Rather than have both drm_dp_aux lock within its transfer, and i2c to
lock around the transfer, use the same lock by filling in the locking
callbacks that i2c wants to use. We require our own hw_mutex as we
bypass i2c_transfer for drm_dp_dpcd_access().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466152398-20157-2-git-send-email-chris@chris-wilson.co.uk
memset(&msg, 0, sizeof(msg));
memset(&msg, 0, sizeof(msg));
- mutex_lock(&aux->hw_mutex);
-
for (i = 0; i < num; i++) {
msg.address = msgs[i].addr;
drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
for (i = 0; i < num; i++) {
msg.address = msgs[i].addr;
drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
msg.size = 0;
(void)drm_dp_i2c_do_msg(aux, &msg);
msg.size = 0;
(void)drm_dp_i2c_do_msg(aux, &msg);
- mutex_unlock(&aux->hw_mutex);
-
.master_xfer = drm_dp_i2c_xfer,
};
.master_xfer = drm_dp_i2c_xfer,
};
+static struct drm_dp_aux *i2c_to_aux(struct i2c_adapter *i2c)
+{
+ return container_of(i2c, struct drm_dp_aux, ddc);
+}
+
+static void lock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ mutex_lock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
+static int trylock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ return mutex_trylock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
+static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags)
+{
+ mutex_unlock(&i2c_to_aux(i2c)->hw_mutex);
+}
+
/**
* drm_dp_aux_register() - initialise and register aux channel
* @aux: DisplayPort AUX channel
/**
* drm_dp_aux_register() - initialise and register aux channel
* @aux: DisplayPort AUX channel
aux->ddc.algo_data = aux;
aux->ddc.retries = 3;
aux->ddc.algo_data = aux;
aux->ddc.retries = 3;
+ aux->ddc.lock_bus = lock_bus;
+ aux->ddc.trylock_bus = trylock_bus;
+ aux->ddc.unlock_bus = unlock_bus;
+
aux->ddc.class = I2C_CLASS_DDC;
aux->ddc.owner = THIS_MODULE;
aux->ddc.dev.parent = aux->dev;
aux->ddc.class = I2C_CLASS_DDC;
aux->ddc.owner = THIS_MODULE;
aux->ddc.dev.parent = aux->dev;