target/linux/generic/patches-4.9/062-v4.11-0002-mtd-spi-nor-improve-macronix_quad_enable.patch

   1 From 1e99d0d51ec97bf48edd277658004ce030543d98 Mon Sep 17 00:00:00 2001
   2 From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
   3 Date: Tue, 6 Dec 2016 17:01:41 +0100
   4 Subject: [PATCH] mtd: spi-nor: improve macronix_quad_enable()
   5
   6 The patch checks whether the Quad Enable bit is already set in the Status
   7 Register. If so, the function exits immediately with a successful return
   8 code.
   9
  10 Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
  11 Reviewed-by: Jagan Teki <jagan@openedev.com>
  12 Acked-by: Marek Vasut <marek.vasut@gmail.com>
  13 ---
  14  drivers/mtd/spi-nor/spi-nor.c | 3 +++
  15  1 file changed, 3 insertions(+)
  16
  17 --- a/drivers/mtd/spi-nor/spi-nor.c
  18 +++ b/drivers/mtd/spi-nor/spi-nor.c
  19 @@ -1305,6 +1305,9 @@ static int macronix_quad_enable(struct s
  20         val = read_sr(nor);
  21         if (val < 0)
  22                 return val;
  23 +       if (val & SR_QUAD_EN_MX)
  24 +               return 0;
  25 +
  26         write_enable(nor);
  27
  28         write_sr(nor, val | SR_QUAD_EN_MX);