linux-kernel - [PATCH] mmc: sdhci-pci: Set PROBE_PREFER

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Date:   Fri, 28 Oct 2022 15:56:37 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH] mmc: sdhci-pci: Set PROBE_PREFER_ASYNCHRONOUS

This driver often takes on the order of 10ms to start, but in some cases
as much as 190ms. It shouldn't have many cross-device dependencies to
race with, nor racy access to shared state with other drivers, so this
should be a relatively low risk change. We've done similarly with a
variety of other MMC host drivers already.

This driver was pinpointed as part of a survey of top slowest initcalls
(i.e., are built in, and probing synchronously) on a lab of ChromeOS
systems.

Signed-off-by: Brian Norris <briannorris@...omium.org>
---

 drivers/mmc/host/sdhci-pci-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 34ea1acbb3cc..0449630acbb3 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -2281,7 +2281,8 @@ static struct pci_driver sdhci_driver = {
 	.probe =	sdhci_pci_probe,
 	.remove =	sdhci_pci_remove,
 	.driver =	{
-		.pm =   &sdhci_pci_pm_ops
+		.pm =   &sdhci_pci_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 };

-- 
2.38.1.273.g43a17bfeac-goog