diff options
| -rw-r--r-- | Documentation/DocBook/drm.tmpl | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 21 | ||||
| -rw-r--r-- | include/drm/drm_dp_helper.h | 8 |
3 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl index cb8024e62dfc..4ee2304f82f9 100644 --- a/Documentation/DocBook/drm.tmpl +++ b/Documentation/DocBook/drm.tmpl @@ -2105,6 +2105,12 @@ void intel_crt_init(struct drm_device *dev) !Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers !Edrivers/gpu/drm/drm_fb_helper.c </sect2> + <sect2> + <title>Display Port Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_dp_helper.c dp helpers +!Iinclude/drm/drm_dp_helper.h +!Edrivers/gpu/drm/drm_dp_helper.c + </sect2> </sect1> <!-- Internals: vertical blanking --> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 3c4cccd0d753..89e196627160 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -30,6 +30,15 @@ #include <drm/drm_dp_helper.h> #include <drm/drmP.h> +/** + * DOC: dp helpers + * + * These functions contain some common logic and helpers at various abstraction + * levels to deal with Display Port sink devices and related things like DP aux + * channel transfers, EDID reading over DP aux channels, decoding certain DPCD + * blocks, ... + */ + /* Run a single AUX_CH I2C transaction, writing/reading data as necessary */ static int i2c_algo_dp_aux_transaction(struct i2c_adapter *adapter, int mode, @@ -193,6 +202,18 @@ i2c_dp_aux_prepare_bus(struct i2c_adapter *adapter) return 0; } +/** + * i2c_dp_aux_add_bus() - register an i2c adapter using the aux ch helper + * @adapter: i2c adapter to register + * + * This registers an i2c adapater that uses dp aux channel as it's underlaying + * transport. The driver needs to fill out the &i2c_algo_dp_aux_data structure + * and store it in the algo_data member of the @adapter argument. This will be + * used by the i2c over dp aux algorithm to drive the hardware. + * + * RETURNS: + * 0 on success, -ERRNO on failure. + */ int i2c_dp_aux_add_bus(struct i2c_adapter *adapter) { diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index c09d36741c94..e8e1417af3d9 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -312,6 +312,14 @@ #define MODE_I2C_READ 4 #define MODE_I2C_STOP 8 +/** + * struct i2c_algo_dp_aux_data - driver interface structure for i2c over dp + * aux algorithm + * @running: set by the algo indicating whether an i2c is ongoing or whether + * the i2c bus is quiescent + * @address: i2c target address for the currently ongoing transfer + * @aux_ch: driver callback to transfer a single byte of the i2c payload + */ struct i2c_algo_dp_aux_data { bool running; u16 address; |