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Merge tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel into drm-next

Browse source 
bunch of drm fixes.

* tag 'topic/drm-fixes-2015-09-09' of git://anongit.freedesktop.org/drm-intel:
  drm/dp: Add dp_aux_i2c_speed_khz module param to set the assume i2c bus speed
  drm/dp: Adjust i2c-over-aux retry count based on message size and i2c bus speed
  drm/dp: Define AUX_RETRY_INTERVAL as 500 us
  drm/atomic: Fix bookkeeping with TEST_ONLY, v3.
This commit is contained in:
Dave Airlie 2015-09-11 10:52:37 +10:00
commit d1031d576d
2 changed files with 117 additions and 21 deletions
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39
drivers/gpu/drm/drm_atomic.c
View file

@ -1515,7 +1515,8 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
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 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
}
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 {
@ -1567,25 +1569,30 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
plane->old_fb = NULL;
}
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.
*/
for_each_crtc_in_state(state, crtc, crtc_state, i) {
if (!crtc_state->event)
continue;
destroy_vblank_event(dev, file_priv,
crtc_state->event);
}
}
if (ret == -EDEADLK) {
drm_atomic_state_clear(state);
drm_modeset_backoff(&ctx);
goto retry;
}
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;
destroy_vblank_event(dev, file_priv,
crtc_state->event);
}
}
if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
drm_atomic_state_free(state);
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);

99
drivers/gpu/drm/drm_dp_helper.c
View file

@ -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: