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authorWenbin Mei <wenbin.mei@mediatek.com>2020-11-18 09:34:05 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2020-11-23 16:42:56 +0300
commitc0a2074ac575fff2848c8ef804bdc8590466c36c (patch)
tree43d976e285d291e467afaa104de0fbc643ea25d9 /drivers/mmc/host/mtk-sd.c
parentd06d60d52ec0b0eef702dd3e7b4699f0b589ad0f (diff)
downloadlinux-c0a2074ac575fff2848c8ef804bdc8590466c36c.tar.xz
mmc: mediatek: Fix system suspend/resume support for CQHCI
Before we got these errors on MT8192 platform: [ 59.153891] Restarting tasks ... [ 59.154540] done. [ 59.159175] PM: suspend exit [ 59.218724] mtk-msdc 11f60000.mmc: phase: [map:fffffffe] [maxlen:31] [final:16] [ 119.776083] mmc0: cqhci: timeout for tag 9 [ 119.780196] mmc0: cqhci: ============ CQHCI REGISTER DUMP =========== [ 119.786709] mmc0: cqhci: Caps: 0x100020b6 | Version: 0x00000510 [ 119.793225] mmc0: cqhci: Config: 0x00000101 | Control: 0x00000000 [ 119.799706] mmc0: cqhci: Int stat: 0x00000000 | Int enab: 0x00000000 [ 119.806177] mmc0: cqhci: Int sig: 0x00000000 | Int Coal: 0x00000000 [ 119.812670] mmc0: cqhci: TDL base: 0x00000000 | TDL up32: 0x00000000 [ 119.819149] mmc0: cqhci: Doorbell: 0x003ffc00 | TCN: 0x00000200 [ 119.825656] mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00000000 [ 119.832155] mmc0: cqhci: Task clr: 0x00000000 | SSC1: 0x00001000 [ 119.838627] mmc0: cqhci: SSC2: 0x00000000 | DCMD rsp: 0x00000000 [ 119.845174] mmc0: cqhci: RED mask: 0xfdf9a080 | TERRI: 0x0000891c [ 119.851654] mmc0: cqhci: Resp idx: 0x00000000 | Resp arg: 0x00000000 [ 119.865773] mmc0: cqhci: : =========================================== [ 119.872358] mmc0: running CQE recovery From these logs, we found TDL base was back to the default value. After suspend, the mmc host is powered off by HW, and bring CQE register to the default value, so we add system suspend/resume interface, then bring CQE to deactivated state before suspend, it will be enabled by CQE first request after resume. Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com> Link: https://lore.kernel.org/r/20201118063405.24906-1-wenbin.mei@mediatek.com Fixes: 88bd652b3c74 ("mmc: mediatek: command queue support") Cc: stable@vger.kernel.org [Ulf: Renamed functions] Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/mtk-sd.c')
-rw-r--r--drivers/mmc/host/mtk-sd.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index a704745e5882..b40ec966288e 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2681,11 +2681,29 @@ static int msdc_runtime_resume(struct device *dev)
msdc_restore_reg(host);
return 0;
}
+
+static int msdc_suspend(struct device *dev)
+{
+ struct mmc_host *mmc = dev_get_drvdata(dev);
+ int ret;
+
+ if (mmc->caps2 & MMC_CAP2_CQE) {
+ ret = cqhci_suspend(mmc);
+ if (ret)
+ return ret;
+ }
+
+ return pm_runtime_force_suspend(dev);
+}
+
+static int msdc_resume(struct device *dev)
+{
+ return pm_runtime_force_resume(dev);
+}
#endif
static const struct dev_pm_ops msdc_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
- pm_runtime_force_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(msdc_suspend, msdc_resume)
SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
};