linux-kernel - [PATCH 06/12] drm/dp: fix drm_dp_link_power

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Message-ID: <1530612152-27555-7-git-send-email-dkos@cadence.com>
Date:   Tue, 3 Jul 2018 11:02:17 +0100
From:   Damian Kos <dkos@...ence.com>
To:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Damian Kos <dkos@...ence.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>
CC:     <ltyrala@...ence.com>, <pgaj@...ence.com>, <stelford@...ence.com>,
        "Quentin Schulz" <quentin.schulz@...e-electrons.com>
Subject: [PATCH 06/12] drm/dp: fix drm_dp_link_power_* for DP 1.2+

From: Quentin Schulz <quentin.schulz@...e-electrons.com>

In DP 1.1, DP_SET_POWER had only two bits for the power state (D0 or D3
and two other reserved values), thus DP_SET_POWER_MASK being 0x3.

However, since DP 1.2, DP_SET_POWER has 3 bits (same values for D0 and
D3, a mixed D3 which leaves only AUX powered and five other reserved
values). Thus, we need to expand DP_SET_POWER_MASK to 3 bits (thus 0x7).

It is safe to expand DP_SET_POWER_MASK to 3 bits since bit 2 in DP 1.1
is reserved and read 0.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
Signed-off-by: Damian Kos <dkos@...ence.com>
---
 include/drm/drm_dp_helper.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index bd593df..a63a548 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -671,7 +671,7 @@
 #define DP_SET_POWER                        0x600
 # define DP_SET_POWER_D0                    0x1
 # define DP_SET_POWER_D3                    0x2
-# define DP_SET_POWER_MASK                  0x3
+# define DP_SET_POWER_MASK                  0x7
 # define DP_SET_POWER_D3_AUX_ON             0x5
 
 #define DP_EDP_DPCD_REV			    0x700    /* eDP 1.2 */
-- 
1.7.1