linux-kernel - [PATCH 2/2] drm/vc4: Update kerneldoc about CEC and power management

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Message-Id: <20170920225935.14566-2-eric@anholt.net>
Date:   Wed, 20 Sep 2017 15:59:35 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: [PATCH 2/2] drm/vc4: Update kerneldoc about CEC and power management

Boris had added full power management, and then Hans partially removed
it to enable CEC, so update the docs about both.

Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 65826a4f208e..ce18384c6be3 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -33,13 +33,9 @@
  * interconnect) bus to the encoder side for insertion into the video
  * blank regions.
  *
- * The driver's HDMI encoder does not yet support power management.
- * The HDMI encoder's power domain and the HSM/pixel clocks are kept
- * continuously running, and only the HDMI logic and packet ram are
- * powered off/on at disable/enable time.
- *
- * The driver does not yet support CEC control, though the HDMI
- * encoder block has CEC support.
+ * Note that HDMI CEC requires that the HSM clock be running even when
+ * not scanning out, so that input can be processed.  The PHY is still
+ * powered down when not scanning out, though.
  */
 
 #include <drm/drm_atomic_helper.h>
-- 
2.14.1