linux-kernel - [RFC 12/12] arm_mpam: Program Downstream priority value

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Message-ID: <20230815152712.1760046-13-amitsinght@marvell.com>
Date:   Tue, 15 Aug 2023 20:57:12 +0530
From:   Amit Singh Tomar <amitsinght@...vell.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
        <james.morse@....com>, <gcherian@...vell.com>, <robh@...nel.org>,
        <peternewman@...gle.com>, Amit Singh Tomar <amitsinght@...vell.com>
Subject: [RFC 12/12] arm_mpam: Program Downstream priority value

Now that Downstream priorities values can be passed from resource control
schemata file, let's program it into memory mapped Priority Partition
Configuration Register.

Signed-off-by: Amit Singh Tomar <amitsinght@...vell.com>
---
TODO:
	* Invert Priority value based on DSPRI_0_IS_LOW, suggested
          by James. 
---
 drivers/platform/mpam/mpam_devices.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 59022e42920c..8af6424bb27b 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1153,8 +1153,12 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
 
 		if (mpam_has_feature(mpam_feat_intpri_part, rprops))
 			pri_val |= FIELD_PREP(MPAMCFG_PRI_INTPRI, intpri);
-		if (mpam_has_feature(mpam_feat_dspri_part, rprops))
-			pri_val |= FIELD_PREP(MPAMCFG_PRI_DSPRI, dspri);
+		if (mpam_has_feature(mpam_feat_dspri_part, rprops)) {
+			if (mpam_has_feature(mpam_feat_dspri_part, cfg)) {
+				pri_val |= FIELD_PREP(MPAMCFG_PRI_DSPRI, cfg->dspri & dspri);
+			} else
+				pri_val |= FIELD_PREP(MPAMCFG_PRI_DSPRI, dspri);
+		}
 
 		mpam_write_partsel_reg(msc, PRI, pri_val);
 	}
-- 
2.25.1