linux-kernel - [PATCH v1 02/16] ufs: core: Introduce Multi-circular queue capability

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Message-ID: <fa3d70c1642c64ce75461f630eabe84b3b974d4e.1663894792.git.quic_asutoshd@quicinc.com>
Date:   Thu, 22 Sep 2022 18:05:09 -0700
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     <mani@...nel.org>, <quic_nguyenb@...cinc.com>,
        <quic_xiaosenh@...cinc.com>, <quic_cang@...cinc.com>,
        <quic_nitirawa@...cinc.com>, <quic_rampraka@...cinc.com>,
        <quic_richardp@...cinc.com>, <stanley.chu@...iatek.com>,
        <adrian.hunter@...el.com>, <bvanassche@....org>,
        <avri.altman@....com>, <beanhuo@...ron.com>,
        <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v1 02/16] ufs: core: Introduce Multi-circular queue capability

Adds support to check for MCQ capability in the UFSHC.
This capability can be used by host drivers to control
MCQ enablement.

Co-developed-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
---
 drivers/ufs/core/ufshcd.c |  5 +++++
 include/ufs/ufshcd.h      | 13 +++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 4b9ae83..24661fc 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -89,6 +89,7 @@
 #define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
 
 #define EXT_IID_CAP_SHIFT 10
+#define MCQ_SUPP_SHIFT 30
 #define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
 	({                                                              \
 		int _ret;                                               \
@@ -2240,6 +2241,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
 	if (err)
 		dev_err(hba->dev, "crypto setup failed\n");
 
+	hba->mcq_sup = (hba->capabilities & MASK_MCQ_SUPPORT) >> MCQ_SUPP_SHIFT;
+	if (!hba->mcq_sup)
+		return err;
+
 	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
 	hba->ext_iid_sup = (hba->mcq_capabilities & MASK_EXT_IID_SUPPORT) >>
 		EXT_IID_CAP_SHIFT;
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index da1eb8a..da7ec0c 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -660,6 +660,12 @@ enum ufshcd_caps {
 	 * notification if it is supported by the UFS device.
 	 */
 	UFSHCD_CAP_TEMP_NOTIF				= 1 << 11,
+
+	/*
+	 * This capability allows the host controller driver to turn on/off
+	 * MCQ mode. MCQ mode may be used to increase performance.
+	 */
+	UFSHCD_CAP_MCQ_EN				= 1 << 12,
 };
 
 struct ufs_hba_variant_params {
@@ -820,6 +826,7 @@ struct ufs_hba_monitor {
  * @complete_put: whether or not to call ufshcd_rpm_put() from inside
  *	ufshcd_resume_complete()
  * @ext_iid_sup: is EXT_IID is supported by UFSHC
+ * @mcq_sup: is mcq supported by UFSHC
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -969,8 +976,14 @@ struct ufs_hba {
 	u32 luns_avail;
 	bool complete_put;
 	bool ext_iid_sup;
+	bool mcq_sup;
 };
 
+static inline bool is_mcq_supported(struct ufs_hba *hba)
+{
+	return hba->mcq_sup && (hba->caps & UFSHCD_CAP_MCQ_EN);
+}
+
 /* Returns true if clocks can be gated. Otherwise false */
 static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
 {
-- 
2.7.4