34  * DOC: dp dual mode helpers
36  * Helper functions to deal with DP dual mode (aka. DP++) adaptors.
43  * I2C-over-AUX. Source devices may choose to implement either of these
50  * drm_dp_dual_mode_read - Read from the DP dual mode adaptor register(s)
56  * Reads @size bytes from the DP dual mode adaptor registers
85 		return -EPROTO;  in drm_dp_dual_mode_read()
92  * drm_dp_dual_mode_write - Write to the DP dual mode adaptor register(s)
98  * Writes @size bytes to the DP dual mode adaptor registers
118 		return -ENOMEM;  in drm_dp_dual_mode_write()
132 		return -EPROTO;  in drm_dp_dual_mode_write()
141 		"DP-HDMI ADAPTOR\x04";  in is_hdmi_adaptor()
167  * drm_dp_dual_mode_detect - Identify the DP dual mode adaptor
170  * Attempt to identify the type of the DP dual mode adaptor used.
173  * certain whether we're dealing with a native HDMI port or
174  * a type 1 DVI dual mode adaptor. The driver will have to use
179  * The type of the DP dual mode adaptor used
198 	 * port or a native HDMI port. Both of these methods are entirely  in drm_dp_dual_mode_detect()
203 	DRM_DEBUG_KMS("DP dual mode HDMI ID: %*pE (err %zd)\n",  in drm_dp_dual_mode_detect()
222 	DRM_DEBUG_KMS("DP dual mode adaptor ID: %02x (err %zd)\n",  in drm_dp_dual_mode_detect()
239 			DRM_ERROR("Unexpected DP dual mode adaptor ID %02x\n",  in drm_dp_dual_mode_detect()
252  * drm_dp_dual_mode_max_tmds_clock - Max TMDS clock for DP dual mode adaptor
253  * @type: DP dual mode adaptor type
257  * type of the dual mode adaptor and the DP_DUAL_MODE_MAX_TMDS_CLOCK
264  * Maximum supported TMDS clock rate for the DP dual mode adaptor in kHz.
272 	/* native HDMI so no limit */  in drm_dp_dual_mode_max_tmds_clock()
295 …* drm_dp_dual_mode_get_tmds_output - Get the state of the TMDS output buffers in the DP dual mode …
296  * @type: DP dual mode adaptor type
336  * drm_dp_dual_mode_set_tmds_output - Enable/disable TMDS output buffers in the DP dual mode adaptor
337  * @type: DP dual mode adaptor type
345  * making this function a no-op on type 1 adaptors.
361 	 * LSPCON adapters in low-power state may ignore the first write, so  in drm_dp_dual_mode_set_tmds_output()
392 	return -EIO;  in drm_dp_dual_mode_set_tmds_output()
397  * drm_dp_get_dual_mode_type_name - Get the name of the DP dual mode adaptor type as a string
398  * @type: DP dual mode adaptor type
401  * String representation of the DP dual mode adaptor type
426  * drm_lspcon_get_mode: Get LSPCON's current mode of operation by
428  * @adapter: I2C-over-aux adapter
429  * @mode: current lspcon mode of operation output variable
432  * 0 on success, sets the current_mode value to appropriate mode
433  * -error on failure
436 			enum drm_lspcon_mode *mode)  in drm_lspcon_get_mode()  argument
442 	if (!mode) {  in drm_lspcon_get_mode()
444 		return -EINVAL;  in drm_lspcon_get_mode()
461 		return -EFAULT;  in drm_lspcon_get_mode()
465 		*mode = DRM_LSPCON_MODE_PCON;  in drm_lspcon_get_mode()
467 		*mode = DRM_LSPCON_MODE_LS;  in drm_lspcon_get_mode()
473  * drm_lspcon_set_mode: Change LSPCON's mode of operation by
475  * @adapter: I2C-over-aux adapter
476  * @mode: required mode of operation
479  * 0 on success, -error on failure/timeout
482 			enum drm_lspcon_mode mode)  in drm_lspcon_set_mode()  argument
489 	if (mode == DRM_LSPCON_MODE_PCON)  in drm_lspcon_set_mode()
492 	/* Change mode */  in drm_lspcon_set_mode()
496 		DRM_ERROR("LSPCON mode change failed\n");  in drm_lspcon_set_mode()
501 	 * Confirm mode change by reading the status bit.  in drm_lspcon_set_mode()
502 	 * Sometimes, it takes a while to change the mode,  in drm_lspcon_set_mode()
508 			DRM_ERROR("can't confirm LSPCON mode change\n");  in drm_lspcon_set_mode()
511 			if (current_mode != mode) {  in drm_lspcon_set_mode()
513 				time_out -= 10;  in drm_lspcon_set_mode()
515 				DRM_DEBUG_KMS("LSPCON mode changed to %s\n",  in drm_lspcon_set_mode()
516 						mode == DRM_LSPCON_MODE_LS ?  in drm_lspcon_set_mode()
523 	DRM_ERROR("LSPCON mode change timed out\n");  in drm_lspcon_set_mode()
524 	return -ETIMEDOUT;  in drm_lspcon_set_mode()