Merge tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel into drm-next (d1031d57) · Commits · 戴 / test

drivers/gpu/drm/drm_atomic.c

+23 −16

Original line number	Diff line number	Diff line
		@@ -1515,7 +1515,8 @@ retry:
		copied_props++;
		}

		if (obj->type == DRM_MODE_OBJECT_PLANE && count_props) {
		if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
		!(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
		plane = obj_to_plane(obj);
		plane_mask \|= (1 << drm_plane_index(plane));
		plane->old_fb = plane->fb;
		@@ -1537,10 +1538,11 @@ retry:
		}

		if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
		/*
		* Unlike commit, check_only does not clean up state.
		* Below we call drm_atomic_state_free for it.
		*/
		ret = drm_atomic_check_only(state);
		/* _check_only() does not free state, unlike _commit() */
		if (!ret)
		drm_atomic_state_free(state);
		} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
		ret = drm_atomic_async_commit(state);
		} else {
		@@ -1567,14 +1569,13 @@ out:
		plane->old_fb = NULL;
		}

		if (ret == -EDEADLK) {
		drm_atomic_state_clear(state);
		drm_modeset_backoff(&ctx);
		goto retry;
		}
		if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
		/*
		* TEST_ONLY and PAGE_FLIP_EVENT are mutually exclusive,
		* if they weren't, this code should be called on success
		* for TEST_ONLY too.
		*/

		if (ret) {
		if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
		for_each_crtc_in_state(state, crtc, crtc_state, i) {
		if (!crtc_state->event)
		continue;
		@@ -1584,9 +1585,15 @@ out:
		}
		}

		drm_atomic_state_free(state);
		if (ret == -EDEADLK) {
		drm_atomic_state_clear(state);
		drm_modeset_backoff(&ctx);
		goto retry;
		}

		if (ret \|\| arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
		drm_atomic_state_free(state);

		drm_modeset_drop_locks(&ctx);
		drm_modeset_acquire_fini(&ctx);

drivers/gpu/drm/drm_dp_helper.c

+94 −5

Original line number	Diff line number	Diff line
		@@ -159,6 +159,8 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw)
		}
		EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);

		#define AUX_RETRY_INTERVAL 500 /* us */

		/**
		* DOC: dp helpers
		*
		@@ -213,7 +215,7 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
		return -EIO;

		case DP_AUX_NATIVE_REPLY_DEFER:
		usleep_range(400, 500);
		usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100);
		break;
		}
		}
		@@ -422,6 +424,90 @@ static u32 drm_dp_i2c_functionality(struct i2c_adapter *adapter)
		I2C_FUNC_10BIT_ADDR;
		}

		#define AUX_PRECHARGE_LEN 10 /* 10 to 16 */
		#define AUX_SYNC_LEN (16 + 4) /* preamble + AUX_SYNC_END */
		#define AUX_STOP_LEN 4
		#define AUX_CMD_LEN 4
		#define AUX_ADDRESS_LEN 20
		#define AUX_REPLY_PAD_LEN 4
		#define AUX_LENGTH_LEN 8

		/*
		* Calculate the duration of the AUX request/reply in usec. Gives the
		* "best" case estimate, ie. successful while as short as possible.
		*/
		static int drm_dp_aux_req_duration(const struct drm_dp_aux_msg *msg)
		{
		int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
		AUX_CMD_LEN + AUX_ADDRESS_LEN + AUX_LENGTH_LEN;

		if ((msg->request & DP_AUX_I2C_READ) == 0)
		len += msg->size * 8;

		return len;
		}

		static int drm_dp_aux_reply_duration(const struct drm_dp_aux_msg *msg)
		{
		int len = AUX_PRECHARGE_LEN + AUX_SYNC_LEN + AUX_STOP_LEN +
		AUX_CMD_LEN + AUX_REPLY_PAD_LEN;

		/*
		* For read we expect what was asked. For writes there will
		* be 0 or 1 data bytes. Assume 0 for the "best" case.
		*/
		if (msg->request & DP_AUX_I2C_READ)
		len += msg->size * 8;

		return len;
		}

		#define I2C_START_LEN 1
		#define I2C_STOP_LEN 1
		#define I2C_ADDR_LEN 9 /* ADDRESS + R/W + ACK/NACK */
		#define I2C_DATA_LEN 9 /* DATA + ACK/NACK */

		/*
		* Calculate the length of the i2c transfer in usec, assuming
		* the i2c bus speed is as specified. Gives the the "worst"
		* case estimate, ie. successful while as long as possible.
		* Doesn't account the the "MOT" bit, and instead assumes each
		* message includes a START, ADDRESS and STOP. Neither does it
		* account for additional random variables such as clock stretching.
		*/
		static int drm_dp_i2c_msg_duration(const struct drm_dp_aux_msg *msg,
		int i2c_speed_khz)
		{
		/* AUX bitrate is 1MHz, i2c bitrate as specified */
		return DIV_ROUND_UP((I2C_START_LEN + I2C_ADDR_LEN +
		msg->size * I2C_DATA_LEN +
		I2C_STOP_LEN) * 1000, i2c_speed_khz);
		}

		/*
		* Deterine how many retries should be attempted to successfully transfer
		* the specified message, based on the estimated durations of the
		* i2c and AUX transfers.
		*/
		static int drm_dp_i2c_retry_count(const struct drm_dp_aux_msg *msg,
		int i2c_speed_khz)
		{
		int aux_time_us = drm_dp_aux_req_duration(msg) +
		drm_dp_aux_reply_duration(msg);
		int i2c_time_us = drm_dp_i2c_msg_duration(msg, i2c_speed_khz);

		return DIV_ROUND_UP(i2c_time_us, aux_time_us + AUX_RETRY_INTERVAL);
		}

		/*
		* FIXME currently assumes 10 kHz as some real world devices seem
		* to require it. We should query/set the speed via DPCD if supported.
		*/
		static int dp_aux_i2c_speed_khz __read_mostly = 10;
		module_param_unsafe(dp_aux_i2c_speed_khz, int, 0644);
		MODULE_PARM_DESC(dp_aux_i2c_speed_khz,
		"Assumed speed of the i2c bus in kHz, (1-400, default 10)");

		/*
		* Transfer a single I2C-over-AUX message and handle various error conditions,
		* retrying the transaction as appropriate. It is assumed that the
		@@ -434,13 +520,16 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux aux, struct drm_dp_aux_msg msg)
		{
		unsigned int retry, defer_i2c;
		int ret;

		/*
		* DP1.2 sections 2.7.7.1.5.6.1 and 2.7.7.1.6.6.1: A DP Source device
		* is required to retry at least seven times upon receiving AUX_DEFER
		* before giving up the AUX transaction.
		*
		* We also try to account for the i2c bus speed.
		*/
		for (retry = 0, defer_i2c = 0; retry < (7 + defer_i2c); retry++) {
		int max_retries = max(7, drm_dp_i2c_retry_count(msg, dp_aux_i2c_speed_khz));

		for (retry = 0, defer_i2c = 0; retry < (max_retries + defer_i2c); retry++) {
		mutex_lock(&aux->hw_mutex);
		ret = aux->transfer(aux, msg);
		mutex_unlock(&aux->hw_mutex);
		@@ -476,7 +565,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux aux, struct drm_dp_aux_msg msg)
		* For now just defer for long enough to hopefully be
		* safe for all use-cases.
		*/
		usleep_range(500, 600);
		usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100);
		continue;

		default:
		@@ -506,7 +595,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux aux, struct drm_dp_aux_msg msg)
		aux->i2c_defer_count++;
		if (defer_i2c < 7)
		defer_i2c++;
		usleep_range(400, 500);
		usleep_range(AUX_RETRY_INTERVAL, AUX_RETRY_INTERVAL + 100);
		continue;

		default:

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