aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorVille Syrjälä <ville.syrjala@linux.intel.com>2015-08-27 17:23:30 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-09-08 20:22:57 +0200
commit68ec2a2a24815c0ee359b1327b60a276cd2280d8 (patch)
tree78df43d87c98e1b371cc8e4fadc931b592099dec
parentf993406182b3ffad7c53ffc180b65e2b7e3d8986 (diff)
drm/dp: Use I2C_WRITE_STATUS_UPDATE to drain partial I2C_WRITE requests
When an i2c WRITE gets an i2c defer or short i2c ack reply, we are supposed to switch the request from I2C_WRITE to I2C_WRITE_STATUS_UPDATE when we continue to poll for the completion of the request. v2: Don't assume DP_AUX_I2C_WRITE is 0 even though it is, to make the code more obvious to the casual reader (Jani) Acked-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> [danvet: Resolve conflict due to changed context.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
-rw-r--r--drivers/gpu/drm/drm_dp_helper.c43
1 files changed, 39 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 80a02a412607..5a55d905b8ee 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -422,6 +422,19 @@ static u32 drm_dp_i2c_functionality(struct i2c_adapter *adapter)
I2C_FUNC_10BIT_ADDR;
}
+static void drm_dp_i2c_msg_write_status_update(struct drm_dp_aux_msg *msg)
+{
+ /*
+ * In case of i2c defer or short i2c ack reply to a write,
+ * we need to switch to WRITE_STATUS_UPDATE to drain the
+ * rest of the message
+ */
+ if ((msg->request & ~DP_AUX_I2C_MOT) == DP_AUX_I2C_WRITE) {
+ msg->request &= DP_AUX_I2C_MOT;
+ msg->request |= DP_AUX_I2C_WRITE_STATUS_UPDATE;
+ }
+}
+
/*
* Transfer a single I2C-over-AUX message and handle various error conditions,
* retrying the transaction as appropriate. It is assumed that the
@@ -490,6 +503,8 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
* Both native ACK and I2C ACK replies received. We
* can assume the transfer was successful.
*/
+ if (ret != msg->size)
+ drm_dp_i2c_msg_write_status_update(msg);
return ret;
case DP_AUX_I2C_REPLY_NACK:
@@ -507,6 +522,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
if (defer_i2c < 7)
defer_i2c++;
usleep_range(400, 500);
+ drm_dp_i2c_msg_write_status_update(msg);
continue;
default:
@@ -519,6 +535,14 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
return -EREMOTEIO;
}
+static void drm_dp_i2c_msg_set_request(struct drm_dp_aux_msg *msg,
+ const struct i2c_msg *i2c_msg)
+{
+ msg->request = (i2c_msg->flags & I2C_M_RD) ?
+ DP_AUX_I2C_READ : DP_AUX_I2C_WRITE;
+ msg->request |= DP_AUX_I2C_MOT;
+}
+
/*
* Keep retrying drm_dp_i2c_do_msg until all data has been transferred.
*
@@ -572,10 +596,7 @@ static int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
for (i = 0; i < num; i++) {
msg.address = msgs[i].addr;
- msg.request = (msgs[i].flags & I2C_M_RD) ?
- DP_AUX_I2C_READ :
- DP_AUX_I2C_WRITE;
- msg.request |= DP_AUX_I2C_MOT;
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
/* Send a bare address packet to start the transaction.
* Zero sized messages specify an address only (bare
* address) transaction.
@@ -583,6 +604,13 @@ static int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
msg.buffer = NULL;
msg.size = 0;
err = drm_dp_i2c_do_msg(aux, &msg);
+
+ /*
+ * Reset msg.request in case in case it got
+ * changed into a WRITE_STATUS_UPDATE.
+ */
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
+
if (err < 0)
break;
/* We want each transaction to be as large as possible, but
@@ -595,6 +623,13 @@ static int drm_dp_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
msg.size = min(transfer_size, msgs[i].len - j);
err = drm_dp_i2c_drain_msg(aux, &msg);
+
+ /*
+ * Reset msg.request in case in case it got
+ * changed into a WRITE_STATUS_UPDATE.
+ */
+ drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
+
if (err < 0)
break;
transfer_size = err;

Privacy Policy