linux-kernel - [PATCH 2/3] mmc: mtk-sd: add support for SPM resource release control

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Message-Id: <20251203-mt8189-add-mmc-support-v1-2-f5ce43212fe9@collabora.com>
Date: Wed, 03 Dec 2025 12:45:35 +0100
From: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
To: Chaotian Jing <chaotian.jing@...iatek.com>, 
 Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Wenbin Mei <wenbin.mei@...iatek.com>
Cc: kernel@...labora.com, linux-mmc@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
Subject: [PATCH 2/3] mmc: mtk-sd: add support for SPM resource release
 control

The MT8189 SoC has in the status register an additional bit field to
release all System Power management (SPM) resource requests.
In preparation of MT8189 SoC support, add its use in suspend callback
and a support flag in the platform data.

Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
---
 drivers/mmc/host/mtk-sd.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index daed659f63f6872423edd755478f0ec57e7742b4..4ce596d616409646613748086476c58d8b7b8de9 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -203,9 +203,10 @@
 #define SDC_CFG_DTOC            GENMASK(31, 24)	/* RW */
 
 /* SDC_STS mask */
-#define SDC_STS_SDCBUSY         BIT(0)	/* RW */
-#define SDC_STS_CMDBUSY         BIT(1)	/* RW */
-#define SDC_STS_SWR_COMPL       BIT(31)	/* RW */
+#define SDC_STS_SDCBUSY			BIT(0)  /* RW */
+#define SDC_STS_CMDBUSY			BIT(1)  /* RW */
+#define SDC_STS_SPM_RESOURCE_RELEASE	BIT(3)  /* RW */
+#define SDC_STS_SWR_COMPL		BIT(31) /* RW */
 
 /* SDC_ADV_CFG0 mask */
 #define SDC_DAT1_IRQ_TRIGGER	BIT(19)	/* RW */
@@ -448,6 +449,7 @@ struct mtk_mmc_compatible {
 	bool use_internal_cd;
 	bool support_new_tx;
 	bool support_new_rx;
+	bool support_spm_res_release;
 };
 
 struct msdc_tune_para {
@@ -3296,6 +3298,10 @@ static int msdc_runtime_suspend(struct device *dev)
 
 		__msdc_enable_sdio_irq(host, 0);
 	}
+
+	if (host->dev_comp->support_spm_res_release)
+		sdr_set_bits(host->base + SDC_STS, SDC_STS_SPM_RESOURCE_RELEASE);
+
 	msdc_gate_clock(host);
 	return 0;
 }

-- 
2.52.0