[PATCH 45/51] drm/gm12u320: Simplify upload work
Daniel Vetter
daniel.vetter at ffwll.ch
Thu Feb 27 18:15:16 UTC 2020
Instead of having a work item that never stops (which really should be
a kthread), with a dedicated workqueue to not upset anyone else, use a
delayed work. A bunch of changes:
- We can throw out all the custom wakeup and requeue logic and state
tracking. If we schedule the work with a 0 delay it'll get
scheduled immediately.
- Persistent state (frame & draw_status_timeout) need to be moved out
of the work.
- diff is bigger than the changes, biggest chunk is reindenting the
work fn because it lost its while loop.
Lots of code deleting as consequence all over. Specifically we can
delete the drm_driver.release code now!
v2: Review from Hans:
- Use mod_delayed_work in the plane update path to make sure we do
actually schedule immediately). In the worker we still want
queue_delayed_work, which won't modify the timeout when the work is
already scheduled. Which is exactly what we want if the work races
with a plane update.
- Switch to system_long_wq, Hans says on usb2 a plane upload can take
80 ms.
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
Cc: Hans de Goede <hdegoede at redhat.com>
Cc: "Noralf Trønnes" <noralf at tronnes.org>
---
drivers/gpu/drm/tiny/gm12u320.c | 171 +++++++++++++-------------------
1 file changed, 68 insertions(+), 103 deletions(-)
diff --git a/drivers/gpu/drm/tiny/gm12u320.c b/drivers/gpu/drm/tiny/gm12u320.c
index c22b2ee470eb..bbc4ef4456e6 100644
--- a/drivers/gpu/drm/tiny/gm12u320.c
+++ b/drivers/gpu/drm/tiny/gm12u320.c
@@ -89,13 +89,12 @@ struct gm12u320_device {
unsigned char *cmd_buf;
unsigned char *data_buf[GM12U320_BLOCK_COUNT];
struct {
- bool run;
- struct workqueue_struct *workq;
- struct work_struct work;
- wait_queue_head_t waitq;
+ struct delayed_work work;
struct mutex lock;
struct drm_framebuffer *fb;
struct drm_rect rect;
+ int frame;
+ int draw_status_timeout;
} fb_update;
};
@@ -183,19 +182,9 @@ static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
data_block_footer, DATA_BLOCK_FOOTER_SIZE);
}
- gm12u320->fb_update.workq = create_singlethread_workqueue(DRIVER_NAME);
- if (!gm12u320->fb_update.workq)
- return -ENOMEM;
-
return 0;
}
-static void gm12u320_usb_free(struct gm12u320_device *gm12u320)
-{
- if (gm12u320->fb_update.workq)
- destroy_workqueue(gm12u320->fb_update.workq);
-}
-
static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
u8 req_a, u8 req_b,
u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
@@ -338,80 +327,77 @@ static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
static void gm12u320_fb_update_work(struct work_struct *work)
{
struct gm12u320_device *gm12u320 =
- container_of(work, struct gm12u320_device, fb_update.work);
- int draw_status_timeout = FIRST_FRAME_TIMEOUT;
+ container_of(to_delayed_work(work), struct gm12u320_device,
+ fb_update.work);
int block, block_size, len;
- int frame = 0;
int ret = 0;
- while (gm12u320->fb_update.run) {
- gm12u320_copy_fb_to_blocks(gm12u320);
-
- for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
- if (block == GM12U320_BLOCK_COUNT - 1)
- block_size = DATA_LAST_BLOCK_SIZE;
- else
- block_size = DATA_BLOCK_SIZE;
-
- /* Send data command to device */
- memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
- gm12u320->cmd_buf[8] = block_size & 0xff;
- gm12u320->cmd_buf[9] = block_size >> 8;
- gm12u320->cmd_buf[20] = 0xfc - block * 4;
- gm12u320->cmd_buf[21] = block | (frame << 7);
-
- ret = usb_bulk_msg(gm12u320->udev,
- usb_sndbulkpipe(gm12u320->udev, DATA_SND_EPT),
- gm12u320->cmd_buf, CMD_SIZE, &len,
- CMD_TIMEOUT);
- if (ret || len != CMD_SIZE)
- goto err;
-
- /* Send data block to device */
- ret = usb_bulk_msg(gm12u320->udev,
- usb_sndbulkpipe(gm12u320->udev, DATA_SND_EPT),
- gm12u320->data_buf[block], block_size,
- &len, DATA_TIMEOUT);
- if (ret || len != block_size)
- goto err;
-
- /* Read status */
- ret = usb_bulk_msg(gm12u320->udev,
- usb_rcvbulkpipe(gm12u320->udev, DATA_RCV_EPT),
- gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
- CMD_TIMEOUT);
- if (ret || len != READ_STATUS_SIZE)
- goto err;
- }
+ gm12u320_copy_fb_to_blocks(gm12u320);
+
+ for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
+ if (block == GM12U320_BLOCK_COUNT - 1)
+ block_size = DATA_LAST_BLOCK_SIZE;
+ else
+ block_size = DATA_BLOCK_SIZE;
+
+ /* Send data command to device */
+ memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
+ gm12u320->cmd_buf[8] = block_size & 0xff;
+ gm12u320->cmd_buf[9] = block_size >> 8;
+ gm12u320->cmd_buf[20] = 0xfc - block * 4;
+ gm12u320->cmd_buf[21] =
+ block | (gm12u320->fb_update.frame << 7);
- /* Send draw command to device */
- memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
ret = usb_bulk_msg(gm12u320->udev,
usb_sndbulkpipe(gm12u320->udev, DATA_SND_EPT),
- gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+ gm12u320->cmd_buf, CMD_SIZE, &len,
+ CMD_TIMEOUT);
if (ret || len != CMD_SIZE)
goto err;
+ /* Send data block to device */
+ ret = usb_bulk_msg(gm12u320->udev,
+ usb_sndbulkpipe(gm12u320->udev, DATA_SND_EPT),
+ gm12u320->data_buf[block], block_size,
+ &len, DATA_TIMEOUT);
+ if (ret || len != block_size)
+ goto err;
+
/* Read status */
ret = usb_bulk_msg(gm12u320->udev,
usb_rcvbulkpipe(gm12u320->udev, DATA_RCV_EPT),
gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
- draw_status_timeout);
+ CMD_TIMEOUT);
if (ret || len != READ_STATUS_SIZE)
goto err;
-
- draw_status_timeout = CMD_TIMEOUT;
- frame = !frame;
-
- /*
- * We must draw a frame every 2s otherwise the projector
- * switches back to showing its logo.
- */
- wait_event_timeout(gm12u320->fb_update.waitq,
- !gm12u320->fb_update.run ||
- gm12u320->fb_update.fb != NULL,
- IDLE_TIMEOUT);
}
+
+ /* Send draw command to device */
+ memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
+ ret = usb_bulk_msg(gm12u320->udev,
+ usb_sndbulkpipe(gm12u320->udev, DATA_SND_EPT),
+ gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
+ if (ret || len != CMD_SIZE)
+ goto err;
+
+ /* Read status */
+ ret = usb_bulk_msg(gm12u320->udev,
+ usb_rcvbulkpipe(gm12u320->udev, DATA_RCV_EPT),
+ gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
+ gm12u320->fb_update.draw_status_timeout);
+ if (ret || len != READ_STATUS_SIZE)
+ goto err;
+
+ gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
+ gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
+
+ /*
+ * We must draw a frame every 2s otherwise the projector
+ * switches back to showing its logo.
+ */
+ queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
+ IDLE_TIMEOUT);
+
return;
err:
/* Do not log errors caused by module unload or device unplug */
@@ -446,36 +432,24 @@ static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
mutex_unlock(&gm12u320->fb_update.lock);
if (wakeup)
- wake_up(&gm12u320->fb_update.waitq);
+ mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);
if (old_fb)
drm_framebuffer_put(old_fb);
}
-static void gm12u320_start_fb_update(struct gm12u320_device *gm12u320)
-{
- mutex_lock(&gm12u320->fb_update.lock);
- gm12u320->fb_update.run = true;
- mutex_unlock(&gm12u320->fb_update.lock);
-
- queue_work(gm12u320->fb_update.workq, &gm12u320->fb_update.work);
-}
-
static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
{
- mutex_lock(&gm12u320->fb_update.lock);
- gm12u320->fb_update.run = false;
- mutex_unlock(&gm12u320->fb_update.lock);
+ struct drm_framebuffer *old_fb;
- wake_up(&gm12u320->fb_update.waitq);
- cancel_work_sync(&gm12u320->fb_update.work);
+ cancel_delayed_work_sync(&gm12u320->fb_update.work);
mutex_lock(&gm12u320->fb_update.lock);
- if (gm12u320->fb_update.fb) {
- drm_framebuffer_put(gm12u320->fb_update.fb);
- gm12u320->fb_update.fb = NULL;
- }
+ old_fb = gm12u320->fb_update.fb;
+ gm12u320->fb_update.fb = NULL;
mutex_unlock(&gm12u320->fb_update.lock);
+
+ drm_framebuffer_put(old_fb);
}
static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
@@ -583,11 +557,11 @@ static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
- struct gm12u320_device *gm12u320 = pipe->crtc.dev->dev_private;
struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
+ struct gm12u320_device *gm12u320 = pipe->crtc.dev->dev_private;
+ gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
gm12u320_fb_mark_dirty(plane_state->fb, &rect);
- gm12u320_start_fb_update(gm12u320);
}
static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
@@ -622,13 +596,6 @@ static const uint64_t gm12u320_pipe_modifiers[] = {
DRM_FORMAT_MOD_INVALID
};
-static void gm12u320_driver_release(struct drm_device *dev)
-{
- struct gm12u320_device *gm12u320 = dev->dev_private;
-
- gm12u320_usb_free(gm12u320);
-}
-
DEFINE_DRM_GEM_FOPS(gm12u320_fops);
static struct drm_driver gm12u320_drm_driver = {
@@ -640,7 +607,6 @@ static struct drm_driver gm12u320_drm_driver = {
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
- .release = gm12u320_driver_release,
.fops = &gm12u320_fops,
DRM_GEM_SHMEM_DRIVER_OPS,
};
@@ -670,9 +636,8 @@ static int gm12u320_usb_probe(struct usb_interface *interface,
return -ENOMEM;
gm12u320->udev = interface_to_usbdev(interface);
- INIT_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
+ INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
mutex_init(&gm12u320->fb_update.lock);
- init_waitqueue_head(&gm12u320->fb_update.waitq);
dev = &gm12u320->dev;
ret = devm_drm_dev_init(&interface->dev, dev, &gm12u320_drm_driver);
--
2.24.1
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