[PATCH v1 17/17] scsi: ufs-qcom: set PA_Local_TX_LCC_Enable before link startup

From: Yaniv Gardi
Date: Sun Sep 13 2015 - 10:55:07 EST

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Some UFS devices (and may be host) have issues if LCC is
enabled. So we are setting PA_Local_TX_LCC_Enable to 0
before link startup which will make sure that both host
and device TX LCC are disabled once link startup is
completed.

This change also:
- enables the device ref clock before changing to HS mode
and disables it if entered to PWM mode
- adds printouts of testbus debug registers

Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>

---
drivers/scsi/ufs/ufs-qcom.c | 116 +++++++++++++++++++++++++++++++++++++++++---
drivers/scsi/ufs/ufs-qcom.h | 9 ++++
drivers/scsi/ufs/ufshcd.h | 9 ++++
drivers/scsi/ufs/unipro.h | 1 +
4 files changed, 128 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 1d26e49..f70b581 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -16,8 +16,8 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
-
#include <linux/phy/phy-qcom-ufs.h>
+
#include "ufshcd.h"
#include "ufshcd-pltfrm.h"
#include "unipro.h"
@@ -58,6 +58,12 @@ static void ufs_qcom_dump_regs(struct ufs_hba *hba, int offset, int len,
len * 4, false);
}

+static void ufs_qcom_dump_regs_wrapper(struct ufs_hba *hba, int offset, int len,
+ char *prefix, void *priv)
+{
+ ufs_qcom_dump_regs(hba, offset, len, prefix);
+}
+
static int ufs_qcom_get_connected_tx_lanes(struct ufs_hba *hba, u32 *tx_lanes)
{
int err = 0;
@@ -106,9 +112,11 @@ static void ufs_qcom_disable_lane_clks(struct ufs_qcom_host *host)
if (!host->is_lane_clks_enabled)
return;

- clk_disable_unprepare(host->tx_l1_sync_clk);
+ if (host->hba->lanes_per_direction > 1)
+ clk_disable_unprepare(host->tx_l1_sync_clk);
clk_disable_unprepare(host->tx_l0_sync_clk);
- clk_disable_unprepare(host->rx_l1_sync_clk);
+ if (host->hba->lanes_per_direction > 1)
+ clk_disable_unprepare(host->rx_l1_sync_clk);
clk_disable_unprepare(host->rx_l0_sync_clk);

host->is_lane_clks_enabled = false;
@@ -271,9 +279,8 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
ret = ufs_qcom_phy_calibrate_phy(phy, is_rate_B);

if (ret) {
- dev_err(hba->dev,
- "%s: ufs_qcom_phy_calibrate_phy()failed, ret = %d\n",
- __func__, ret);
+ dev_err(hba->dev, "%s: ufs_qcom_phy_calibrate_phy() failed, ret = %d\n",
+ __func__, ret);
goto out;
}

@@ -523,6 +530,18 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
err = ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(hba,
150);

+ /*
+ * Some UFS devices (and may be host) have issues if LCC is
+ * enabled. So we are setting PA_Local_TX_LCC_Enable to 0
+ * before link startup which will make sure that both host
+ * and device TX LCC are disabled once link startup is
+ * completed.
+ */
+ if (ufshcd_get_local_unipro_ver(hba) != UFS_UNIPRO_VER_1_41)
+ err = ufshcd_dme_set(hba,
+ UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
+ 0);
+
break;
case POST_CHANGE:
ufs_qcom_link_startup_post_change(hba);
@@ -966,6 +985,10 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
goto out;
}

+ /* enable the device ref clock before changing to HS mode */
+ if (!ufshcd_is_hs_mode(&hba->pwr_info) &&
+ ufshcd_is_hs_mode(dev_req_params))
+ ufs_qcom_dev_ref_clk_ctrl(host, true);
break;
case POST_CHANGE:
if (ufs_qcom_cfg_timers(hba, dev_req_params->gear_rx,
@@ -993,6 +1016,11 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
memcpy(&host->dev_req_params,
dev_req_params, sizeof(*dev_req_params));
ufs_qcom_update_bus_bw_vote(host);
+
+ /* disable the device ref clock if entered PWM mode */
+ if (ufshcd_is_hs_mode(&hba->pwr_info) &&
+ !ufshcd_is_hs_mode(dev_req_params))
+ ufs_qcom_dev_ref_clk_ctrl(host, false);
break;
default:
ret = -EINVAL;
@@ -1094,6 +1122,9 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on)
ufs_qcom_phy_disable_iface_clk(host->generic_phy);
goto out;
}
+ /* enable the device ref clock for HS mode*/
+ if (ufshcd_is_hs_mode(&hba->pwr_info))
+ ufs_qcom_dev_ref_clk_ctrl(host, true);
vote = host->bus_vote.saved_vote;
if (vote == host->bus_vote.min_bw_vote)
ufs_qcom_update_bus_bw_vote(host);
@@ -1372,6 +1403,74 @@ out:
return err;
}

+static void ufs_qcom_print_hw_debug_reg_all(struct ufs_hba *hba,
+ void *priv, void (*print_fn)(struct ufs_hba *hba,
+ int offset, int num_regs, char *str, void *priv))
+{
+ u32 reg;
+ struct ufs_qcom_host *host;
+
+ if (unlikely(!hba)) {
+ pr_err("%s: hba is NULL\n", __func__);
+ return;
+ }
+ if (unlikely(!print_fn)) {
+ dev_err(hba->dev, "%s: print_fn is NULL\n", __func__);
+ return;
+ }
+
+ host = ufshcd_get_variant(hba);
+ if (!(host->dbg_print_en & UFS_QCOM_DBG_PRINT_REGS_EN))
+ return;
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_UFS_DBG_RD_REG_OCSC);
+ print_fn(hba, reg, 44, "UFS_UFS_DBG_RD_REG_OCSC ", priv);
+
+ reg = ufshcd_readl(hba, REG_UFS_CFG1);
+ reg |= UFS_BIT(17);
+ ufshcd_writel(hba, reg, REG_UFS_CFG1);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_UFS_DBG_RD_EDTL_RAM);
+ print_fn(hba, reg, 32, "UFS_UFS_DBG_RD_EDTL_RAM ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_UFS_DBG_RD_DESC_RAM);
+ print_fn(hba, reg, 128, "UFS_UFS_DBG_RD_DESC_RAM ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_UFS_DBG_RD_PRDT_RAM);
+ print_fn(hba, reg, 64, "UFS_UFS_DBG_RD_PRDT_RAM ", priv);
+
+ ufshcd_writel(hba, (reg & ~UFS_BIT(17)), REG_UFS_CFG1);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_UAWM);
+ print_fn(hba, reg, 4, "UFS_DBG_RD_REG_UAWM ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_UARM);
+ print_fn(hba, reg, 4, "UFS_DBG_RD_REG_UARM ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_TXUC);
+ print_fn(hba, reg, 48, "UFS_DBG_RD_REG_TXUC ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_RXUC);
+ print_fn(hba, reg, 27, "UFS_DBG_RD_REG_RXUC ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_DFC);
+ print_fn(hba, reg, 19, "UFS_DBG_RD_REG_DFC ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_TRLUT);
+ print_fn(hba, reg, 34, "UFS_DBG_RD_REG_TRLUT ", priv);
+
+ reg = ufs_qcom_get_debug_reg_offset(host, UFS_DBG_RD_REG_TMRLUT);
+ print_fn(hba, reg, 9, "UFS_DBG_RD_REG_TMRLUT ", priv);
+}
+
+static void ufs_qcom_enable_test_bus(struct ufs_qcom_host *host)
+{
+ if (host->dbg_print_en & UFS_QCOM_DBG_PRINT_TEST_BUS_EN)
+ ufshcd_rmwl(host->hba, TEST_BUS_EN, TEST_BUS_EN, REG_UFS_CFG1);
+ else
+ ufshcd_rmwl(host->hba, TEST_BUS_EN, 0, REG_UFS_CFG1);
+}
+
static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host)
{
/* provide a legal default configuration */
@@ -1480,6 +1579,7 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
ufshcd_rmwl(host->hba, mask,
(u32)host->testbus.select_minor << offset,
reg);
+ ufs_qcom_enable_test_bus(host);
ufshcd_release(host->hba);
pm_runtime_put_sync(host->hba->dev);

@@ -1496,8 +1596,10 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
ufs_qcom_dump_regs(hba, REG_UFS_SYS1CLK_1US, 16,
"HCI Vendor Specific Registers ");

+ ufs_qcom_print_hw_debug_reg_all(hba, NULL, ufs_qcom_dump_regs_wrapper);
ufs_qcom_testbus_read(hba);
}
+
/**
* struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
*
@@ -1558,7 +1660,7 @@ out:
* ufs_qcom_remove - set driver_data of the device to NULL
* @pdev: pointer to platform device handle
*
- * Always return 0
+ * Always returns 0
*/
static int ufs_qcom_remove(struct platform_device *pdev)
{
diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h
index 36249b3..a19307a 100644
--- a/drivers/scsi/ufs/ufs-qcom.h
+++ b/drivers/scsi/ufs/ufs-qcom.h
@@ -241,6 +241,15 @@ struct ufs_qcom_host {
struct ufs_qcom_testbus testbus;
};

+static inline u32
+ufs_qcom_get_debug_reg_offset(struct ufs_qcom_host *host, u32 reg)
+{
+ if (host->hw_ver.major <= 0x02)
+ return UFS_CNTLR_2_x_x_VEN_REGS_OFFSET(reg);
+
+ return UFS_CNTLR_3_x_x_VEN_REGS_OFFSET(reg);
+};
+
#define ufs_qcom_is_link_off(hba) ufshcd_is_link_off(hba)
#define ufs_qcom_is_link_active(hba) ufshcd_is_link_active(hba)
#define ufs_qcom_is_link_hibern8(hba) ufshcd_is_link_hibern8(hba)
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index aa1f3e5..cba580c 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -54,6 +54,7 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
+#include "unipro.h"

#include <asm/irq.h>
#include <asm/byteorder.h>
@@ -689,6 +690,14 @@ static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,

int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size);

+static inline bool ufshcd_is_hs_mode(struct ufs_pa_layer_attr *pwr_info)
+{
+ return (pwr_info->pwr_rx == FAST_MODE ||
+ pwr_info->pwr_rx == FASTAUTO_MODE) &&
+ (pwr_info->pwr_tx == FAST_MODE ||
+ pwr_info->pwr_tx == FASTAUTO_MODE);
+}
+
#define ASCII_STD true

int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, u8 *buf,
diff --git a/drivers/scsi/ufs/unipro.h b/drivers/scsi/ufs/unipro.h
index 8082020..e2854e4 100644
--- a/drivers/scsi/ufs/unipro.h
+++ b/drivers/scsi/ufs/unipro.h
@@ -75,6 +75,7 @@
#define PA_MAXRXSPEEDFAST 0x1541
#define PA_MAXRXSPEEDSLOW 0x1542
#define PA_TXLINKSTARTUPHS 0x1544
+#define PA_LOCAL_TX_LCC_ENABLE 0x155E
#define PA_TXSPEEDFAST 0x1565
#define PA_TXSPEEDSLOW 0x1566
#define PA_REMOTEVERINFO 0x15A0
--
1.8.5.2

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Next message: Yaniv Gardi: "[PATCH v1 11/17] scsi: ufs: add error recovery after DL NAC error"
Previous message: Yaniv Gardi: "[PATCH v1 16/17] scsi: ufs: add delay before putting UFS rails in low power modes"
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