linux-kernel - [PATCH v2 8/9] scsi: ufs: Initialize max_lu

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Date:   Thu, 16 Jan 2020 22:59:13 +0100
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 8/9] scsi: ufs: Initialize max_lu_supported

From: Bean Huo <beanhuo@...ron.com>

This patch is to initialize max_lu_supported, it also adds a new
function ufshcd_init_device_geo_params() for initialization of UFS
device geometry descriptor related parameters which are used by
driver. In this version patch, there is only dev_info.max_lu_supported
being initialized.

Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufshcd.c | 41 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 31b6e2a7c166..0c4fb5d447da 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6858,6 +6858,37 @@ static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
 		hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
 }
 
+static int ufshcd_init_device_geo_params(struct ufs_hba *hba)
+{
+	int err;
+	size_t buff_len;
+	u8 *desc_buf;
+
+	buff_len = hba->desc_size.geom_desc;
+	desc_buf = kmalloc(buff_len, GFP_KERNEL);
+	if (!desc_buf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = ufshcd_read_desc(hba, QUERY_DESC_IDN_GEOMETRY, 0,
+			desc_buf, buff_len);
+	if (err) {
+		dev_err(hba->dev, "%s: Failed reading Geometry Desc. err = %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 1)
+		hba->dev_info.max_lu_supported = 32;
+	else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
+		hba->dev_info.max_lu_supported = 8;
+
+out:
+	kfree(desc_buf);
+	return err;
+}
+
 static struct ufs_ref_clk ufs_ref_clk_freqs[] = {
 	{19200000, REF_CLK_FREQ_19_2_MHZ},
 	{26000000, REF_CLK_FREQ_26_MHZ},
@@ -6931,9 +6962,17 @@ static int ufs_init_params(struct ufs_hba *hba)
 	bool flag;
 	int ret;
 
+	/* Clear any previous UFS device information */
+	memset(&hba->dev_info, 0, sizeof(hba->dev_info));
+
 	/* Init check for device descriptor sizes */
 	ufshcd_init_desc_sizes(hba);
 
+	/* Init UFS geometry descriptor related parameters */
+	ret = ufshcd_init_device_geo_params(hba);
+	if (ret)
+		goto out;
+
 	/* Check and apply UFS device quirks */
 	ret = ufs_get_device_desc(hba);
 	if (ret) {
@@ -6944,8 +6983,6 @@ static int ufs_init_params(struct ufs_hba *hba)
 
 	ufs_fixup_device_setup(hba);
 
-	/* Clear any previous UFS device information */
-	memset(&hba->dev_info, 0, sizeof(hba->dev_info));
 	if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
 			QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
 		hba->dev_info.f_power_on_wp_en = flag;
-- 
2.17.1