linux-kernel - [PATCH v2 1/2] scsi: ufs: ufs-qcom: Clear qunipro_g4

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Message-Id: <20230119151406.4168685-2-abel.vesa@linaro.org>
Date:   Thu, 19 Jan 2023 17:14:05 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Manivannan Sadhasivam <mani@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/2] scsi: ufs: ufs-qcom: Clear qunipro_g4_sel for HW version major 5

On SM8550, depending on the Qunipro, we can run with G5 or G4.
For now, when the major version is 5 or above, we go with G5.
Therefore, we need to specifically tell UFS HC that.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 drivers/ufs/host/ufs-qcom.c | 8 ++++++--
 drivers/ufs/host/ufs-qcom.h | 6 +++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 5e7ba3b6a59d..7b6deef4e49a 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -218,6 +218,10 @@ static void ufs_qcom_select_unipro_mode(struct ufs_qcom_host *host)
 	ufshcd_rmwl(host->hba, QUNIPRO_SEL,
 		   ufs_qcom_cap_qunipro(host) ? QUNIPRO_SEL : 0,
 		   REG_UFS_CFG1);
+
+	if (host->hw_ver.major == 0x05)
+		ufshcd_rmwl(host->hba, QUNIPRO_G4_SEL, 0, REG_UFS_CFG0);
+
 	/* make sure above configuration is applied before we return */
 	mb();
 }
@@ -507,9 +511,9 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
 		mb();
 	}
 
-	if (update_link_startup_timer) {
+	if (update_link_startup_timer && host->hw_ver.major != 0x5) {
 		ufshcd_writel(hba, ((core_clk_rate / MSEC_PER_SEC) * 100),
-			      REG_UFS_PA_LINK_STARTUP_TIMER);
+			      REG_UFS_CFG0);
 		/*
 		 * make sure that this configuration is applied before
 		 * we return
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index f744a9e62002..cca773210bcb 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -35,7 +35,8 @@ enum {
 	REG_UFS_PA_ERR_CODE                 = 0xCC,
 	/* On older UFS revisions, this register is called "RETRY_TIMER_REG" */
 	REG_UFS_PARAM0                      = 0xD0,
-	REG_UFS_PA_LINK_STARTUP_TIMER       = 0xD8,
+	/* On older UFS revisions, this register is called "REG_UFS_PA_LINK_STARTUP_TIMER" */
+	REG_UFS_CFG0                        = 0xD8,
 	REG_UFS_CFG1                        = 0xDC,
 	REG_UFS_CFG2                        = 0xE0,
 	REG_UFS_HW_VERSION                  = 0xE4,
@@ -73,6 +74,9 @@ enum {
 #define UFS_CNTLR_2_x_x_VEN_REGS_OFFSET(x)	(0x000 + x)
 #define UFS_CNTLR_3_x_x_VEN_REGS_OFFSET(x)	(0x400 + x)
 
+/* bit definitions for REG_UFS_CFG0 register */
+#define QUNIPRO_G4_SEL		BIT(5)
+
 /* bit definitions for REG_UFS_CFG1 register */
 #define QUNIPRO_SEL		BIT(0)
 #define UFS_PHY_SOFT_RESET	BIT(1)
-- 
2.34.1