pending-4.9/drm-bridge-adv7511-fix-low-refresh-rate-selection.patch

   1 From 338758b28a27bdc4bf446b10dca953f0e4380a38 Mon Sep 17 00:00:00 2001
   2 From: Matt Redfearn <matt.redfearn@thinci.com>
   3 Date: Wed, 24 Apr 2019 13:22:27 +0000
   4 Subject: drm/bridge: adv7511: Fix low refresh rate selection
   5
   6 [ Upstream commit 67793bd3b3948dc8c8384b6430e036a30a0ecb43 ]
   7
   8 The driver currently sets register 0xfb (Low Refresh Rate) based on the
   9 value of mode->vrefresh. Firstly, this field is specified to be in Hz,
  10 but the magic numbers used by the code are Hz * 1000. This essentially
  11 leads to the low refresh rate always being set to 0x01, since the
  12 vrefresh value will always be less than 24000. Fix the magic numbers to
  13 be in Hz.
  14 Secondly, according to the comment in drm_modes.h, the field is not
  15 supposed to be used in a functional way anyway. Instead, use the helper
  16 function drm_mode_vrefresh().
  17
  18 Fixes: 9c8af882bf12 ("drm: Add adv7511 encoder driver")
  19 Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  20 Signed-off-by: Matt Redfearn <matt.redfearn@thinci.com>
  21 Signed-off-by: Sean Paul <seanpaul@chromium.org>
  22 Link: https://patchwork.freedesktop.org/patch/msgid/20190424132210.26338-1-matt.redfearn@thinci.com
  23 Signed-off-by: Sasha Levin <sashal@kernel.org>
  24 ---
  25  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 6 +++---
  26  1 file changed, 3 insertions(+), 3 deletions(-)
  27
  28 diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
  29 index 32ab5c32834b..1b2fae915ecc 100644
  30 --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
  31 +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
  32 @@ -735,11 +735,11 @@ static void adv7511_mode_set(struct adv7511 *adv7511,
  33                         vsync_polarity = 1;
  34         }
  35
  36 -       if (mode->vrefresh <= 24000)
  37 +       if (drm_mode_vrefresh(mode) <= 24)
  38                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_24HZ;
  39 -       else if (mode->vrefresh <= 25000)
  40 +       else if (drm_mode_vrefresh(mode) <= 25)
  41                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_25HZ;
  42 -       else if (mode->vrefresh <= 30000)
  43 +       else if (drm_mode_vrefresh(mode) <= 30)
  44                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_30HZ;
  45         else
  46                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
  47 --
  48 2.20.1
  49