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

[Jani Nikula]

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

Signed-off-by: Jani Nikula <jani.nikula at intel.com>

---

Hi Alex, similar to Thierry's patch for i915.

BR,
Jani.
---
 drivers/gpu/drm/i915/intel_dp.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e48d47ced57b..b435d07fbc08 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -575,7 +575,8 @@ out:
        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))
-- 
1.7.9.5