linux-kernel - [PATCH 4.9 07/41] mtd: nand: Fix timing setup for NANDs that do not support SET FEATURES

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Date:   Mon, 14 Aug 2017 18:18:17 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Alexander Dahl <ada@...rsis.com>
Subject: [PATCH 4.9 07/41] mtd: nand: Fix timing setup for NANDs that do not support SET FEATURES

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boris Brezillon <boris.brezillon@...e-electrons.com>

commit a11bf5ed951f8900d244d09eb03a888b59c7fc82 upstream.

Some ONFI NANDs do not support the SET/GET FEATURES commands, which,
according to the spec, is perfectly valid.

On these NANDs we can't set a specific timing mode using the "timing
mode" feature, and we should assume the NAND does not require any setup
to enter a specific timing mode.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Fixes: d8e725dd8311 ("mtd: nand: automate NAND timings selection")
Reported-by: Alexander Dahl <ada@...rsis.com>
Tested-by: Alexander Dahl <ada@...rsis.com>
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/nand_base.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1081,7 +1081,9 @@ static int nand_setup_data_interface(str
 	 * Ensure the timing mode has been changed on the chip side
 	 * before changing timings on the controller side.
 	 */
-	if (chip->onfi_version) {
+	if (chip->onfi_version &&
+	    (le16_to_cpu(chip->onfi_params.opt_cmd) &
+	     ONFI_OPT_CMD_SET_GET_FEATURES)) {
 		u8 tmode_param[ONFI_SUBFEATURE_PARAM_LEN] = {
 			chip->onfi_timing_mode_default,
 		};