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drm/bridge: ps8640: Add software to support aux defer

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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
This commit is contained in:
Jason Yen 2022-09-30 12:25:06 +08:00 committed by Douglas Anderson
parent 65b698bf40
commit 562d2dd870
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/bridge/parade-ps8640.c
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@ -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: