linux-kernel - [PATCH 02/18] EDAC/mc: Extend memtypes with LPDDR(mDDR) and LPDDR2

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Date:   Mon, 22 Aug 2022 22:14:11 +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 02/18] EDAC/mc: Extend memtypes with LPDDR(mDDR) and LPDDR2

These are normal memory types [1] which can be met on the real hardware.
DW uMCTL2 DDRC IP-core can be configured to have them supported [2,3].
Let's extend the EDAC memory types enumeration with the corresponding IDs
then.

[1] https://en.wikipedia.org/wiki/LPDDR
[2] DesignWare® Cores Enhanced Universal DDR Memory Controller (uMCTL2)
Databook, Version 3.91a, October 2020, p.501
[3] DesignWare® Cores Enhanced Universal DDR Memory Controller (uMCTL2)
Databook, Version 3.91a, October 2020, p.1717

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 drivers/edac/edac_mc.c | 2 ++
 include/linux/edac.h   | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 634c41ea7804..e353e98e01e2 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -151,10 +151,12 @@ const char * const edac_mem_types[] = {
 	[MEM_RDR]	= "Registered-SDR",
 	[MEM_DDR]	= "Unbuffered-DDR",
 	[MEM_RDDR]	= "Registered-DDR",
+	[MEM_LPDDR]	= "Low-Power-(m)DDR-RAM",
 	[MEM_RMBS]	= "RMBS",
 	[MEM_DDR2]	= "Unbuffered-DDR2",
 	[MEM_FB_DDR2]	= "FullyBuffered-DDR2",
 	[MEM_RDDR2]	= "Registered-DDR2",
+	[MEM_LPDDR2]	= "Low-Power-DDR2-RAM",
 	[MEM_XDR]	= "XDR",
 	[MEM_DDR3]	= "Unbuffered-DDR3",
 	[MEM_RDDR3]	= "Registered-DDR3",
diff --git a/include/linux/edac.h b/include/linux/edac.h
index fa4bda2a70f6..89167a4459d5 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -157,6 +157,7 @@ static inline char *mc_event_error_type(const unsigned int err_type)
  *			This is a variant of the DDR memories.
  *			A registered memory has a buffer inside it, hiding
  *			part of the memory details to the memory controller.
+ * @MEM_LPDDR:		Low-Power DDR memory (mDDR).
  * @MEM_RMBS:		Rambus DRAM, used on a few Pentium III/IV controllers.
  * @MEM_DDR2:		DDR2 RAM, as described at JEDEC JESD79-2F.
  *			Those memories are labeled as "PC2-" instead of "PC" to
@@ -167,6 +168,7 @@ static inline char *mc_event_error_type(const unsigned int err_type)
  *			a chip select signal.
  * @MEM_RDDR2:		Registered DDR2 RAM
  *			This is a variant of the DDR2 memories.
+ * @MEM_LPDDR2:		Low-Power DDR2 memory.
  * @MEM_XDR:		Rambus XDR
  *			It is an evolution of the original RAMBUS memories,
  *			created to compete with DDR2. Weren't used on any
@@ -199,10 +201,12 @@ enum mem_type {
 	MEM_RDR,
 	MEM_DDR,
 	MEM_RDDR,
+	MEM_LPDDR,
 	MEM_RMBS,
 	MEM_DDR2,
 	MEM_FB_DDR2,
 	MEM_RDDR2,
+	MEM_LPDDR2,
 	MEM_XDR,
 	MEM_DDR3,
 	MEM_RDDR3,
@@ -230,10 +234,12 @@ enum mem_type {
 #define MEM_FLAG_RDR		BIT(MEM_RDR)
 #define MEM_FLAG_DDR		BIT(MEM_DDR)
 #define MEM_FLAG_RDDR		BIT(MEM_RDDR)
+#define MEM_FLAG_LPDDR		BIT(MEM_LPDDR)
 #define MEM_FLAG_RMBS		BIT(MEM_RMBS)
 #define MEM_FLAG_DDR2		BIT(MEM_DDR2)
 #define MEM_FLAG_FB_DDR2	BIT(MEM_FB_DDR2)
 #define MEM_FLAG_RDDR2		BIT(MEM_RDDR2)
+#define MEM_FLAG_LPDDR2		BIT(MEM_LPDDR2)
 #define MEM_FLAG_XDR		BIT(MEM_XDR)
 #define MEM_FLAG_DDR3		BIT(MEM_DDR3)
 #define MEM_FLAG_RDDR3		BIT(MEM_RDDR3)
-- 
2.35.1