linux-kernel - [PATCH v3] mmc: sdhci-of-arasan: Add shutdown callback

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Message-ID: <20250612054136.5860-1-alvin.paulp@amd.com>
Date: Thu, 12 Jun 2025 11:11:36 +0530
From: Paul Alvin <alvin.paulp@....com>
To: <michal.simek@....com>, <adrian.hunter@...el.com>,
	<ulf.hansson@...aro.org>
CC: <git@....com>, <alvin.paulp@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v3] mmc: sdhci-of-arasan: Add shutdown callback

Implement shutdown hook to ensure proper host shutdown by using sdhci
platform suspend. This ensure a safe transition when the Kexec utility
calls the shutdown hook, facilitating seamless loading and booting of
a new kernel from the currently running one.

Signed-off-by: Paul Alvin <alvin.paulp@....com>
---

Changes in v3:
- Updated commit description.

Changes in v2:
- Make use of platform suspend instead of driver suspend as driver
  suspend will only get defined if PMC_SLEEP is configured which
  results in build failure if it is not configured.
- Updated commit description.

 drivers/mmc/host/sdhci-of-arasan.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 8c29676ab662..4abdad3c4e5b 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -2056,6 +2056,11 @@ static void sdhci_arasan_remove(struct platform_device *pdev)
 	clk_disable_unprepare(clk_ahb);
 }
 
+static void sdhci_arasan_shutdown(struct platform_device *pdev)
+{
+	sdhci_pltfm_suspend(&pdev->dev);
+}
+
 static struct platform_driver sdhci_arasan_driver = {
 	.driver = {
 		.name = "sdhci-arasan",
@@ -2065,6 +2070,7 @@ static struct platform_driver sdhci_arasan_driver = {
 	},
 	.probe = sdhci_arasan_probe,
 	.remove = sdhci_arasan_remove,
+	.shutdown = sdhci_arasan_shutdown,
 };
 
 module_platform_driver(sdhci_arasan_driver);
-- 
2.17.1