From: Yu Zhao <yuzhao@google.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Yu Zhao <yuzhao@google.com>
Subject: [PATCH] mmc: add quirk for O2 Micro dev 0x8620 rev 0x01
Date: Sun, 23 Sep 2018 14:39:24 -0600 [thread overview]
Message-ID: <20180923203924.68452-1-yuzhao@google.com> (raw)
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>
---
drivers/mmc/host/sdhci-pci-o2micro.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index 77e9bc4aaee9..3e5ecf7ce101 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -490,6 +490,8 @@ 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;
case PCI_DEVICE_ID_O2_SEABIRD1:
/* UnLock WP */
ret = pci_read_config_byte(chip->pdev,
--
2.19.0.444.g18242da7ef-goog
next reply other threads:[~2018-09-23 20:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-23 20:39 Yu Zhao [this message]
2018-09-26 23:48 ` [PATCH] mmc: add quirk for O2 Micro dev 0x8620 rev 0x01 Ulf Hansson
2018-09-27 1:40 ` Yu Zhao
2018-09-27 12:11 ` Ulf Hansson
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