summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_dp_helper.c
diff options
context:
space:
mode:
authorThierry Reding <treding@nvidia.com>2013-11-28 11:31:00 +0100
committerThierry Reding <treding@nvidia.com>2014-02-26 17:21:32 +0100
commitc197db75ff5c1d4f015c7668a3715e230a5d7e27 (patch)
tree9ba1ee03f90e51548bb4c1d9533b81e87fa04539 /drivers/gpu/drm/drm_dp_helper.c
parent38dbfb59d1175ef458d006556061adeaa8751b72 (diff)
downloadop-kernel-dev-c197db75ff5c1d4f015c7668a3715e230a5d7e27.zip
op-kernel-dev-c197db75ff5c1d4f015c7668a3715e230a5d7e27.tar.gz
drm/dp: Add AUX channel infrastructure
This is a superset of the current i2c_dp_aux bus functionality and can be used to transfer native AUX in addition to I2C-over-AUX messages. Helpers are provided to read and write the DPCD, either blockwise or byte-wise. Many of the existing helpers for DisplayPort take a copy of a portion of the DPCD and operate on that, without a way to write data back to the DPCD (e.g. for configuration of the link). Subsequent patches will build upon this infrastructure to provide common functionality in a generic way. Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Thierry Reding <treding@nvidia.com> --- Changes in v5: - move comments partially to struct drm_dp_aux_msg in header file - return -EPROTO on short reads in DPCD helpers Changes in v4: - fix a typo in a comment Changes in v3: - reorder drm_dp_dpcd_writeb() arguments to be more intuitive - return number of bytes transferred in drm_dp_dpcd_write() - factor out drm_dp_dpcd_access() - describe error codes
Diffstat (limited to 'drivers/gpu/drm/drm_dp_helper.c')
-rw-r--r--drivers/gpu/drm/drm_dp_helper.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 9e978aa..da6bcfe 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -346,3 +346,113 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw)
}
}
EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
+
+/**
+ * DOC: dp helpers
+ *
+ * The DisplayPort AUX channel is an abstraction to allow generic, driver-
+ * independent access to AUX functionality. Drivers can take advantage of
+ * this by filling in the fields of the drm_dp_aux structure.
+ *
+ * Transactions are described using a hardware-independent drm_dp_aux_msg
+ * structure, which is passed into a driver's .transfer() implementation.
+ * Both native and I2C-over-AUX transactions are supported.
+ *
+ * An AUX channel can also be used to transport I2C messages to a sink. A
+ * typical application of that is to access an EDID that's present in the
+ * sink device. The .transfer() function can also be used to execute such
+ * transactions. The drm_dp_aux_register_i2c_bus() function registers an
+ * I2C adapter that can be passed to drm_probe_ddc(). Upon removal, drivers
+ * should call drm_dp_aux_unregister_i2c_bus() to remove the I2C adapter.
+ */
+
+static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
+ unsigned int offset, void *buffer, size_t size)
+{
+ struct drm_dp_aux_msg msg;
+ unsigned int retry;
+ int err;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.address = offset;
+ msg.request = request;
+ msg.buffer = buffer;
+ msg.size = size;
+
+ /*
+ * The specification doesn't give any recommendation on how often to
+ * retry native transactions, so retry 7 times like for I2C-over-AUX
+ * transactions.
+ */
+ for (retry = 0; retry < 7; retry++) {
+ err = aux->transfer(aux, &msg);
+ if (err < 0) {
+ if (err == -EBUSY)
+ continue;
+
+ return err;
+ }
+
+ if (err < size)
+ return -EPROTO;
+
+ switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) {
+ case DP_AUX_NATIVE_REPLY_ACK:
+ return err;
+
+ case DP_AUX_NATIVE_REPLY_NACK:
+ return -EIO;
+
+ case DP_AUX_NATIVE_REPLY_DEFER:
+ usleep_range(400, 500);
+ break;
+ }
+ }
+
+ DRM_ERROR("too many retries, giving up\n");
+ return -EIO;
+}
+
+/**
+ * drm_dp_dpcd_read() - read a series of bytes from the DPCD
+ * @aux: DisplayPort AUX channel
+ * @offset: address of the (first) register to read
+ * @buffer: buffer to store the register values
+ * @size: number of bytes in @buffer
+ *
+ * Returns the number of bytes transferred on success, or a negative error
+ * code on failure. -EIO is returned if the request was NAKed by the sink or
+ * if the retry count was exceeded. If not all bytes were transferred, this
+ * function returns -EPROTO. Errors from the underlying AUX channel transfer
+ * function, with the exception of -EBUSY (which causes the transaction to
+ * be retried), are propagated to the caller.
+ */
+ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
+ void *buffer, size_t size)
+{
+ return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, offset, buffer,
+ size);
+}
+EXPORT_SYMBOL(drm_dp_dpcd_read);
+
+/**
+ * drm_dp_dpcd_write() - write a series of bytes to the DPCD
+ * @aux: DisplayPort AUX channel
+ * @offset: address of the (first) register to write
+ * @buffer: buffer containing the values to write
+ * @size: number of bytes in @buffer
+ *
+ * Returns the number of bytes transferred on success, or a negative error
+ * code on failure. -EIO is returned if the request was NAKed by the sink or
+ * if the retry count was exceeded. If not all bytes were transferred, this
+ * function returns -EPROTO. Errors from the underlying AUX channel transfer
+ * function, with the exception of -EBUSY (which causes the transaction to
+ * be retried), are propagated to the caller.
+ */
+ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset,
+ void *buffer, size_t size)
+{
+ return drm_dp_dpcd_access(aux, DP_AUX_NATIVE_WRITE, offset, buffer,
+ size);
+}
+EXPORT_SYMBOL(drm_dp_dpcd_write);
OpenPOWER on IntegriCloud