[PATCH RFT v2 06/14] clk: qcom: smd-rpm: Make BI_TCXO_AO critical

Konrad Dybcio
2023-03-08T21:36:11Z

We should never let go of the active-only XO vote, as otherwise the
RPM may decide that there are no online users and it can be shut down,
resulting in a total, uncontrolled system collapse.

Guarantee this through adding the CLK_IS_CRITICAL flag.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
drivers/clk/qcom/clk-smd-rpm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-smd-rpm.c b/drivers/clk/qcom/clk-smd-rpm.c
index fec6ae4a8989..9dc779360ada 100644
--- a/drivers/clk/qcom/clk-smd-rpm.c
+++ b/drivers/clk/qcom/clk-smd-rpm.c
@@ -450,7 +450,8 @@ static const struct clk_ops clk_smd_rpm_branch_ops = {
.is_prepared = clk_smd_rpm_is_enabled,
};

-DEFINE_CLK_SMD_RPM_BRANCH_A(bi_tcxo, QCOM_SMD_RPM_MISC_CLK, 0, 19200000, 0);
+/* Disabling BI_TCXO_AO could gate the root clock source of the entire system. */
+DEFINE_CLK_SMD_RPM_BRANCH_A(bi_tcxo, QCOM_SMD_RPM_MISC_CLK, 0, 19200000, CLK_IS_CRITICAL);
DEFINE_CLK_SMD_RPM_BRANCH(qdss, QCOM_SMD_RPM_MISC_CLK, 1, 19200000);
DEFINE_CLK_SMD_RPM_QDSS(qdss, QCOM_SMD_RPM_MISC_CLK, 1);
DEFINE_CLK_SMD_RPM_BRANCH_A(bimc_freq_log, QCOM_SMD_RPM_MISC_CLK, 4, 1, 0);

--
2.39.2