linux-kernel - [PATCH 4.15 063/128] mtd: nand: ifc: update bufnum mask for ver >= 2.0.0

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Date:   Fri, 16 Mar 2018 16:23:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jagdish Gediya <jagdish.gediya@....com>,
        Prabhakar Kushwaha <prabhakar.kushwaha@....com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 063/128] mtd: nand: ifc: update bufnum mask for ver >= 2.0.0

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

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

From: Jagdish Gediya <jagdish.gediya@....com>


[ Upstream commit bccb06c353af3764ca86d9da47652458e6c2eb41 ]

Bufnum mask is used to calculate page position in the internal SRAM.

As IFC version 2.0.0 has 16KB of internal SRAM as compared to older
versions which had 8KB. Hence bufnum mask needs to be updated.

Signed-off-by: Jagdish Gediya <jagdish.gediya@....com>
Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@....com>
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mtd/nand/fsl_ifc_nand.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -916,6 +916,13 @@ static int fsl_ifc_chip_init(struct fsl_
 	if (ctrl->version >= FSL_IFC_VERSION_1_1_0)
 		fsl_ifc_sram_init(priv);
 
+	/*
+	 * As IFC version 2.0.0 has 16KB of internal SRAM as compared to older
+	 * versions which had 8KB. Hence bufnum mask needs to be updated.
+	 */
+	if (ctrl->version >= FSL_IFC_VERSION_2_0_0)
+		priv->bufnum_mask = (priv->bufnum_mask * 2) + 1;
+
 	return 0;
 }