[PATCH v2 0/5] mmc: sdhci-esdhc-imx: fix SDIO suspend/resume issues

[ziniu . wang_1]

From: Luke Wang <ziniu.wang_1@xxxxxxx>

This series fixes several issues with SDIO suspend/resume on i.MX
platforms using the sdhci-esdhc-imx driver:

1. Remove unnecessary mmc_card_wake_sdio_irq() check that prevented
   tuning save/restore for non-SDIO cards that keep power during PM.

2. Restore DLL override settings for DDR50/DDR52 modes on resume,
   since sdhci_esdhc_imx_hwinit() unconditionally clears ESDHC_DLL_CTRL.

3. Restore pinctrl state based on current timing mode before
   pm_runtime_force_resume() on resume. Only for non-wakeup devices
   to avoid glitching SD bus pins for powered SDIO cards.

4. Move disable_irq() before the wakeup check in suspend to prevent
   unhandled interrupts during the suspend sequence.

5. Fix error handling in suspend/resume paths: use
   pm_runtime_resume_and_get(), make non-critical failures non-fatal,
   and properly handle pm_runtime_force_resume() failure.

Changes since v1:
- Added patch 5 to fix error handling issues identified during review
- Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync()
- Make pinctrl and cd-wake failures non-fatal (dev_warn only)
- Use esdhc_change_pinstate() instead of pinctrl_pm_select_default_state()
  in resume to restore correct pin state based on timing mode
- Skip pinctrl restore for wakeup devices to avoid SD bus glitch
- Check pm_runtime_force_resume() return value in resume

Luke Wang (5):
  mmc: sdhci-esdhc-imx: remove unnecessary mmc_card_wake_sdio_irq check
    for tuning save/restore
  mmc: sdhci-esdhc-imx: restore DLL override for DDR modes on resume
  mmc: sdhci-esdhc-imx: restore pinctrl before restoring ios timing on
    resume
  mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled
    interrupt
  mmc: sdhci-esdhc-imx: fix suspend/resume error handling

 drivers/mmc/host/sdhci-esdhc-imx.c | 75 ++++++++++++++++++++----------
 1 file changed, 51 insertions(+), 24 deletions(-)

-- 
2.34.1