[PATCH AUTOSEL 4.14 15/73] mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01

[Sasha Levin <sashal@kernel.org>]

From: Yu Zhao <yuzhao@google.com>

[ Upstream commit 5169894982bb67486d93cc1e10151712bb86bcb6 ]

This device reports SDHCI_CLOCK_INT_STABLE even though it's not
ready to take SDHCI_CLOCK_CARD_EN. The symptom is that reading
SDHCI_CLOCK_CONTROL after enabling the clock shows absence of the
bit from the register (e.g. expecting 0x0000fa07 = 0x0000fa03 |
SDHCI_CLOCK_CARD_EN but only observed the first operand).

mmc1: Timeout waiting for hardware cmd interrupt.
mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00000603
mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
mmc1: sdhci: Present:   0x01ff0001 | Host ctl: 0x00000001
mmc1: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000fa03
mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
mmc1: sdhci: Int enab:  0x00ff0083 | Sig enab: 0x00ff0083
mmc1: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
mmc1: sdhci: Caps:      0x25fcc8bf | Caps_1:   0x00002077
mmc1: sdhci: Cmd:       0x00000000 | Max curr: 0x005800c8
mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
mmc1: sdhci: Host ctl2: 0x00000008
mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x00000000
mmc1: sdhci: ============================================

The problem happens during wakeup from S3. Adding a delay quirk
after power up reliably fixes the problem.

Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mmc/host/sdhci-pci-o2micro.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index 14273ca00641..44a809a20d3a 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -334,6 +334,9 @@ int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
 		pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
 		break;
 	case PCI_DEVICE_ID_O2_SEABIRD0:
+		if (chip->pdev->revision == 0x01)
+			chip->quirks |= SDHCI_QUIRK_DELAY_AFTER_POWER;
+		/* fall through */
 	case PCI_DEVICE_ID_O2_SEABIRD1:
 		/* UnLock WP */
 		ret = pci_read_config_byte(chip->pdev,
-- 
2.17.1