linux-kernel - [DEBUG] mtd: spi-nor: dump DWORDs of the Basic Flash Parameter Table

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Date:   Thu,  7 Sep 2017 20:54:56 +0200
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     marek.vasut@...il.com, linux-mtd@...ts.infradead.org,
        geert@...ux-m68k.org
Cc:     computersforpeace@...il.com, dwmw2@...radead.org,
        boris.brezillon@...e-electrons.com, richard@....at,
        linux-kernel@...r.kernel.org,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Subject: [DEBUG] mtd: spi-nor: dump DWORDs of the Basic Flash Parameter Table

debug purpose only, should not be merged!

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
---

Hi Geert,

Can you apply this patch on your tree then report me what was printed, please?
I have an idea of the root cause of your issue then a potential work-around
but I first need to validate my assumption to confirm that the work-around
would actually work.

For instance, here is what I get with a Macronix MX25L25673G (same JEDEC ID as
MX25L25635E):

[    0.700000] atmel_qspi f0020000.spi: DWORD1 = 0xfffb20e5
[    0.710000] atmel_qspi f0020000.spi: DWORD2 = 0x0fffffff
[    0.710000] atmel_qspi f0020000.spi: DWORD3 = 0x6b08eb44
[    0.720000] atmel_qspi f0020000.spi: DWORD4 = 0xbb043b08
[    0.720000] atmel_qspi f0020000.spi: DWORD5 = 0xfffffffe
[    0.720000] atmel_qspi f0020000.spi: DWORD6 = 0xff00ffff
[    0.730000] atmel_qspi f0020000.spi: DWORD7 = 0xeb44ffff
[    0.730000] atmel_qspi f0020000.spi: DWORD8 = 0x520f200c
[    0.740000] atmel_qspi f0020000.spi: DWORD9 = 0xff00d810
[    0.740000] atmel_qspi f0020000.spi: DWORD10 = 0x00dd59d6
[    0.740000] atmel_qspi f0020000.spi: DWORD11 = 0xdb039f82
[    0.750000] atmel_qspi f0020000.spi: DWORD12 = 0x38670344
[    0.750000] atmel_qspi f0020000.spi: DWORD13 = 0xb030b030
[    0.760000] atmel_qspi f0020000.spi: DWORD14 = 0x5cd5bdf7
[    0.760000] atmel_qspi f0020000.spi: DWORD15 = 0xff299e4a
[    0.760000] atmel_qspi f0020000.spi: DWORD16 = 0x85f950f0
[    0.770000] atmel_qspi f0020000.spi: BFPT version 1.6 (length = 16)
[    0.770000] atmel_qspi f0020000.spi: mx25l25635e (32768 Kbytes)

Best regards,

Cyrille

 drivers/mtd/spi-nor/spi-nor.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 05254dd6a4a0..5066d99b9f50 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2136,8 +2136,14 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 		return err;
 
 	/* Fix endianness of the BFPT DWORDs. */
-	for (i = 0; i < BFPT_DWORD_MAX; i++)
+	for (i = 0; i < BFPT_DWORD_MAX; i++) {
 		bfpt.dwords[i] = le32_to_cpu(bfpt.dwords[i]);
+		dev_info(nor->dev, "DWORD%d = 0x%08x\n", i + 1, bfpt.dwords[i]);
+	}
+	dev_info(nor->dev, "BFPT version %d.%d (length = %u)\n",
+		 bfpt_header->major,
+		 bfpt_header->minor,
+		 bfpt_header->length);
 
 	/* Number of address bytes. */
 	switch (bfpt.dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) {
-- 
2.11.0