Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1265357

[PATCH v5 06/11] scsi: ufs: add quirk to enable host controller without hce

Show all headers | View raw

From: Seungwon Jeon <essuuj@gmail.com>

Some host controller doesn't support host controller enable via HCE.

Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/scsi/ufs/ufshcd.c |   75 +++++++++++++++++++++++++++++++++++++++++++--
 drivers/scsi/ufs/ufshcd.h |    5 +++
 2 files changed, 78 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ca7483cd899e..e8b96ec65987 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2107,6 +2107,52 @@ static int ufshcd_dme_link_startup(struct ufs_hba *hba)
 			"dme-link-startup: error code %d\n", ret);
 	return ret;
 }
+/**
+ * ufshcd_dme_reset - UIC command for DME_RESET
+ * @hba: per adapter instance
+ *
+ * DME_RESET command is issued in order to reset UniPro stack.
+ * This function now deal with cold reset.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_dme_reset(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	uic_cmd.command = UIC_CMD_DME_RESET;
+
+	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+	if (ret)
+		dev_err(hba->dev,
+			"dme-reset: error code %d\n", ret);
+
+	return ret;
+}
+
+/**
+ * ufshcd_dme_enable - UIC command for DME_ENABLE
+ * @hba: per adapter instance
+ *
+ * DME_ENABLE command is issued in order to enable UniPro stack.
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_dme_enable(struct ufs_hba *hba)
+{
+	struct uic_command uic_cmd = {0};
+	int ret;
+
+	uic_cmd.command = UIC_CMD_DME_ENABLE;
+
+	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+	if (ret)
+		dev_err(hba->dev,
+			"dme-reset: error code %d\n", ret);
+
+	return ret;
+}
 
 static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
 {
@@ -2642,7 +2688,7 @@ out:
 }
 
 /**
- * ufshcd_hba_enable - initialize the controller
+ * ufshcd_hba_execute_hce - initialize the controller
  * @hba: per adapter instance
  *
  * The controller resets itself and controller firmware initialization
@@ -2651,7 +2697,7 @@ out:
  *
  * Returns 0 on success, non-zero value on failure
  */
-static int ufshcd_hba_enable(struct ufs_hba *hba)
+static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
 {
 	int retry;
 
@@ -2715,6 +2761,31 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
 	return 0;
 }
 
+static int ufshcd_hba_enable(struct ufs_hba *hba)
+{
+	int ret;
+
+	if (hba->quirks & UFSHCI_QUIRK_BROKEN_HCE) {
+		ufshcd_set_link_off(hba);
+		ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);
+
+		/* enable UIC related interrupts */
+		ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
+		ret = ufshcd_dme_reset(hba);
+		if (!ret) {
+			ret = ufshcd_dme_enable(hba);
+			if (!ret)
+				ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
+			if (ret)
+				dev_err(hba->dev,
+					"Host controller enable failed with non-hce\n");
+		}
+	} else {
+		ret = ufshcd_hba_execute_hce(hba);
+	}
+
+	return ret;
+}
 static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
 {
 	int tx_lanes, i, err = 0;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 4ae32e9316de..500e137bf68a 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -485,6 +485,11 @@ struct ufs_hba {
 	 */
 	#define UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR		UFS_BIT(8)
 
+	/*
+	 * This quirks needs to be enabled if host controller cannot be
+	 * enabled via HCE register.
+	 */
+	#define UFSHCI_QUIRK_BROKEN_HCE				UFS_BIT(9)
 	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */
 
 	wait_queue_head_t tm_wq;
-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v5 00/11] exynos-ufs: add support for Exynos Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 06/11] scsi: ufs: add quirk to enable host controller  without hce Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 01/11] Documentation: samsung-phy: Add dt bindings for UFS Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 02/11] phy: exynos-ufs: add UFS PHY driver for EXYNOS SoC Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 04/11] scsi: ufs: add quirk to fix mishandling  utrlclr/utmrlclr Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 03/11] scsi: ufs: add quirk to contain unconformable utrd  field Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:30 +0100
  [PATCH v5 08/11] scsi: ufs: add add specific callback for hibern8 Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:40 +0100
  [PATCH v5 09/11] scsi: ufs: make ufshcd_config_pwr_mode of non-static  func Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:40 +0100
  [PATCH v5 10/11] Documentation: devicetree: ufs: Add DT bindings for  exynos UFS host controller Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:40 +0100
    Re: [PATCH v5 10/11] Documentation: devicetree: ufs: Add DT bindings  for exynos UFS host controller Rob Herring <robh@kernel.org> - 2015-11-09 17:30 +0100
      Re: [PATCH v5 10/11] Documentation: devicetree: ufs: Add DT bindings  for exynos UFS host controller Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-10 09:40 +0100
  [PATCH v5 07/11] scsi: ufs: add specific callback for nexus type Alim Akhtar <alim.akhtar@samsung.com> - 2015-11-09 06:40 +0100
  Re: [PATCH v5 00/11] exynos-ufs: add support for Exynos Alim Akhtar <alim.akhtar@gmail.com> - 2015-11-16 02:10 +0100

csiph-web