linux-kernel - [PATCH RESEND v2 08/18] EDAC/synopsys: Parse ADDRMAP[0] CSR for multi-ranks case only

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Date:   Sat, 10 Sep 2022 22:49:57 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Michal Simek <michal.simek@...inx.com>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Michail Ivanov <Michail.Ivanov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Punnaiah Choudary Kalluri 
        <punnaiah.choudary.kalluri@...inx.com>,
        Manish Narani <manish.narani@...inx.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND v2 08/18] EDAC/synopsys: Parse ADDRMAP[0] CSR for multi-ranks case only

The ADDRMAP[0] CSR contains the SDRAM Rank bits mapping. Obviously it's
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 may contain garbage data. So make sure
the ADDRMAP[0] register is only parsed if the multi-ranked memory setup
has been detected.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 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 a55ae7ff931c..87acb683ab5c 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -1143,9 +1143,12 @@ 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);
+	}
 }
 
 /**
-- 
2.37.2