openwrt/target/linux/ipq806x/patches-6.1/002-v6.2-04-clk-qcom-krait-cc-handle-secondary-mux-sourcing-out-.patch

From e5dc1a4c01510da8438dddfdf4200b79d73990dc Mon Sep 17 00:00:00 2001
From: Christian Marangi <[email protected]>
Date: Wed, 9 Nov 2022 01:56:29 +0100
Subject: [PATCH 4/6] clk: qcom: krait-cc: handle secondary mux sourcing out of
 acpu_aux

Some bootloader may leave the system in an even more undefined state
with the secondary mux of L2 or other cores sourcing out of the acpu_aux
parent. This results in the clk set to the PXO rate or a PLL8 rate.

The current logic to reset the mux and set them to a defined state only
handle if the mux are configured to source out of QSB. Change this and
force a new and defined state if the current clk is lower than the aux
rate. This way we can handle any wrong configuration where the mux is
sourcing out of QSB (rate 225MHz, currently set to a virtual rate of 1),
PXO rate (rate 25MHz) or PLL8 (needs to be configured to run at 384Mhz).

Signed-off-by: Christian Marangi <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
---
 drivers/clk/qcom/krait-cc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -383,8 +383,8 @@ static int krait_cc_probe(struct platfor
 	 */
 	cur_rate = clk_get_rate(l2_pri_mux_clk);
 	aux_rate = 384000000;
-	if (cur_rate == 1) {
-		pr_info("L2 @ QSB rate. Forcing new rate.\n");
+	if (cur_rate < aux_rate) {
+		pr_info("L2 @ Undefined rate. Forcing new rate.\n");
 		cur_rate = aux_rate;
 	}
 	clk_set_rate(l2_pri_mux_clk, aux_rate);
@@ -394,8 +394,8 @@ static int krait_cc_probe(struct platfor
 	for_each_possible_cpu(cpu) {
 		clk = clks[cpu];
 		cur_rate = clk_get_rate(clk);
-		if (cur_rate == 1) {
-			pr_info("CPU%d @ QSB rate. Forcing new rate.\n", cpu);
+		if (cur_rate < aux_rate) {
+			pr_info("CPU%d @ Undefined rate. Forcing new rate.\n", cpu);
 			cur_rate = aux_rate;
 		}