openwrt/target/linux/ipq806x/patches-6.1/122-04-clk-qcom-krait-cc-rework-mux-reset-logic-and-reset-h.patch

From 6a77cf3f5f95ec0058e1b4d1ada018748cb0b83b Mon Sep 17 00:00:00 2001
From: Christian Marangi <[email protected]>
Date: Thu, 15 Sep 2022 03:33:13 +0200
Subject: [PATCH 9/9] clk: qcom: krait-cc: rework mux reset logic and reset
 hfpll

Rework and clean mux reset logic.
Compact it to a for loop to handle both CPU and L2 in one place.
Move hardcoded aux_rate to define and add a new hfpll_rate value to
reset hfpll settings.
Change logic to now reset the hfpll to the lowest value of 600 Mhz and
then restoring the previous frequency. This permits to reset the hfpll if
the primary mux was set to source out of the secondary mux.

Signed-off-by: Christian Marangi <[email protected]>
---
 drivers/clk/qcom/krait-cc.c | 50 +++++++++++++++++--------------------
 1 file changed, 23 insertions(+), 27 deletions(-)

--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -25,7 +25,9 @@ enum {
 	clks_max,
 };
 
-#define QSB_RATE	2250000000
+#define QSB_RATE	225000000
+#define AUX_RATE	384000000
+#define HFPLL_RATE	600000000
 
 static unsigned int sec_mux_map[] = {
 	2,
@@ -350,7 +352,7 @@ static int krait_cc_probe(struct platfor
 {
 	struct device *dev = &pdev->dev;
 	const struct of_device_id *id;
-	unsigned long cur_rate, aux_rate, qsb_rate;
+	unsigned long cur_rate, qsb_rate;
 	int cpu;
 	struct clk_hw *mux, *l2_pri_mux;
 	struct clk *clk, **clks;
@@ -420,28 +422,29 @@ static int krait_cc_probe(struct platfor
 	 * two different rates to force a HFPLL reinit under all
 	 * circumstances.
 	 */
-	cur_rate = clk_get_rate(clks[l2_mux]);
-	aux_rate = 384000000;
-	if (cur_rate < aux_rate) {
-		dev_info(dev, "L2 @ Undefined rate. Forcing new rate.\n");
-		cur_rate = aux_rate;
-	}
-	clk_set_rate(clks[l2_mux], aux_rate);
-	clk_set_rate(clks[l2_mux], 2);
-	clk_set_rate(clks[l2_mux], cur_rate);
-	dev_info(dev, "L2 @ %lu KHz\n", clk_get_rate(clks[l2_mux]) / 1000);
-	for_each_possible_cpu(cpu) {
+	for (cpu = 0; cpu < 5; cpu++) {
+		const char *l2_s = "L2";
+		char cpu_s[5];
+
 		clk = clks[cpu];
+		if (!clk)
+			continue;
+
+		if (cpu < 4)
+			snprintf(cpu_s, 5, "CPU%d", cpu);
+
 		cur_rate = clk_get_rate(clk);
-		if (cur_rate < aux_rate) {
-			dev_info(dev, "CPU%d @ Undefined rate. Forcing new rate.\n", cpu);
-			cur_rate = aux_rate;
+		if (cur_rate < AUX_RATE) {
+			dev_info(dev, "%s @ Undefined rate. Forcing new rate.\n",
+				 cpu < 4 ? cpu_s : l2_s);
+			cur_rate = AUX_RATE;
 		}
 
-		clk_set_rate(clk, aux_rate);
-		clk_set_rate(clk, 2);
+		clk_set_rate(clk, AUX_RATE);
+		clk_set_rate(clk, HFPLL_RATE);
 		clk_set_rate(clk, cur_rate);
-		dev_info(dev, "CPU%d @ %lu KHz\n", cpu, clk_get_rate(clk) / 1000);
+		dev_info(dev, "%s @ %lu KHz\n", cpu < 4 ? cpu_s : l2_s,
+			 clk_get_rate(clk) / 1000);
 	}
 
 	of_clk_add_provider(dev->of_node, krait_of_get, clks);