Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
---
Changes in v2:
- Rewrite patch to use dev_pm_genpd_rpm_always_on in sdhci driver
  instead, after Ulf Hansson made me aware of its existence
- Link to v1: https://lore.kernel.org/r/20250408-rk3576-emmc-fix-v1-1-3009828b1b31@collabora.com
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 39 +++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/sizes.h>
@@ -787,6 +788,28 @@ static void dwcmshc_rk35xx_postinit(stru
 	}
 }
 
+static void dwcmshc_rk3576_postinit(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
+{
+	struct device *dev = mmc_dev(host->mmc);
+	int ret;
+
+	/*
+	 * This works around what appears to be a silicon bug, which makes the
+	 * PD_NVM power domain, which the sdhci controller on the RK3576 is in,
+	 * never come back the same way once it's turned off once. This can
+	 * happen during early kernel boot if no driver is using either PD_NVM
+	 * or its child power domain PD_SDGMAC for a short moment, leading to it
+	 * being turned off to save power. By keeping it on, sdhci suspending
+	 * won't lead to PD_NVM becoming a candidate for getting turned off.
+	 */
+	ret = dev_pm_genpd_rpm_always_on(dev, true);
+	if (ret && ret != -EOPNOTSUPP)
+		dev_warn(dev, "failed to set PD rpm always on, SoC may hang later: %pe\n",
+			 ERR_PTR(ret));
+
+	dwcmshc_rk35xx_postinit(host, dwc_priv);
+}
+
 static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -1218,6 +1241,18 @@ static const struct dwcmshc_pltfm_data s
 	.postinit = dwcmshc_rk35xx_postinit,
 };
 
+static const struct dwcmshc_pltfm_data sdhci_dwcmshc_rk3576_pdata = {
+	.pdata = {
+		.ops = &sdhci_dwcmshc_rk35xx_ops,
+		.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
+			  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
+		.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+			   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
+	},
+	.init = dwcmshc_rk35xx_init,
+	.postinit = dwcmshc_rk3576_postinit,
+};
+
 static const struct dwcmshc_pltfm_data sdhci_dwcmshc_th1520_pdata = {
 	.pdata = {
 		.ops = &sdhci_dwcmshc_th1520_ops,
@@ -1317,6 +1352,10 @@ static const struct of_device_id sdhci_d
 		.data = &sdhci_dwcmshc_rk35xx_pdata,
 	},
 	{
+		.compatible = "rockchip,rk3576-dwcmshc",
+		.data = &sdhci_dwcmshc_rk3576_pdata,
+	},
+	{
 		.compatible = "rockchip,rk3568-dwcmshc",
 		.data = &sdhci_dwcmshc_rk35xx_pdata,
 	},