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- 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;
- }
-
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