[PATCH 6/7] mmc: core: Implement content of UHS-II card initialization functions

* [PATCH 6/7] mmc: core: Implement content of UHS-II card initialization functions
@ 2021-08-31 11:02 Jason Lai
  2021-09-01  2:54 ` AKASHI Takahiro
  2021-09-09 14:28 ` Ulf Hansson
  0 siblings, 2 replies; 5+ messages in thread
From: Jason Lai @ 2021-08-31 11:02 UTC (permalink / raw)
  To: ulf.hansson, takahiro.akashi, adrian.hunter
  Cc: Jason Lai, linux-mmc, ben.chuang, greg.tu

From: Jason Lai <jason.lai@genesyslogic.com.tw>

From: Jason Lai <jason.lai@genesyslogic.com.tw>

UHS-II card initialization flow is divided into 2 categories: PHY & Card.
Part 1 - PHY Initialization:
         Every host controller may need their own avtivation operation
         to establish LINK between controller and card. So we add a new
         member function(uhs2_detect_init) in struct mmc_host_ops for host
         controller use.
Part 2 - Card Initialization:
         This part can be divided into 6 substeps.
         1. Send UHS-II CCMD DEVICE_INIT to card.
         2. Send UHS-II CCMD ENUMERATE to card.
         3. Send UHS-II Native Read CCMD to obtain capabilities in CFG_REG
            of card.
         4. Host compares capabilities of host controller and  card,
	    then write the negotiated values to Setting field in CFG_REG
            of card through UHS-II Native Write CCMD.
         5. Switch host controller's clock to Range B if it is supported
	    by both host controller and card.
         6. Execute legacy SD initialization flow.

Signed-off-by: Jason Lai <jason.lai@genesyslogic.com.tw>
---
 drivers/mmc/core/sd_uhs2.c | 918 +++++++++++++++++++++++++++++++++++--
 1 file changed, 868 insertions(+), 50 deletions(-)

diff --git a/drivers/mmc/core/sd_uhs2.c b/drivers/mmc/core/sd_uhs2.c
index 24aa51a6d..d9ceee20d 100644
--- a/drivers/mmc/core/sd_uhs2.c
+++ b/drivers/mmc/core/sd_uhs2.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2021 Linaro Ltd
  *
  * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ * Author: Jason Lai <jason.lai@genesyslogic.com.tw>
  *
  * Support for SD UHS-II cards
  */
@@ -10,29 +11,37 @@
 
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/sd_uhs2.h>
 
 #include "core.h"
 #include "bus.h"
 #include "sd.h"
 #include "mmc_ops.h"
+#include "sd_uhs2.h"
 
 static const unsigned int sd_uhs2_freqs[] = { 52000000, 26000000 };
 
-static int sd_uhs2_set_ios(struct mmc_host *host)
+static void sd_uhs2_set_ios(struct mmc_host *host)
 {
 	struct mmc_ios *ios = &host->ios;
 
-	return host->ops->uhs2_set_ios(host, ios);
+	pr_debug("%s: clock=%uHz, bus_mode=%u, power_mode=%u, ",
+		 mmc_hostname(host), ios->clock, ios->bus_mode,
+		 ios->power_mode);
+	pr_debug("cs=%u, Vdd=%u, width=%u, timing=%u\n",
+		 ios->chip_select, ios->vdd, 1 << ios->bus_width,
+		 ios->timing);
+
+	host->ops->uhs2_set_ios(host, ios);
 }
 
-static int sd_uhs2_power_up(struct mmc_host *host)
+static void sd_uhs2_power_up(struct mmc_host *host)
 {
 	host->ios.vdd = fls(host->ocr_avail) - 1;
 	host->ios.clock = host->f_init;
 	host->ios.timing = MMC_TIMING_SD_UHS2;
 	host->ios.power_mode = MMC_POWER_UP;
 
-	return sd_uhs2_set_ios(host);
+	sd_uhs2_set_ios(host);
 }
 
 static void sd_uhs2_power_off(struct mmc_host *host)
@@ -45,6 +54,43 @@ static void sd_uhs2_power_off(struct mmc_host *host)
 	sd_uhs2_set_ios(host);
 }
 
+/*
+ * uhs2_cmd_assemble - assemble and build up uhs2 command
+ * @cmd:	MMC command
+ * @uhs2_cmd:	UHS2 command
+ * @header:	Value of packet header
+ * @arg:	Argument of packet
+ * @payload:	Payload of packet
+ * @plen:	Payload length
+ * @resp:	Buffer for response
+ * @resp_len:	Response buffer length
+ *
+ * resp is inputted outside which should be a variable created by caller
+ * so caller should handle it. For SD command, there is no uhs2_resp and
+ * response should be stored in resp of mmc_command.
+ */
+static void uhs2_cmd_assemble(struct mmc_command *cmd,
+			      struct uhs2_command *uhs2_cmd,
+			      u16 header, u16 arg,
+			      u32 *payload, u8 plen, u8 *resp, u8 resp_len)
+{
+	uhs2_cmd->header = header;
+	uhs2_cmd->arg = arg;
+	uhs2_cmd->payload = payload;
+	uhs2_cmd->payload_len = plen * sizeof(u32);
+	uhs2_cmd->packet_len = uhs2_cmd->payload_len + 4;
+
+	cmd->uhs2_cmd = uhs2_cmd;
+	cmd->uhs2_resp = resp;
+	cmd->uhs2_resp_len = resp_len;
+
+	pr_debug("%s: uhs2_cmd: header=0x%x arg=0x%x\n",
+		 __func__, uhs2_cmd->header, uhs2_cmd->arg);
+	pr_debug("%s:           payload_len=%d packet_len=%d resp_len=%d\n",
+		 __func__, uhs2_cmd->payload_len, uhs2_cmd->packet_len,
+		 cmd->uhs2_resp_len);
+}
+
 /*
  * Run the phy initialization sequence, which mainly relies on the UHS-II host
  * to check that we reach the expected electrical state, between the host and
@@ -52,16 +98,104 @@ static void sd_uhs2_power_off(struct mmc_host *host)
  */
 static int sd_uhs2_phy_init(struct mmc_host *host)
 {
+	int err = 0;
+
+	/*
+	 * Every host controller can assign its own function which is used
+	 * to initialize PHY.
+	 */
+	if (host->ops->uhs2_detect_init) {
+		err = host->ops->uhs2_detect_init(host)
+		if (err) {
+			pr_err("%s: fail to detect UHS2!\n",
+			       mmc_hostname(host));
+			err = UHS2_PHY_INIT_ERR;
+		}
+	}
+
 	return 0;
 }
 
 /*
  * Do the early initialization of the card, by sending the device init
-roadcast
- * command and wait for the process to be completed.
+ * broadcast command and wait for the process to be completed.
  */
 static int sd_uhs2_dev_init(struct mmc_host *host)
 {
+	struct mmc_command cmd = {0};
+	struct uhs2_command uhs2_cmd = {};
+	u32 cnt;
+	u32 dap, gap, gap1;
+	u16 header = 0, arg = 0;
+	u32 payload[1];
+	u8 plen = 1;
+	u8 gd = 0, cf = 1;
+	u8 resp[6] = {0};
+	u8 resp_len = 6;
+	int err;
+
+	dap = host->uhs2_caps.dap;
+	gap = host->uhs2_caps.gap;
+
+	header = UHS2_NATIVE_PACKET | UHS2_PACKET_TYPE_CCMD;
+	arg = ((UHS2_DEV_CMD_DEVICE_INIT & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_4B |
+		(UHS2_DEV_CMD_DEVICE_INIT >> 8);
+
+	/* need this for some cards */
+	cmd.busy_timeout = 1000;
+
+	for (cnt = 0; cnt < 30; cnt++) {
+		payload[0] = ((dap & 0xF) << 12) |
+			(cf << 11)         |
+			((gd & 0xF) << 4)  |
+			(gap & 0xF);
+
+		uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg,
+				  payload, plen, resp, resp_len);
+
+		DBG("Begin DEVICE_INIT, header=0x%x, arg=0x%x, payload=0x%x.\n",
+		    header, arg, payload[0]);
+
+		DBG("Sending DEVICE_INIT. Count = %d\n", cnt);
+		err = mmc_wait_for_cmd(host, &cmd, 0);
+
+		if (err) {
+			pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+			       mmc_hostname(host), __func__, err);
+			return -EIO;
+		}
+
+		if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+			int i;
+
+			pr_warn("%s: DEVICE_INIT response is: ",
+				mmc_hostname(host));
+			for (i = 0; i < resp_len; i++)
+				pr_warn("0x%x ", resp[i]);
+			pr_warn("\n");
+		}
+
+		if (resp[3] != (UHS2_DEV_CMD_DEVICE_INIT & 0xFF)) {
+			pr_err("%s: DEVICE_INIT response is wrong!\n",
+			       mmc_hostname(host));
+			return -EIO;
+		}
+
+		if (resp[5] & 0x8) {
+			DBG("CF is set, device is initialized!\n");
+			host->group_desc = gd;
+			break;
+		}
+		gap1 = resp[4] & 0x0F;
+		if (gap == gap1)
+			gd++;
+	}
+	if (cnt == 30) {
+		pr_err("%s: DEVICE_INIT fail, already 30 times!\n",
+		       mmc_hostname(host));
+		return -EIO;
+	}
+
 	return 0;
 }
 
@@ -70,8 +204,60 @@ static int sd_uhs2_dev_init(struct mmc_host *host)
  * Note that, we currently support only the point to point connection, which
  * means only one card can be attached per host/slot.
  */
-static int sd_uhs2_enum(struct mmc_host *host, u32 *node_id)
+static int sd_uhs2_enum(struct mmc_host *host)
 {
+	struct mmc_command cmd = {0};
+	struct uhs2_command uhs2_cmd = {};
+	u16 header = 0, arg = 0;
+	u32 payload[1];
+	u8 plen = 1;
+	u8 id_f = 0xF, id_l = 0x0;
+	u8 resp[8] = {0};
+	u8 resp_len = 8;
+	int err;
+
+	header = UHS2_NATIVE_PACKET | UHS2_PACKET_TYPE_CCMD;
+	arg = ((UHS2_DEV_CMD_ENUMERATE & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_4B |
+		(UHS2_DEV_CMD_ENUMERATE >> 8);
+
+	payload[0] = (id_f << 4) | id_l;
+
+	DBG("Begin ENUMERATE, header=0x%x, arg=0x%x, payload=0x%x.\n",
+	    header, arg, payload[0]);
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, payload, plen,
+			  resp, resp_len);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+		int i;
+
+		pr_warn("%s: ENUMERATE response is: ", mmc_hostname(host));
+		for (i = 0; i < resp_len; i++)
+			pr_warn("0x%x ", resp[i]);
+		pr_warn("\n");
+	}
+
+	if (resp[3] != (UHS2_DEV_CMD_ENUMERATE & 0xFF)) {
+		pr_err("%s: ENUMERATE response is wrong!\n",
+		       mmc_hostname(host));
+		return -EIO;
+	}
+
+	id_f = (resp[4] >> 4) & 0xF;
+	id_l = resp[4] & 0xF;
+	DBG("id_f = %d, id_l = %d.\n", id_f, id_l);
+	DBG("Enumerate Cmd Completed. No. of Devices connected = %d\n",
+	    id_l - id_f + 1);
+	host->uhs2_dev_prop.node_id = id_f;
+
 	return 0;
 }
 
@@ -80,8 +266,158 @@ static int sd_uhs2_enum(struct mmc_host *host, u32 *node_id)
  * commands and by parsing the responses. Store a copy of the relevant data in
  * card->uhs2_config.
  */
-static int sd_uhs2_config_read(struct mmc_host *host, struct mmc_card *card)
+static int sd_uhs2_config_read(struct mmc_host *host)
 {
+	struct mmc_command cmd = {0};
+	struct uhs2_command uhs2_cmd = {};
+	u16 header = 0, arg = 0;
+	u32 cap;
+	int err;
+
+	DBG("INQUIRY_CFG: read Generic Caps.\n");
+	header = UHS2_NATIVE_PACKET |
+		 UHS2_PACKET_TYPE_CCMD |
+		 host->uhs2_dev_prop.node_id;
+	arg = ((UHS2_DEV_CONFIG_GEN_CAPS & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_READ |
+		UHS2_NATIVE_CMD_PLEN_4B |
+		(UHS2_DEV_CONFIG_GEN_CAPS >> 8);
+
+	pr_debug("Begin INQUIRY_CFG, header=0x%x, arg=0x%x.\n", header, arg);
+	/* There is no payload because per spec, there should be
+	 * no payload field for read CCMD.
+	 * Plen is set in arg. Per spec, plen for read CCMD
+	 * represents the len of read data which is assigned in payload
+	 * of following RES (p136).
+	 */
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, NULL, 0, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+		int i;
+
+		pr_warn("%s: INQUIRY_CFG generic response is: ",
+			mmc_hostname(host));
+		for (i = 0; i < 2; i++)
+			pr_warn("0x%x ", cmd.resp[i]);
+		pr_warn("\n");
+	}
+
+	cap = cmd.resp[0];
+	pr_debug("Device Generic Caps (0-31) is: 0x%x.\n", cap);
+	host->uhs2_dev_prop.n_lanes = (cap >> UHS2_DEV_CONFIG_N_LANES_POS) &
+					UHS2_DEV_CONFIG_N_LANES_MASK;
+	host->uhs2_dev_prop.dadr_len = (cap >> UHS2_DEV_CONFIG_DADR_POS) &
+					UHS2_DEV_CONFIG_DADR_MASK;
+	host->uhs2_dev_prop.app_type = (cap >> UHS2_DEV_CONFIG_APP_POS) &
+					UHS2_DEV_CONFIG_APP_MASK;
+
+	pr_debug("INQUIRY_CFG: read PHY Caps.\n");
+	arg = ((UHS2_DEV_CONFIG_PHY_CAPS & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_READ |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_PHY_CAPS >> 8);
+
+	pr_debug("Begin INQUIRY_CFG, header=0x%x, arg=0x%x.\n", header, arg);
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, NULL, 0, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+		int i;
+
+		pr_warn("%s: INQUIRY_CFG PHY response is: ",
+			mmc_hostname(host));
+		for (i = 0; i < 2; i++)
+			pr_warn("0x%x ", cmd.resp[i]);
+		pr_warn("\n");
+	}
+
+	cap = cmd.resp[0];
+	pr_debug("Device PHY Caps (0-31) is: 0x%x.\n", cap);
+	host->uhs2_dev_prop.phy_minor_rev = cap &
+					UHS2_DEV_CONFIG_PHY_MINOR_MASK;
+	host->uhs2_dev_prop.phy_major_rev = (cap >>
+					UHS2_DEV_CONFIG_PHY_MAJOR_POS) &
+					UHS2_DEV_CONFIG_PHY_MAJOR_MASK;
+	host->uhs2_dev_prop.can_hibernate = (cap >>
+					UHS2_DEV_CONFIG_CAN_HIBER_POS) &
+					UHS2_DEV_CONFIG_CAN_HIBER_MASK;
+
+	cap = cmd.resp[1];
+	pr_debug("Device PHY Caps (32-63) is: 0x%x.\n", cap);
+	host->uhs2_dev_prop.n_lss_sync = cap & UHS2_DEV_CONFIG_N_LSS_SYN_MASK;
+	host->uhs2_dev_prop.n_lss_dir = (cap >>
+					UHS2_DEV_CONFIG_N_LSS_DIR_POS) &
+					UHS2_DEV_CONFIG_N_LSS_DIR_MASK;
+	if (host->uhs2_dev_prop.n_lss_sync == 0)
+		host->uhs2_dev_prop.n_lss_sync = 16 << 2;
+	else
+		host->uhs2_dev_prop.n_lss_sync <<= 2;
+
+	if (host->uhs2_dev_prop.n_lss_dir == 0)
+		host->uhs2_dev_prop.n_lss_dir = 16 << 3;
+	else
+		host->uhs2_dev_prop.n_lss_dir <<= 3;
+
+	pr_debug("INQUIRY_CFG: read LINK-TRAN Caps.\n");
+	arg = ((UHS2_DEV_CONFIG_LINK_TRAN_CAPS & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_READ |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_LINK_TRAN_CAPS >> 8);
+
+	pr_debug("Begin INQUIRY_CFG, header=0x%x, arg=0x%x.\n", header, arg);
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, NULL, 0, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	if (IS_ENABLED(CONFIG_MMC_DEBUG)) {
+		int i;
+
+		pr_warn("%s: INQUIRY_CFG Link-Tran response is: ",
+			mmc_hostname(host));
+		for (i = 0; i < 2; i++)
+			pr_warn("0x%x ", cmd.resp[i]);
+		pr_warn("\n");
+	}
+
+	cap = cmd.resp[0];
+	DBG("Device LINK-TRAN Caps (0-31) is: 0x%x.\n", cap);
+	host->uhs2_dev_prop.link_minor_rev = cap &
+					UHS2_DEV_CONFIG_LT_MINOR_MASK;
+	host->uhs2_dev_prop.link_major_rev = (cap >>
+					UHS2_DEV_CONFIG_LT_MAJOR_POS) &
+					UHS2_DEV_CONFIG_LT_MAJOR_MASK;
+	host->uhs2_dev_prop.n_fcu = (cap >> UHS2_DEV_CONFIG_N_FCU_POS) &
+					UHS2_DEV_CONFIG_N_FCU_MASK;
+	host->uhs2_dev_prop.dev_type = (cap >> UHS2_DEV_CONFIG_DEV_TYPE_POS) &
+					UHS2_DEV_CONFIG_DEV_TYPE_MASK;
+	host->uhs2_dev_prop.maxblk_len = (cap >>
+					UHS2_DEV_CONFIG_MAX_BLK_LEN_POS) &
+					UHS2_DEV_CONFIG_MAX_BLK_LEN_MASK;
+
+	cap = cmd.resp[1];
+	DBG("Device LINK-TRAN Caps (32-63) is: 0x%x.\n", cap);
+	host->uhs2_dev_prop.n_data_gap = cap & UHS2_DEV_CONFIG_N_DATA_GAP_MASK;
+	if (host->uhs2_dev_prop.n_fcu == 0)
+		host->uhs2_dev_prop.n_fcu = 256;
+
 	return 0;
 }
 
@@ -89,15 +425,393 @@ static int sd_uhs2_config_read(struct mmc_host *host, struct mmc_card *card)
  * Based on the card's and host's UHS-II capabilities, let's update the
  * configuration of the card and the host. This may also include to move to a
  * greater speed range/mode. Depending on the updated configuration, we may
-eed
- * to do a soft reset of the card via sending it a GO_DORMANT_STATE command.
+ * need to do a soft reset of the card via sending it a GO_DORMANT_STATE command.
  *
- * In the final step, let's check if the card signals "config completion",
-hich
- * indicates that the card has moved from config state into active state.
+ * In the final step, let's check if the card signals "config completion",
+ * which indicates that the card has moved from config state into active state.
  */
-static int sd_uhs2_config_write(struct mmc_host *host, struct mmc_card *card)
+static int sd_uhs2_config_write(struct mmc_host *host)
+{
+	struct mmc_command cmd = {0};
+	struct uhs2_command uhs2_cmd = {};
+	u16 header = 0, arg = 0;
+	u32 payload[2];
+	u8 nMinDataGap;
+	u8 plen;
+	u8 try;
+	int err;
+	u8 resp[5] = {0};
+	u8 resp_len = 5;
+
+	pr_debug("SET_COMMON_CFG: write Generic Settings.\n");
+	header = UHS2_NATIVE_PACKET |
+		 UHS2_PACKET_TYPE_CCMD | host->uhs2_dev_prop.node_id;
+	arg = ((UHS2_DEV_CONFIG_GEN_SET & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_GEN_SET >> 8);
+
+	if (host->uhs2_dev_prop.n_lanes == UHS2_DEV_CONFIG_2L_HD_FD &&
+	    host->uhs2_caps.n_lanes == UHS2_DEV_CONFIG_2L_HD_FD) {
+		/* Support HD */
+		pr_debug("Both Host and device support 2L-HD.\n");
+		host->flags |= MMC_UHS2_2L_HD;
+		host->uhs2_caps.n_lanes_set = UHS2_DEV_CONFIG_GEN_SET_2L_FD_HD;
+		host->uhs2_dev_prop.n_lanes_set =
+				UHS2_DEV_CONFIG_GEN_SET_2L_FD_HD;
+		nMinDataGap = 1;
+	} else {
+		/* Only support 2L-FD so far */
+		host->flags &= ~MMC_UHS2_2L_HD;
+		host->uhs2_caps.n_lanes_set = UHS2_DEV_CONFIG_GEN_SET_2L_FD_HD;
+		host->uhs2_dev_prop.n_lanes_set =
+				UHS2_DEV_CONFIG_GEN_SET_2L_FD_HD;
+		nMinDataGap = 3;
+	}
+
+	plen = 2;
+	payload[0] = host->uhs2_dev_prop.n_lanes_set <<
+		     UHS2_DEV_CONFIG_N_LANES_POS;
+	payload[1] = 0;
+	payload[0] = cpu_to_be32(payload[0]);
+	payload[1] = cpu_to_be32(payload[1]);
+
+	pr_debug("Begin SET_COMMON_CFG, header=0x%x, arg=0x%x\n", header, arg);
+	pr_debug("UHS2 write Generic Settings %08x %08x\n",
+		 payload[0], payload[1]);
+	pr_debug("flags=%08x, ", host->flags);
+	pr_debug("host_caps.n_lanes_set%x, ", host->uhs2_caps.n_lanes_set);
+	pr_debug("dev_prop.n_lanes_set=%x\n", host->uhs2_dev_prop.n_lanes_set);
+
+	/*
+	 * There is no payload because per spec, there should be
+	 * no payload field for read CCMD.
+	 * Plen is set in arg. Per spec, plen for read CCMD
+	 * represents the len of read data which is assigned in payload
+	 * of following RES (p136).
+	 */
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, payload, plen, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	pr_debug("SET_COMMON_CFG: PHY Settings.\n");
+	arg = ((UHS2_DEV_CONFIG_PHY_SET & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_PHY_SET >> 8);
+
+	for (try = 0; try < 2; try++) {
+		plen = 2;
+
+		if (host->uhs2_caps.speed_range ==
+			UHS2_DEV_CONFIG_PHY_SET_SPEED_B) {
+			host->flags |= MMC_UHS2_SPEED_B;
+			host->uhs2_dev_prop.speed_range_set =
+				UHS2_DEV_CONFIG_PHY_SET_SPEED_B;
+			pr_debug("set dev_prop.speed_range_set to SPEED_B\n");
+		} else {
+			host->uhs2_dev_prop.speed_range_set =
+				UHS2_DEV_CONFIG_PHY_SET_SPEED_A;
+			host->flags &= ~MMC_UHS2_SPEED_B;
+			pr_debug("set dev_prop.speed_range_set to SPEED_A\n");
+		}
+
+		payload[0] = host->uhs2_dev_prop.speed_range_set <<
+				UHS2_DEV_CONFIG_PHY_SET_SPEED_POS;
+
+		host->uhs2_dev_prop.n_lss_sync_set =
+			(min(host->uhs2_dev_prop.n_lss_sync,
+			host->uhs2_caps.n_lss_sync) >> 2) &
+			UHS2_DEV_CONFIG_N_LSS_SYN_MASK;
+		host->uhs2_caps.n_lss_sync_set =
+			host->uhs2_dev_prop.n_lss_sync_set;
+
+		if (try == 0) {
+			host->uhs2_caps.n_lss_dir_set =
+				(host->uhs2_dev_prop.n_lss_dir >> 3) &
+				UHS2_DEV_CONFIG_N_LSS_DIR_MASK;
+			host->uhs2_dev_prop.n_lss_dir_set =
+				((host->uhs2_caps.n_lss_dir >> 3) + 1) &
+				UHS2_DEV_CONFIG_N_LSS_DIR_MASK;
+		} else {
+			host->uhs2_dev_prop.n_lss_dir_set =
+				(max(host->uhs2_dev_prop.n_lss_dir,
+				host->uhs2_caps.n_lss_dir) >> 3) &
+				UHS2_DEV_CONFIG_N_LSS_DIR_MASK;
+			host->uhs2_caps.n_lss_dir_set =
+				host->uhs2_dev_prop.n_lss_dir_set;
+			payload[1] = (host->uhs2_dev_prop.n_lss_dir_set <<
+				UHS2_DEV_CONFIG_N_LSS_DIR_POS) |
+				host->uhs2_dev_prop.n_lss_sync_set;
+		}
+
+		payload[1] = (host->uhs2_dev_prop.n_lss_dir_set <<
+				UHS2_DEV_CONFIG_N_LSS_DIR_POS) |
+				host->uhs2_dev_prop.n_lss_sync_set;
+		payload[0] = cpu_to_be32(payload[0]);
+		payload[1] = cpu_to_be32(payload[1]);
+
+		pr_debug("UHS2 SET PHY Settings  %08x %08x\n",
+			 payload[0], payload[1]);
+		pr_debug("host->flags=%08x dev_prop.speed_range_set=%x\n",
+			 host->flags,
+			 host->uhs2_dev_prop.speed_range_set);
+		pr_debug("dev_prop.n_lss_sync_set=%x host_caps.n_lss_sync_set=%x\n",
+			 host->uhs2_dev_prop.n_lss_sync_set,
+			 host->uhs2_caps.n_lss_sync_set);
+		pr_debug("dev_prop.n_lss_dir_set=%x host_caps.n_lss_dir_set=%x\n",
+			 host->uhs2_dev_prop.n_lss_dir_set,
+			 host->uhs2_caps.n_lss_dir_set);
+
+		pr_debug("Begin SET_COMMON_CFG header=0x%x arg=0x%x\n",
+			 header, arg);
+		pr_debug("\t\tpayload[0]=0x%x payload[1]=0x%x\n",
+			 payload[0], payload[1]);
+
+		resp_len = 4;
+		memset(resp, 0, sizeof(resp));
+
+		uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg,
+				  payload, plen, resp, resp_len);
+
+		err = mmc_wait_for_cmd(host, &cmd, 0);
+		if (err) {
+			pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+			       mmc_hostname(host), __func__, err);
+			return -EIO;
+		}
+
+		if (!(resp[2] & 0x80))
+			break;
+
+		pr_debug("%s: %s: UHS2 SET PHY Settings fail, res= 0x%x!\n",
+			 mmc_hostname(host), __func__,  resp[2]);
+	}
+
+	pr_debug("SET_COMMON_CFG: LINK-TRAN Settings.\n");
+	arg = ((UHS2_DEV_CONFIG_LINK_TRAN_SET & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_LINK_TRAN_SET >> 8);
+
+	plen = 2;
+
+	if (host->uhs2_dev_prop.app_type == UHS2_DEV_CONFIG_APP_SD_MEM)
+		host->uhs2_dev_prop.maxblk_len_set =
+			UHS2_DEV_CONFIG_LT_SET_MAX_BLK_LEN;
+	else
+		host->uhs2_dev_prop.maxblk_len_set =
+			min(host->uhs2_dev_prop.maxblk_len,
+			    host->uhs2_caps.maxblk_len);
+	host->uhs2_caps.maxblk_len_set = host->uhs2_dev_prop.maxblk_len_set;
+
+	host->uhs2_dev_prop.n_fcu_set =
+		min(host->uhs2_dev_prop.n_fcu,
+		    host->uhs2_caps.n_fcu);
+	host->uhs2_caps.n_fcu_set = host->uhs2_dev_prop.n_fcu_set;
+
+	host->uhs2_dev_prop.n_data_gap_set =
+		max(nMinDataGap, host->uhs2_dev_prop.n_data_gap);
+
+	host->uhs2_caps.n_data_gap_set = host->uhs2_dev_prop.n_data_gap_set;
+
+	host->uhs2_caps.max_retry_set = 3;
+	host->uhs2_dev_prop.max_retry_set = host->uhs2_caps.max_retry_set;
+
+	payload[0] = (host->uhs2_dev_prop.maxblk_len_set <<
+			UHS2_DEV_CONFIG_MAX_BLK_LEN_POS) |
+			(host->uhs2_dev_prop.max_retry_set <<
+			UHS2_DEV_CONFIG_LT_SET_MAX_RETRY_POS) |
+			(host->uhs2_dev_prop.n_fcu_set <<
+			UHS2_DEV_CONFIG_N_FCU_POS);
+	payload[1] = host->uhs2_dev_prop.n_data_gap_set;
+	payload[0] = cpu_to_be32(payload[0]);
+	payload[1] = cpu_to_be32(payload[1]);
+
+	pr_debug("Begin SET_COMMON_CFG header=0x%x arg=0x%x\n", header, arg);
+	pr_debug("\t\tpayload[0]=0x%x payload[1]=0x%x\n",
+		 payload[0], payload[1]);
+
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, payload, plen, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	pr_debug("SET_COMMON_CFG: Set Config Completion.\n");
+	arg = ((UHS2_DEV_CONFIG_GEN_SET & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_GEN_SET >> 8);
+
+	plen = 2;
+	payload[0] = 0;
+	payload[1] = UHS2_DEV_CONFIG_GEN_SET_CFG_COMPLETE;
+	payload[0] = cpu_to_be32(payload[0]);
+	payload[1] = cpu_to_be32(payload[1]);
+
+	pr_debug("Begin SET_COMMON_CFG, ");
+	pr_debug("header=0x%x, arg=0x%x, payload[0] = 0x%x.\n",
+		 header, arg, payload[0]);
+	resp_len = 5;
+	memset(resp, 0, sizeof(resp));
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, payload, plen,
+			  resp, resp_len);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	/* Set host Config Setting registers */
+	if (!host->ops->uhs2_set_reg ||
+	    host->ops->uhs2_set_reg(host, SET_CONFIG)) {
+		pr_err("%s: %s: UHS2 SET_CONFIG fail!\n",
+		       mmc_hostname(host), __func__);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int uhs2_go_dormant(struct mmc_host *host, bool hibernate)
 {
+	struct mmc_command cmd = {0};
+	struct uhs2_command uhs2_cmd = {};
+	u16 header = 0, arg = 0;
+	u32 payload[1];
+	u8 plen = 1;
+	int err;
+
+	/* Disable Normal INT */
+	if (!host->ops->uhs2_set_reg ||
+	    host->ops->uhs2_set_reg(host, DISABLE_INT)) {
+		pr_err("%s: %s: UHS2 DISABLE_INT fail!\n",
+		       mmc_hostname(host), __func__);
+		return -EIO;
+	}
+
+	header = UHS2_NATIVE_PACKET | UHS2_PACKET_TYPE_CCMD |
+		host->uhs2_dev_prop.node_id;
+
+	arg = ((UHS2_DEV_CMD_GO_DORMANT_STATE & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_WRITE |
+		UHS2_NATIVE_CMD_PLEN_4B |
+		(UHS2_DEV_CMD_GO_DORMANT_STATE >> 8);
+
+	if (hibernate)
+		payload[0] = UHS2_DEV_CMD_DORMANT_HIBER;
+
+	pr_debug("Begin GO_DORMANT_STATE, ");
+	pr_debug("header=0x%x, arg=0x%x, payload=0x%x.\n",
+		 header, arg, payload[0]);
+	uhs2_cmd_assemble(&cmd, &uhs2_cmd, header, arg, payload, plen, NULL, 0);
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err) {
+		pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	/* Check Dormant State in Present */
+	if (!host->ops->uhs2_set_reg ||
+	    host->ops->uhs2_set_reg(host, CHECK_DORMANT)) {
+		pr_err("%s: %s: UHS2 GO_DORMANT_STATE fail!\n",
+		       mmc_hostname(host), __func__);
+		return -EIO;
+	}
+
+	if (host->ops->uhs2_disable_clk)
+		host->ops->uhs2_disable_clk(host);
+
+	return 0;
+}
+
+static int uhs2_change_speed(struct mmc_host *host)
+{
+	int err;
+	int timeout = 100;
+
+	/* Change Speed Range at controller side. */
+	if (!host->ops->uhs2_set_reg ||
+	    host->ops->uhs2_set_reg(host, SET_SPEED_B)) {
+		pr_err("%s: %s: UHS2 SET_SPEED fail!\n",
+		       mmc_hostname(host), __func__);
+		return -EIO;
+	}
+
+	err = uhs2_go_dormant(host, false);
+	if (err) {
+		pr_err("%s: %s: UHS2 GO_DORMANT_STATE fail, err= 0x%x!\n",
+		       mmc_hostname(host), __func__, err);
+		return -EIO;
+	}
+
+	/* restore sd clock */
+	mmc_delay(5);
+	if (host->ops->uhs2_enable_clk)
+		host->ops->uhs2_enable_clk(host);
+
+	/* Enable Normal INT */
+	if (!host->ops->uhs2_set_reg ||
+	    host->ops->uhs2_set_reg(host, ENABLE_INT)) {
+		pr_err("%s: %s: UHS2 ENABLE_INT fail!\n",
+		       mmc_hostname(host), __func__);
+		return -EIO;
+	}
+
+	/*
+	 * According to UHS-II Addendum Version 1.01, chapter 6.2.3,
+	 * wait card switch to Active State
+	 */
+	header = UHS2_NATIVE_PACKET |
+		 UHS2_PACKET_TYPE_CCMD | host->uhs2_dev_prop.node_id;
+	arg = ((UHS2_DEV_CONFIG_GEN_SET & 0xFF) << 8) |
+		UHS2_NATIVE_CMD_READ |
+		UHS2_NATIVE_CMD_PLEN_8B |
+		(UHS2_DEV_CONFIG_GEN_SET >> 8);
+	do {
+		uhs2_cmd_assemble(&cmd, &uhs2_cmd,
+				  header, arg,
+				  NULL, 0,
+				  NULL, 0);
+		err = mmc_wait_for_cmd(host, &cmd, 0);
+		if (err) {
+			pr_err("%s: %s: UHS2 CMD send fail, err= 0x%x!\n",
+			       mmc_hostname(host), __func__, err);
+			return -EIO;
+		}
+
+		pr_debug("%s: Device Generic Settings Register=0x%x-0x%x\n",
+			 mmc_hostname(host), cmd.resp[0], cmd.resp[1])
+		if (cmd.resp[1] & UHS2_DEV_CONFIG_GEN_SET_CFG_COMPLETE) {
+			pr_debug("%s: %s: UHS2 switch to range B OK\n",
+				 mmc_hostname(host), __func__);
+			break;
+		}
+
+		timeout--;
+		if (timeout == 0) {
+			pr_err("%s: %s: UHS2 not switch to Active in 100ms.\n",
+			       mmc_hostname(host->mmc), __func__);
+			return -EIO;
+		}
+
+		mmc_delay(1);
+
+	} while (1);
+
 	return 0;
 }
 
@@ -108,8 +822,67 @@ static int sd_uhs2_config_write(struct mmc_host *host, struct mmc_card *card)
  * be set through a legacy CMD6. Note that, the power limit that becomes set,
  * survives a soft reset through the GO_DORMANT_STATE command.
  */
-static int sd_uhs2_legacy_init(struct mmc_host *host, struct mmc_card *card)
+static int sd_uhs2_legacy_init(struct mmc_host *host)
 {
+	int err;
+	u32 ocr, rocr;
+
+	WARN_ON(!host->claimed);
+
+	/* Send CMD0 to reset SD card */
+	mmc_go_idle(host);
+
+	/* Send CMD8 to communicate SD interface operation condition */
+	err = mmc_send_if_cond(host, host->ocr_avail);
+	if (err) {
+		pr_err("%s: %s: SEND_IF_COND fail!\n",
+		       mmc_hostname(host), __func__);
+		return err;
+	}
+
+	/*
+	 * Get CID, send relative address, get CSD are the same as legacy
+	 * sd, call mmc_sd_init_card() in sd.c directly
+	 */
+	err = mmc_send_app_op_cond(host, 0, &ocr);
+	if (err) {
+		pr_err("%s: %s: SD_SEND_OP_COND fail!\n",
+		       mmc_hostname(host), __func__);
+		return err;
+	}
+
+	if (host->ocr_avail_sd)
+		host->ocr_avail = host->ocr_avail_sd;
+
+	/*
+	 * Some SD cards claims an out of spec VDD voltage range. Let's treat
+	 * these bits as being in-valid and especially also bit7.
+	 */
+	ocr &= ~0x7FFF;
+	rocr = mmc_select_voltage(host, ocr);
+
+	/*
+	 * Some cards have zero value of rocr in UHS-II mode. Assign host's ocr
+	 * value to rocr.
+	 */
+	if (!rocr) {
+		if (host->ocr_avail) {
+			rocr = host->ocr_avail;
+		} else {
+			pr_err("%s: %s: there is no valid OCR.\n",
+			       mmc_hostname(host), __func__);
+			return -EINVAL;
+		}
+	}
+
+	/*
+	 * Get CID, send relative address, get CSD are the same as legacy
+	 * sd, call mmc_sd_init_card() in sd.c directly
+	 */
+	err = mmc_sd_init_card(host, rocr, NULL);
+	if (err) {
+		pr_err("%s: %s: mmc_sd_init_card() fail!\n",
+		       mmc_hostname(host), __func__);
+		return err;
+	}
+
 	return 0;
 }
 
@@ -120,42 +893,49 @@ static int sd_uhs2_legacy_init(struct mmc_host *host, struct mmc_card *card)
 static int sd_uhs2_init_card(struct mmc_host *host)
 {
 	struct mmc_card *card;
-	u32 node_id;
 	int err;
 
 	err = sd_uhs2_dev_init(host);
-	if (err)
+	if (err) {
+		pr_err("%s: UHS2 DEVICE_INIT fail!\n", mmc_hostname(host));
 		return err;
+	}
 
-	err = sd_uhs2_enum(host, &node_id);
+	err = sd_uhs2_enum(host);
+	if (err) {
+		pr_err("%s: UHS2 ENUMERATE fail!\n", mmc_hostname(host));
+		return err;
+	}
+
+	err = sd_uhs2_config_read(host);
 	if (err)
 		return err;
 
-	card = mmc_alloc_card(host, &sd_type);
-	if (IS_ERR(card))
-		return PTR_ERR(card);
+	err = sd_uhs2_config_write(host);
+	if (err)
+		return err;
 
-	card->uhs2_config.node_id = node_id;
-	card->type = MMC_TYPE_SD;
+	/* Delay some time to let card apply new configuration */
+	mmc_delay(10);
 
-	err = sd_uhs2_config_read(host, card);
-	if (err)
-		goto err;
+	/* Change to Speed Range B if it is supported */
+	if (host->flags & MMC_UHS2_SPEED_B) {
+		err = uhs2_change_speed(host);
+		if (err) {
+			pr_err("%s: %s: UHS2 uhs2_change_speed() fail!\n",
+			       mmc_hostname(host), __func__);
+			return err;
+		}
+	}
 
-	err = sd_uhs2_config_write(host, card);
-	if (err)
-		goto err;
+	host->flags |= MMC_UHS2_INITIALIZED;
 
-	err = sd_uhs2_legacy_init(host, card);
+	err = sd_uhs2_legacy_init(host);
 	if (err)
-		goto err;
+		return err;
 
 	host->card = card;
 	return 0;
-
-err:
-	mmc_remove_card(card);
-	return err;
 }
 
 static void sd_uhs2_remove(struct mmc_host *host)
@@ -234,38 +1014,66 @@ static int sd_uhs2_attach(struct mmc_host *host)
 	int err;
 
 	err = sd_uhs2_power_up(host);
-	if (err)
+	if (err) {
+		pr_debug("%s: %s: sd_uhs2_power_up() fail!\n",
+			 mmc_hostname(host), __func__);
 		goto err;
+	}
 
 	err = sd_uhs2_phy_init(host);
-	if (err)
+	if (err) {
+		pr_debug("%s: %s: sd_uhs2_phy_init() fail!\n",
+			 mmc_hostname(host), __func__);
 		goto err;
+	}
 
 	err = sd_uhs2_init_card(host);
-	if (err)
+	if (err) {
+		pr_debug("%s: %s: sd_uhs2_init_card() fail!\n",
+			 mmc_hostname(host), __func__);
 		goto err;
+	}
 
 	mmc_attach_bus(host, &sd_uhs2_ops);
 
 	mmc_release_host(host);
 
 	err = mmc_add_card(host->card);
-	if (err)
+	if (err) {
+		pr_debug("%s: %s: mmc_add_card() fail!\n",
+			 mmc_hostname(host), __func__);
 		goto remove_card;
+	}
 
 	mmc_claim_host(host);
+
+	if (host->ops->uhs2_post_attach_sd)
+		host->ops->uhs2_post_attach_sd(host);
+
 	return 0;
 
 remove_card:
-	mmc_remove_card(host->card);
-	host->card = NULL;
+	sd_uhs2_remove(host);
 	mmc_claim_host(host);
-	mmc_detach_bus(host);
+
 err:
+	mmc_detach_bus(host);
 	sd_uhs2_power_off(host);
+	if (host->flags & MMC_UHS2_INITIALIZED)
+		host->flags &= ~MMC_UHS2_INITIALIZED;
+	host->flags &= ~MMC_UHS2_SUPPORT;
 	return err;
 }
 
+/**
+ * mmc_attach_sd_uhs2 - select UHS2 interface
+ * @host: MMC host
+ *
+ * Try to select UHS2 interface and initialize the bus for a given
+ * frequency, @freq.
+ *
+ * Return:	0 on success, non-zero error on failure
+ */
 int mmc_attach_sd_uhs2(struct mmc_host *host)
 {
 	int i, err = 0;
@@ -273,8 +1081,12 @@ int mmc_attach_sd_uhs2(struct mmc_host *host)
 	if (!(host->caps2 & MMC_CAP2_SD_UHS2))
 		return -EOPNOTSUPP;
 
-	/* Turn off the legacy SD interface before trying with UHS-II. */
-	mmc_power_off(host);
+	host->flags |= MMC_UHS2_SUPPORT;
+
+	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
+		pr_info("mmc_card_sd_uhs2: sdio\n");
+	if (!(host->caps2 & MMC_CAP2_NO_SD))
+		pr_info("mmc_card_sd_uhs2: sd\n");
 
 	/*
 	 * Start UHS-II initialization at 52MHz and possibly make a retry at
@@ -282,11 +1094,17 @@ int mmc_attach_sd_uhs2(struct mmc_host *host)
 	 * validates ios->clock, to set a rate within the correct range.
 	 */
 	for (i = 0; i < ARRAY_SIZE(sd_uhs2_freqs); i++) {
-		host->f_init = sd_uhs2_freqs[i];
-		err = sd_uhs2_attach(host);
-		if (!err)
-			break;
-	}
+		host->f_init = sd_uhs2_freqs[i];
+		pr_debug("%s: %s: trying to init card at %u Hz\n",
+			 mmc_hostname(host), __func__, host->f_init);
 
-	return err;
+		err = sd_uhs2_attach(host);
+		if (!err)
+			break;
+		else
+			pr_debug("%s: %s: init card at %u Hz failed\n",
+				 mmc_hostname(host), __func__,
+				 host->f_init);
+	}
+
+	return err;
 }
-- 
2.32.0


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