target/linux/qualcommax/patches-6.1/0903-psci-dont-advertise-OSI-support-for-IPQ6018.patch

   1 From 563db68137475d011b355bfe674d1b7a24778091 Mon Sep 17 00:00:00 2001
   2 From: Robert Marko <robimarko@gmail.com>
   3 Date: Sat, 8 Oct 2022 22:26:31 +0200
   4 Subject: [PATCH] psci: dont advertise OSI support for IPQ6018
   5
   6 Some older IPQ60xx SoC series boards ship with TrustZone/QSEE firmware
   7 older than TZ.WNS.5.1-00084 which will advertise OSI[1] but are broken
   8 and trying to use OSI will cause the board to hang until WDT kicks in.
   9
  10 So workaround it by checking for SoC compatible and returning false so
  11 OSI is not used.
  12
  13 [1] https://www.spinics.net/lists/linux-arm-msm/msg79916.html
  14
  15 Signed-off-by: Robert Marko <robimarko@gmail.com>
  16 ---
  17  drivers/firmware/psci/psci.c | 12 ++++++++++++
  18  1 file changed, 12 insertions(+)
  19
  20 --- a/drivers/firmware/psci/psci.c
  21 +++ b/drivers/firmware/psci/psci.c
  22 @@ -87,6 +87,18 @@ static inline bool psci_has_ext_power_st
  23
  24  bool psci_has_osi_support(void)
  25  {
  26 +       /*
  27 +        * Some older IPQ60xx SoC series boards ship with
  28 +        * TrustZone/QSEE firmware older than TZ.WNS.5.1-00084
  29 +        * which will advertise OSI but is broken and trying
  30 +        * to use OSI will cause the board to hang until WDT
  31 +        * kicks in.
  32 +        * So workaround it by checking for SoC compatible
  33 +        * and returning false so OSI is not used.
  34 +        */
  35 +       if (of_machine_is_compatible("qcom,ipq6018"))
  36 +               return false;
  37 +
  38         return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
  39  }
  40