From 562d2dd8702806c636ba81c43b23394b29c60acc Mon Sep 17 00:00:00 2001
From: Jason Yen <jason.yen@paradetech.corp-partner.google.com>
Date: Fri, 30 Sep 2022 12:25:06 +0800
Subject: drm/bridge: ps8640: Add software to support aux defer
This chip can not handle aux defer if the host directly program
its aux registers to access edid/dpcd. So we need let software
to handle the aux defer situation.
Signed-off-by: Jason Yen <jason.yen@paradetech.corp-partner.google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220930042506.2529522-1-jason.yen@paradetech.corp-partner.google.com
---
drivers/gpu/drm/bridge/parade-ps8640.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
(limited to 'drivers/gpu')
diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index d7483c13c569..5be6562c2a19 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -286,7 +286,6 @@ static ssize_t ps8640_aux_transfer_msg(struct drm_dp_aux *aux,
}
switch (data & SWAUX_STATUS_MASK) {
- /* Ignore the DEFER cases as they are already handled in hardware */
case SWAUX_STATUS_NACK:
case SWAUX_STATUS_I2C_NACK:
/*
@@ -303,6 +302,14 @@ static ssize_t ps8640_aux_transfer_msg(struct drm_dp_aux *aux,
case SWAUX_STATUS_ACKM:
len = data & SWAUX_M_MASK;
break;
+ case SWAUX_STATUS_DEFER:
+ case SWAUX_STATUS_I2C_DEFER:
+ if (is_native_aux)
+ msg->reply |= DP_AUX_NATIVE_REPLY_DEFER;
+ else
+ msg->reply |= DP_AUX_I2C_REPLY_DEFER;
+ len = data & SWAUX_M_MASK;
+ break;
case SWAUX_STATUS_INVALID:
return -EOPNOTSUPP;
case SWAUX_STATUS_TIMEOUT:
--
cgit