Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a6c8aff0 authored by Jani Nikula's avatar Jani Nikula Committed by Christian König
Browse files

drm/i915: support address only i2c-over-aux transactions 



To support bare address requests used by the drm dp helpers.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent 1ca20305

drivers/gpu/drm/i915/intel_dp.c

+4 −3
Original line number Diff line number Diff line
@@ -575,7 +575,8 @@ intel_dp_aux_ch(struct intel_dp *intel_dp, 
	return ret;

}



#define HEADER_SIZE	4

#define BARE_ADDRESS_SIZE	3

#define HEADER_SIZE		(BARE_ADDRESS_SIZE + 1)

static ssize_t

intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)

{
@@ -592,7 +593,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 
	switch (msg->request & ~DP_AUX_I2C_MOT) {

	case DP_AUX_NATIVE_WRITE:

	case DP_AUX_I2C_WRITE:

		txsize = HEADER_SIZE + msg->size;

		txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;

		rxsize = 1;



		if (WARN_ON(txsize > 20))
@@ -611,7 +612,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 


	case DP_AUX_NATIVE_READ:

	case DP_AUX_I2C_READ:

		txsize = HEADER_SIZE;

		txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;

		rxsize = msg->size + 1;



		if (WARN_ON(rxsize > 20))