Commit 562d2dd8 authored by Jason Yen's avatar Jason Yen Committed by Douglas Anderson
Browse files

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: default avatarJason Yen <jason.yen@paradetech.corp-partner.google.com>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Signed-off-by: default avatarDouglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220930042506.2529522-1-jason.yen@paradetech.corp-partner.google.com
parent 65b698bf

drivers/gpu/drm/bridge/parade-ps8640.c

+8 −1
Original line number Diff line number Diff line
@@ -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: