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hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/phy/rockchip/phy-rockchip-emmc.c
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@@ -1,17 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Rockchip emmc PHY driver
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  *
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  * Copyright (C) 2016 Shawn Lin <shawn.lin@rock-chips.com>
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  * Copyright (C) 2016 ROCKCHIP, Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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8
 
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 #include <linux/clk.h>
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@@ -87,6 +79,7 @@
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 	unsigned int	reg_offset;
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 	struct regmap	*reg_base;
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 	struct clk	*emmcclk;
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+	unsigned int drive_impedance;
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 };
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 static int rockchip_emmc_phy_power(struct phy *phy, bool on_off)
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@@ -176,7 +169,7 @@
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 	ret = regmap_read_poll_timeout(rk_phy->reg_base,
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 				       rk_phy->reg_offset + GRF_EMMCPHY_STATUS,
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 				       caldone, PHYCTRL_IS_CALDONE(caldone),
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-				       0, 500);
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+				       0, 50);
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 	if (ret) {
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 		pr_err("%s: caldone failed, ret=%d\n", __func__, ret);
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 		return ret;
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@@ -247,15 +240,17 @@
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 	 * - SDHCI driver to get the PHY
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 	 * - SDHCI driver to init the PHY
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 	 *
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-	 * The clock is optional, so upon any error we just set to NULL.
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+	 * The clock is optional, using clk_get_optional() to get the clock
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+	 * and do error processing if the return value != NULL
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 	 *
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 	 * NOTE: we don't do anything special for EPROBE_DEFER here.  Given the
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 	 * above expected use case, EPROBE_DEFER isn't sensible to expect, so
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 	 * it's just like any other error.
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 	 */
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-	rk_phy->emmcclk = clk_get(&phy->dev, "emmcclk");
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+	rk_phy->emmcclk = clk_get_optional(&phy->dev, "emmcclk");
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 	if (IS_ERR(rk_phy->emmcclk)) {
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-		dev_dbg(&phy->dev, "Error getting emmcclk: %d\n", ret);
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+		ret = PTR_ERR(rk_phy->emmcclk);
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+		dev_err(&phy->dev, "Error getting emmcclk: %d\n", ret);
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 		rk_phy->emmcclk = NULL;
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 	}
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@@ -281,10 +276,10 @@
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 {
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 	struct rockchip_emmc_phy *rk_phy = phy_get_drvdata(phy);
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-	/* Drive impedance: 50 Ohm */
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+	/* Drive impedance: from DTS */
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 	regmap_write(rk_phy->reg_base,
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 		     rk_phy->reg_offset + GRF_EMMCPHY_CON6,
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-		     HIWORD_UPDATE(PHYCTRL_DR_50OHM,
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+		     HIWORD_UPDATE(rk_phy->drive_impedance,
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 				   PHYCTRL_DR_MASK,
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 				   PHYCTRL_DR_SHIFT));
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@@ -314,6 +309,26 @@
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 	.owner		= THIS_MODULE,
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 };
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+static u32 convert_drive_impedance_ohm(struct platform_device *pdev, u32 dr_ohm)
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+{
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+	switch (dr_ohm) {
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+	case 100:
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+		return PHYCTRL_DR_100OHM;
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+	case 66:
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+		return PHYCTRL_DR_66OHM;
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+	case 50:
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+		return PHYCTRL_DR_50OHM;
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+	case 40:
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+		return PHYCTRL_DR_40OHM;
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+	case 33:
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+		return PHYCTRL_DR_33OHM;
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+	}
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+
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+	dev_warn(&pdev->dev, "Invalid value %u for drive-impedance-ohm.\n",
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+		 dr_ohm);
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+	return PHYCTRL_DR_50OHM;
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+}
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+
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 static int rockchip_emmc_phy_probe(struct platform_device *pdev)
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 {
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 	struct device *dev = &pdev->dev;
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@@ -322,6 +337,7 @@
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 	struct phy_provider *phy_provider;
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 	struct regmap *grf;
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 	unsigned int reg_offset;
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+	u32 val;
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 	if (!dev->parent || !dev->parent->of_node)
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 		return -ENODEV;
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@@ -337,13 +353,17 @@
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 		return -ENOMEM;
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 	if (of_property_read_u32(dev->of_node, "reg", &reg_offset)) {
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-		dev_err(dev, "missing reg property in node %s\n",
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-			dev->of_node->name);
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+		dev_err(dev, "missing reg property in node %pOFn\n",
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+			dev->of_node);
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 		return -EINVAL;
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 	}
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 	rk_phy->reg_offset = reg_offset;
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 	rk_phy->reg_base = grf;
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+	rk_phy->drive_impedance = PHYCTRL_DR_50OHM;
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+
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+	if (!of_property_read_u32(dev->of_node, "drive-impedance-ohm", &val))
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+		rk_phy->drive_impedance = convert_drive_impedance_ohm(pdev, val);
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 	generic_phy = devm_phy_create(dev, dev->of_node, &ops);
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 	if (IS_ERR(generic_phy)) {