This is a note to let you know that I've just added the patch titled
drm/bridge: adv7511: Re-write the i2c address before EDID probing
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-adv7511-re-write-the-i2c-address-before-edid-probing.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3587c856675c45809010c2cee5b21096f6e8e938 Mon Sep 17 00:00:00 2001
From: John Stultz <john.stultz@xxxxxxxxxx>
Date: Mon, 16 Jan 2017 16:52:52 -0800
Subject: drm/bridge: adv7511: Re-write the i2c address before EDID probing
From: John Stultz <john.stultz@xxxxxxxxxx>
commit 3587c856675c45809010c2cee5b21096f6e8e938 upstream.
I've found that by just turning the chip on and off via the
POWER_DOWN register, I end up getting i2c_transfer errors on
HiKey.
Investigating further, it turns out that some of the register
state in hardware is getting lost, as the device registers are
reset when the chip is powered down.
Thus this patch simply re-writes the i2c address to the
ADV7511_REG_EDID_I2C_ADDR register to ensure its properly set
before we try to read the EDID data.
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
Cc: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Tested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1484614372-15342-7-git-send-email-john.stultz@xxxxxxxxxx
Signed-off-by: Nhan Nguyen <nhan.nguyen.yb@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -573,9 +573,17 @@ static int adv7511_get_modes(struct adv7
unsigned int count;
/* Reading the EDID only works if the device is powered */
- if (!adv7511->powered)
+ if (!adv7511->powered) {
+ unsigned int edid_i2c_addr =
+ (adv7511->i2c_main->addr << 1) + 4;
+
__adv7511_power_on(adv7511);
+ /* Reset the EDID_I2C_ADDR register as it might be cleared */
+ regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR,
+ edid_i2c_addr);
+ }
+
edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
if (!adv7511->powered)
Patches currently in stable-queue which might be from john.stultz@xxxxxxxxxx are
queue-4.9/drm-bridge-adv7511-re-write-the-i2c-address-before-edid-probing.patch
queue-4.9/drm-bridge-adv7511-rework-adv7511_power_on-off-so-they-can-be-reused-internally.patch
queue-4.9/drm-bridge-adv7511-reuse-__adv7511_power_on-off-when-probing-edid.patch