From 562d2dd8702806c636ba81c43b23394b29c60acc Mon Sep 17 00:00:00 2001 From: Jason Yen 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 Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson 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/drm/bridge') 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 v1.2.3