[PATCH 0/1][SRU][K][L][M][OEM-6.1] FM350(mtk_t7xx) failed to suspend, or early wake while suspending

[AceLan Kao]

From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>

BugLink: https://launchpad.net/bugs/2020743

[Impact]
FM350(mtk_t7xx) can't suspend sometimes.

kernel: [ 12.917396] mtk_t7xx 0000:57:00.0: [PM] Exiting suspend, modem in invalid state
kernel: [ 12.917406] mtk_t7xx 0000:57:00.0: PM: pci_pm_suspend(): t7xx_pci_pm_suspend+0x0/0x20 [mtk_t7xx] returns -14
kernel: [ 12.917446] mtk_t7xx 0000:57:00.0: PM: dpm_run_callback(): pci_pm_suspend+0x0/0x1b0 returns -14
kernel: [ 12.917462] mtk_t7xx 0000:57:00.0: PM: failed to suspend async: error -14

[Fix]
The commit in v6.4-rc3 waits for the device to be ready before suspending.
ab87603b2511 net: wwan: t7xx: Ensure init is completed before system sleep

[Test]
Verified on the machine with FM350 wwan module.

[Where problems could occur]
If the wwan is not ready before the time is up, it results in -ETIMEDOUT.
However, in this scenario, we will encounter the same issue where the system
fails to enter suspend mode. Therefore, it will not introduce regressions
or new issues.

Kai-Heng Feng (1):
  net: wwan: t7xx: Ensure init is completed before system sleep

 drivers/net/wwan/t7xx/t7xx_pci.c | 18 ++++++++++++++++++
 drivers/net/wwan/t7xx/t7xx_pci.h |  1 +
 2 files changed, 19 insertions(+)

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2.34.1