-static void idetape_calculate_speeds(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (time_after(jiffies,
- tape->controlled_pipeline_head_time + 120 * HZ)) {
- tape->controlled_previous_pipeline_head =
- tape->controlled_last_pipeline_head;
- tape->controlled_previous_head_time =
- tape->controlled_pipeline_head_time;
- tape->controlled_last_pipeline_head = tape->pipeline_head;
- tape->controlled_pipeline_head_time = jiffies;
- }
- if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
- tape->controlled_pipeline_head_speed = (tape->pipeline_head -
- tape->controlled_last_pipeline_head) * 32 * HZ /
- (jiffies - tape->controlled_pipeline_head_time);
- else if (time_after(jiffies, tape->controlled_previous_head_time))
- tape->controlled_pipeline_head_speed = (tape->pipeline_head -
- tape->controlled_previous_pipeline_head) * 32 *
- HZ / (jiffies - tape->controlled_previous_head_time);
-
- if (tape->nr_pending_stages < tape->max_stages/*- 1 */) {
- /* -1 for read mode error recovery */
- if (time_after(jiffies, tape->uncontrolled_previous_head_time +
- 10 * HZ)) {
- tape->uncontrolled_pipeline_head_time = jiffies;
- tape->uncontrolled_pipeline_head_speed =
- (tape->pipeline_head -
- tape->uncontrolled_previous_pipeline_head) *
- 32 * HZ / (jiffies -
- tape->uncontrolled_previous_head_time);
- }
- } else {
- tape->uncontrolled_previous_head_time = jiffies;
- tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
- if (time_after(jiffies, tape->uncontrolled_pipeline_head_time +
- 30 * HZ))
- tape->uncontrolled_pipeline_head_time = jiffies;
-
- }
- tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed,
- tape->controlled_pipeline_head_speed);
-
- if (tape->speed_control == 1) {
- if (tape->nr_pending_stages >= tape->max_stages / 2)
- tape->max_insert_speed = tape->pipeline_head_speed +
- (1100 - tape->pipeline_head_speed) * 2 *
- (tape->nr_pending_stages - tape->max_stages / 2)
- / tape->max_stages;
- else
- tape->max_insert_speed = 500 +
- (tape->pipeline_head_speed - 500) * 2 *
- tape->nr_pending_stages / tape->max_stages;
-
- if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
- tape->max_insert_speed = 5000;
- } else
- tape->max_insert_speed = tape->speed_control;
-
- tape->max_insert_speed = max(tape->max_insert_speed, 500);
-}
-