package/boot/uboot-sunxi/patches/012-sun6i-fix-clock_twi_onoff.patch

   1 From 730d2f3a41c5ccae71b5008fffdf697d143be68c Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Wed, 16 Mar 2016 20:44:51 +0100
   4 Subject: [PATCH] sunxi: Fix clock_twi_onoff for sun6i
   5
   6 The clock_sun6i.c implementation was not deasserting the reset for
   7 the regular i2c controllers, this commit fixes this.
   8
   9 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  10 Acked-by: Ian Campbell <ijc@hellion.org.uk>
  11 ---
  12  arch/arm/cpu/armv7/sunxi/clock_sun6i.c | 11 ++++++++---
  13  1 file changed, 8 insertions(+), 3 deletions(-)
  14
  15 --- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
  16 +++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
  17 @@ -100,13 +100,18 @@ int clock_twi_onoff(int port, int state)
  18                 return 0;
  19         }
  20
  21 -       /* set the apb clock gate for twi */
  22 -       if (state)
  23 +       /* set the apb clock gate and reset for twi */
  24 +       if (state) {
  25                 setbits_le32(&ccm->apb2_gate,
  26                              CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
  27 -       else
  28 +               setbits_le32(&ccm->apb2_reset_cfg,
  29 +                            1 << (APB2_RESET_TWI_SHIFT + port));
  30 +       } else {
  31 +               clrbits_le32(&ccm->apb2_reset_cfg,
  32 +                            1 << (APB2_RESET_TWI_SHIFT + port));
  33                 clrbits_le32(&ccm->apb2_gate,
  34                              CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
  35 +       }
  36
  37         return 0;
  38  }