[PATCH] mmc: sdhci-omap: re-tuning is needed after a pm transition to support emmc HS200 mode

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From: Romain Naour <romain.naour@xxxxxxx>

"PM runtime functions" has been added in sdhci-omap driver in 5.16
f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions") along
with "card power off and enable aggressive PM" 3edf588e7fe0
("mmc: sdhci-omap: Allow SDIO card power off and enable aggressive PM").

Since then, the sdhci-omap driver doesn't work using mmc-hs200 mode
due to the tuning values being lost during a pm transition.
See the report on the linux-omap mailing list [1].

As for the sdhci_am654 driver, request a new tuning sequence before
suspend (sdhci_omap_runtime_suspend()), othwerwise the device will
thigger cache flush errors:

  mmc1: cache flush error -110 (ETIMEDOUT)
  mmc1: error -110 doing aggressive suspend

followed by I/O errors produced by fdisk -l /dev/mmcblk1boot1:

  I/O error, dev mmcblk1boot0, sector 64384 op 0x0:(READ) flags 0x80700 phys_seg 1
  prio class 2
  I/O error, dev mmcblk1boot1, sector 64384 op 0x0:(READ) flags 0x80700 phys_seg 1
  prio class 2
  I/O error, dev mmcblk1boot1, sector 64384 op 0x0:(READ) flags 0x0 phys_seg 1
  prio class 2
  Buffer I/O error on dev mmcblk1boot1, logical block 8048, async page read
  I/O error, dev mmcblk1boot0, sector 64384 op 0x0:(READ) flags 0x0 phys_seg 1
  prio class 2
  Buffer I/O error on dev mmcblk1boot0, logical block 8048, async page read

Don't re-tune if auto retuning is supported in HW (when SDHCI_TUNING_MODE_3
is available).

[1] https://lore.kernel.org/all/2e5f1997-564c-44e4-b357-6343e0dae7ab@xxxxxxxx

Fixes: f433e8aac6b9 ("mmc: sdhci-omap: Implement PM runtime functions")
Signed-off-by: Romain Naour <romain.naour@xxxxxxx>
---
 drivers/mmc/host/sdhci-omap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index e78faef67d7a..94076b095571 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -1439,6 +1439,9 @@ static int __maybe_unused sdhci_omap_runtime_suspend(struct device *dev)
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
 
+	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
+		mmc_retune_needed(host->mmc);
+
 	if (omap_host->con != -EINVAL)
 		sdhci_runtime_suspend_host(host);
 
-- 
2.43.2





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