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From:   Serge Semin <fancer.lancer@gmail.com>
To:     Michal Simek <michal.simek@amd.com>,
        Alexander Stein <alexander.stein@ew.tq-group.com>,
        Borislav Petkov <bp@alien8.de>,
        Tony Luck <tony.luck@intel.com>,
        James Morse <james.morse@arm.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Robert Richter <rric@kernel.org>
Cc:     Serge Semin <fancer.lancer@gmail.com>,
        Punnaiah Choudary Kalluri 
        <punnaiah.choudary.kalluri@xilinx.com>,
        Dinh Nguyen <dinguyen@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v4 08/18] EDAC/synopsys: Parse ADDRMAP[0] CSR for multi-ranks case only
Date:   Wed, 20 Sep 2023 22:26:53 +0300
Message-ID: <20230920192806.29960-9-fancer.lancer@gmail.com>
In-Reply-To: <20230920192806.29960-1-fancer.lancer@gmail.com>
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The ADDRMAP[0] CSR contains the SDRAM Rank bits mapping (and memory
channel mapping but it's irrelevant in this case). Obviously they are
applicable for the multi-ranked memory only. If either the attached memory
isn't multi-ranked or the controller simply doesn't support the multi-rank
memory, parsing the ADDRMAP[0] CSR will be not just pointless, but in the
later case erroneous since the CSR fields will contain zeros which will be
perceived by the mapping detection procedure as a valid value. So the
mapping will get to be invalid. Thus make sure the ADDRMAP[0] register is
parsed only if a multi-ranked memory setup has been detected.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
---
 drivers/edac/synopsys_edac.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index 5a06038aedcb..e6288e135480 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -1146,9 +1146,12 @@ static void snps_setup_bg_address_map(struct snps_edac_priv *priv, u32 *addrmap)
 
 static void snps_setup_rank_address_map(struct snps_edac_priv *priv, u32 *addrmap)
 {
-	priv->rank_shift[0] = ((addrmap[0] & RANK_MAX_VAL_MASK) ==
-				RANK_MAX_VAL_MASK) ? 0 : ((addrmap[0] &
-				RANK_MAX_VAL_MASK) + RANK_B0_BASE);
+	/* Ranks mapping is unavailable for the single-ranked memory */
+	if (priv->info.ranks > 1) {
+		priv->rank_shift[0] = ((addrmap[0] & RANK_MAX_VAL_MASK) ==
+					RANK_MAX_VAL_MASK) ? 0 : ((addrmap[0] &
+					RANK_MAX_VAL_MASK) + RANK_B0_BASE);
+	}
 }
 
 /**
-- 
2.41.0