144,7 +144,11 @@ static int update_config(struct clk_rcg2 *rcg)
 		udelay(1);
 	}
 
-	WARN(1, "%s: rcg didn't update its configuration.", name);
+	pr_err("CFG_RCGR old frequency configuration 0x%x !\n", cfg);
+
+	WARN_CLK(hw->core, name, count == 0,
+			"rcg didn't update its configuration.");
+
 	return 0;
 }
 
@@ -153,13 +157,17 @@ static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
 	int ret;
 	u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
+	u32 old_cfg;
+
+	/* Read back the old configuration */
+	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &old_cfg);
 
 	ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
 				 CFG_SRC_SEL_MASK, cfg);
 	if (ret)
 		return ret;
 
-	return update_config(rcg);
+	return update_config(rcg, old_cfg);
 }
 
 static void clk_rcg_clear_force_enable(struct clk_hw *hw)
@@ -297,13 +305,16 @@ static int clk_rcg2_determine_rate(struct clk_hw *hw,
 
 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
 {
-	u32 cfg, mask;
+	u32 cfg, mask, old_cfg;
 	struct clk_hw *hw = &rcg->clkr.hw;
 	int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
 
 	if (index < 0)
 		return index;
 
+	/* Read back the old configuration */
+	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &old_cfg);
+
 	if (rcg->mnd_width && f->n) {
 		mask = BIT(rcg->mnd_width) - 1;
 		ret = regmap_update_bits(rcg->clkr.regmap,
@@ -333,7 +344,7 @@ static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
 	if (ret)
 		return ret;
 
-	return update_config(rcg);
+	return update_config(rcg, old_cfg);
 }
 
 static void clk_rcg2_list_registers(struct seq_file *f, struct clk_hw *hw)
@@ -359,14 +370,16 @@ static void clk_rcg2_list_registers(struct seq_file *f, struct clk_hw *hw)
 		for (i = 0; i < size; i++) {
 			regmap_read(rcg->clkr.regmap, (rcg->cmd_rcgr +
 					data1[i].offset), &val);
-			seq_printf(f, "%20s: 0x%.8x\n",	data1[i].name, val);
+			clock_debug_output(f, false, "%20s: 0x%.8x\n",
+						data1[i].name, val);
 		}
 	} else {
 		size = ARRAY_SIZE(data);
 		for (i = 0; i < size; i++) {
 			regmap_read(rcg->clkr.regmap, (rcg->cmd_rcgr +
 				data[i].offset), &val);
-			seq_printf(f, "%20s: 0x%.8x\n",	data[i].name, val);
+			clock_debug_output(f, false, "%20s: 0x%.8x\n",
+						data[i].name, val);
 		}
 	}
 }
@@ -1186,16 +1199,19 @@ static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
 		unsigned long parent_rate, u8 index)
 {
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
-	u32 cfg;
+	u32 cfg, old_cfg;
 	int ret;
 
+	/* Read back the old configuration */
+	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &old_cfg);
+
 	/* Just mux it, we don't use the division or m/n hardware */
 	cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
 	ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg);
 	if (ret)
 		return ret;
 
-	return update_config(rcg);
+	return update_config(rcg, old_cfg);
 }
 
 static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -1271,9 +1287,12 @@ static int clk_gfx3d_src_set_rate_and_parent(struct clk_hw *hw,
 {
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
 	const struct freq_tbl *f;
-	u32 cfg;
+	u32 cfg, old_cfg;
 	int ret;
 
+	/* Read back the old configuration */
+	regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &old_cfg);
+
 	cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
 
 	f = qcom_find_freq(rcg->freq_tbl, rate);
@@ -1287,7 +1306,7 @@ static int clk_gfx3d_src_set_rate_and_parent(struct clk_hw *hw,
 	if (ret)
 		return ret;
 
-	return update_config(rcg);
+	return update_config(rcg, old_cfg);
 }
 
 const struct clk_ops clk_gfx3d_src_ops = {

drivers/clk/qcom/common.h

@@ -13,6 +13,8 @@
 #ifndef __QCOM_CLK_COMMON_H__
 #define __QCOM_CLK_COMMON_H__
 
+#include "../clk.h"
+
 struct platform_device;
 struct regmap_config;
 struct clk_regmap;
@@ -153,4 +155,19 @@ struct clk_debug_mux {
 
 extern const struct clk_ops clk_debug_mux_ops;
 
+#define WARN_CLK(core, name, cond, fmt, ...) do {		\
+		clk_debug_print_hw(core, NULL);			\
+		WARN(cond, "%s: " fmt, name, ##__VA_ARGS__);	\
+} while (0)
+
+#define clock_debug_output(m, c, fmt, ...)		\
+do {							\
+	if (m)						\
+		seq_printf(m, fmt, ##__VA_ARGS__);	\
+	else if (c)					\
+		pr_cont(fmt, ##__VA_ARGS__);		\
+	else						\
+		pr_info(fmt, ##__VA_ARGS__);		\
+} while (0)
+
 #endif