&& tmp->hpd_status
&& tmp->dpia_bw_alloc_config.bw_alloc_enabled);
}
+
static void reset_bw_alloc_struct(struct dc_link *link)
{
link->dpia_bw_alloc_config.bw_alloc_enabled = false;
link->dpia_bw_alloc_config.bw_granularity = 0;
link->dpia_bw_alloc_config.response_ready = false;
}
+
+#define BW_GRANULARITY_0 4 // 0.25 Gbps
+#define BW_GRANULARITY_1 2 // 0.5 Gbps
+#define BW_GRANULARITY_2 1 // 1 Gbps
+
static uint8_t get_bw_granularity(struct dc_link *link)
{
uint8_t bw_granularity = 0;
switch (bw_granularity & 0x3) {
case 0:
- bw_granularity = 4;
+ bw_granularity = BW_GRANULARITY_0;
break;
case 1:
+ bw_granularity = BW_GRANULARITY_1;
+ break;
+ case 2:
default:
- bw_granularity = 2;
+ bw_granularity = BW_GRANULARITY_2;
break;
}
return bw_granularity;
}
+
static int get_estimated_bw(struct dc_link *link)
{
uint8_t bw_estimated_bw = 0;
return bw_estimated_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
}
-static bool allocate_usb4_bw(int *stream_allocated_bw, int bw_needed, struct dc_link *link)
-{
- if (bw_needed > 0)
- *stream_allocated_bw += bw_needed;
-
- return true;
-}
-static bool deallocate_usb4_bw(int *stream_allocated_bw, int bw_to_dealloc, struct dc_link *link)
-{
- bool ret = false;
-
- if (*stream_allocated_bw > 0) {
- *stream_allocated_bw -= bw_to_dealloc;
- ret = true;
- } else {
- //Do nothing for now
- ret = true;
- }
- // Unplug so reset values
- if (!link->hpd_status)
- reset_bw_alloc_struct(link);
-
- return ret;
-}
/*
* Read all New BW alloc configuration ex: estimated_bw, allocated_bw,
* granuality, Driver_ID, CM_Group, & populate the BW allocation structs
// Init the known values
link->dpia_bw_alloc_config.bw_granularity = get_bw_granularity(link);
link->dpia_bw_alloc_config.estimated_bw = get_estimated_bw(link);
+
+ DC_LOG_DEBUG("%s: bw_granularity(%d), estimated_bw(%d)\n",
+ __func__, link->dpia_bw_alloc_config.bw_granularity,
+ link->dpia_bw_alloc_config.estimated_bw);
}
+
static uint8_t get_lowest_dpia_index(struct dc_link *link)
{
const struct dc *dc_struct = link->dc;
dc_struct->links[i]->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
continue;
- if (idx > dc_struct->links[i]->link_index)
+ if (idx > dc_struct->links[i]->link_index) {
idx = dc_struct->links[i]->link_index;
+ break;
+ }
}
return idx;
}
+
/*
* Get the Max Available BW or Max Estimated BW for each Host Router
*
return total_bw;
}
+
/*
* Cleanup function for when the dpia is unplugged to reset struct
* and perform any required clean up
*
* return: none
*/
-static bool dpia_bw_alloc_unplug(struct dc_link *link)
+static void dpia_bw_alloc_unplug(struct dc_link *link)
{
- if (!link)
- return true;
-
- return deallocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
- link->dpia_bw_alloc_config.sink_allocated_bw, link);
+ if (link) {
+ DC_LOG_DEBUG("%s: resetting bw alloc config for link(%d)\n",
+ __func__, link->link_index);
+ link->dpia_bw_alloc_config.sink_allocated_bw = 0;
+ reset_bw_alloc_struct(link);
+ }
}
+
static void set_usb4_req_bw_req(struct dc_link *link, int req_bw)
{
uint8_t requested_bw;
uint32_t temp;
- // 1. Add check for this corner case #1
- if (req_bw > link->dpia_bw_alloc_config.estimated_bw)
+ /* Error check whether request bw greater than allocated */
+ if (req_bw > link->dpia_bw_alloc_config.estimated_bw) {
+ DC_LOG_ERROR("%s: Request bw greater than estimated bw for link(%d)\n",
+ __func__, link->link_index);
req_bw = link->dpia_bw_alloc_config.estimated_bw;
+ }
temp = req_bw * link->dpia_bw_alloc_config.bw_granularity;
requested_bw = temp / Kbps_TO_Gbps;
- // Always make sure to add more to account for floating points
+ /* Always make sure to add more to account for floating points */
if (temp % Kbps_TO_Gbps)
++requested_bw;
- // 2. Add check for this corner case #2
+ /* Error check whether requested and allocated are equal */
req_bw = requested_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
- if (req_bw == link->dpia_bw_alloc_config.sink_allocated_bw)
- return;
+ if (req_bw == link->dpia_bw_alloc_config.sink_allocated_bw) {
+ DC_LOG_ERROR("%s: Request bw equals to allocated bw for link(%d)\n",
+ __func__, link->link_index);
+ }
- if (core_link_write_dpcd(
+ link->dpia_bw_alloc_config.response_ready = false; // Reset flag
+ core_link_write_dpcd(
link,
REQUESTED_BW,
&requested_bw,
- sizeof(uint8_t)) == DC_OK)
- link->dpia_bw_alloc_config.response_ready = false; // Reset flag
+ sizeof(uint8_t));
}
+
/*
* Return the response_ready flag from dc_link struct
*
{
return link->dpia_bw_alloc_config.response_ready;
}
+
// ------------------------------------------------------------------
// PUBLIC FUNCTIONS
// ------------------------------------------------------------------
DPTX_BW_ALLOCATION_MODE_CONTROL,
&response,
sizeof(uint8_t)) != DC_OK) {
- DC_LOG_DEBUG("%s: **** FAILURE Enabling DPtx BW Allocation Mode Support ***\n",
- __func__);
+ DC_LOG_DEBUG("%s: FAILURE Enabling DPtx BW Allocation Mode Support for link(%d)\n",
+ __func__, link->link_index);
} else {
// SUCCESS Enabled DPtx BW Allocation Mode Support
- link->dpia_bw_alloc_config.bw_alloc_enabled = true;
- DC_LOG_DEBUG("%s: **** SUCCESS Enabling DPtx BW Allocation Mode Support ***\n",
- __func__);
+ DC_LOG_DEBUG("%s: SUCCESS Enabling DPtx BW Allocation Mode Support for link(%d)\n",
+ __func__, link->link_index);
ret = true;
init_usb4_bw_struct(link);
+ link->dpia_bw_alloc_config.bw_alloc_enabled = true;
}
}
out:
return ret;
}
+
void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t result)
{
int bw_needed = 0;
int estimated = 0;
- int host_router_total_estimated_bw = 0;
if (!get_bw_alloc_proceed_flag((link)))
return;
case DPIA_BW_REQ_FAILED:
- DC_LOG_DEBUG("%s: *** *** BW REQ FAILURE for DP-TX Request *** ***\n", __func__);
+ /*
+ * Ideally, we shouldn't run into this case as we always validate available
+ * bandwidth and request within that limit
+ */
+ estimated = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
- // Update the new Estimated BW value updated by CM
- link->dpia_bw_alloc_config.estimated_bw =
- bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
+ DC_LOG_ERROR("%s: BW REQ FAILURE for DP-TX Request for link(%d)\n",
+ __func__, link->link_index);
+ DC_LOG_ERROR("%s: current estimated_bw(%d), new estimated_bw(%d)\n",
+ __func__, link->dpia_bw_alloc_config.estimated_bw, estimated);
+ /* Update the new Estimated BW value updated by CM */
+ link->dpia_bw_alloc_config.estimated_bw = estimated;
+
+ /* Allocate the previously requested bandwidth */
set_usb4_req_bw_req(link, link->dpia_bw_alloc_config.estimated_bw);
- link->dpia_bw_alloc_config.response_ready = false;
/*
* If FAIL then it is either:
case DPIA_BW_REQ_SUCCESS:
- DC_LOG_DEBUG("%s: *** BW REQ SUCCESS for DP-TX Request ***\n", __func__);
-
- // 1. SUCCESS 1st time before any Pruning is done
- // 2. SUCCESS after prev. FAIL before any Pruning is done
- // 3. SUCCESS after Pruning is done but before enabling link
-
bw_needed = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
- // 1.
- if (!link->dpia_bw_alloc_config.sink_allocated_bw) {
-
- allocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw, bw_needed, link);
- link->dpia_bw_alloc_config.sink_verified_bw =
- link->dpia_bw_alloc_config.sink_allocated_bw;
+ DC_LOG_DEBUG("%s: BW REQ SUCCESS for DP-TX Request for link(%d)\n",
+ __func__, link->link_index);
+ DC_LOG_DEBUG("%s: current allocated_bw(%d), new allocated_bw(%d)\n",
+ __func__, link->dpia_bw_alloc_config.sink_allocated_bw, bw_needed);
- // SUCCESS from first attempt
- if (link->dpia_bw_alloc_config.sink_allocated_bw >
- link->dpia_bw_alloc_config.sink_max_bw)
- link->dpia_bw_alloc_config.sink_verified_bw =
- link->dpia_bw_alloc_config.sink_max_bw;
- }
- // 3.
- else if (link->dpia_bw_alloc_config.sink_allocated_bw) {
-
- // Find out how much do we need to de-alloc
- if (link->dpia_bw_alloc_config.sink_allocated_bw > bw_needed)
- deallocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
- link->dpia_bw_alloc_config.sink_allocated_bw - bw_needed, link);
- else
- allocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
- bw_needed - link->dpia_bw_alloc_config.sink_allocated_bw, link);
- }
-
- // 4. If this is the 2nd sink then any unused bw will be reallocated to master DPIA
- // => check if estimated_bw changed
+ link->dpia_bw_alloc_config.sink_allocated_bw = bw_needed;
link->dpia_bw_alloc_config.response_ready = true;
break;
case DPIA_EST_BW_CHANGED:
- DC_LOG_DEBUG("%s: *** ESTIMATED BW CHANGED for DP-TX Request ***\n", __func__);
-
estimated = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
- host_router_total_estimated_bw = get_host_router_total_bw(link, HOST_ROUTER_BW_ESTIMATED);
- // 1. If due to unplug of other sink
- if (estimated == host_router_total_estimated_bw) {
- // First update the estimated & max_bw fields
- if (link->dpia_bw_alloc_config.estimated_bw < estimated)
- link->dpia_bw_alloc_config.estimated_bw = estimated;
- }
- // 2. If due to realloc bw btw 2 dpia due to plug OR realloc unused Bw
- else {
- // We lost estimated bw usually due to plug event of other dpia
- link->dpia_bw_alloc_config.estimated_bw = estimated;
- }
+ DC_LOG_DEBUG("%s: ESTIMATED BW CHANGED for link(%d)\n",
+ __func__, link->link_index);
+ DC_LOG_DEBUG("%s: current estimated_bw(%d), new estimated_bw(%d)\n",
+ __func__, link->dpia_bw_alloc_config.estimated_bw, estimated);
+
+ link->dpia_bw_alloc_config.estimated_bw = estimated;
break;
case DPIA_BW_ALLOC_CAPS_CHANGED:
- DC_LOG_DEBUG("%s: *** BW ALLOC CAPABILITY CHANGED for DP-TX Request ***\n", __func__);
+ DC_LOG_ERROR("%s: BW ALLOC CAPABILITY CHANGED to Disabled for link(%d)\n",
+ __func__, link->link_index);
link->dpia_bw_alloc_config.bw_alloc_enabled = false;
break;
}
set_usb4_req_bw_req(link, link->dpia_bw_alloc_config.sink_max_bw);
do {
- if (!(timeout > 0))
+ if (timeout > 0)
timeout--;
else
break;
- fsleep(10 * 1000);
+ drm_msleep(10);
} while (!get_cm_response_ready_flag(link));
if (!timeout)
out:
return ret;
}
-int link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int req_bw)
+
+bool link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int req_bw)
{
- int ret = 0;
+ bool ret = false;
uint8_t timeout = 10;
+ DC_LOG_DEBUG("%s: ENTER: link(%d), hpd_status(%d), current allocated_bw(%d), req_bw(%d)\n",
+ __func__, link->link_index, link->hpd_status,
+ link->dpia_bw_alloc_config.sink_allocated_bw, req_bw);
+
if (!get_bw_alloc_proceed_flag(link))
goto out;
- /*
- * Sometimes stream uses same timing parameters as the already
- * allocated max sink bw so no need to re-alloc
- */
- if (req_bw != link->dpia_bw_alloc_config.sink_allocated_bw) {
- set_usb4_req_bw_req(link, req_bw);
- do {
- if (!(timeout > 0))
- timeout--;
- else
- break;
- udelay(10 * 1000);
- } while (!get_cm_response_ready_flag(link));
+ set_usb4_req_bw_req(link, req_bw);
+ do {
+ if (timeout > 0)
+ timeout--;
+ else
+ break;
+ drm_msleep(10);
+ } while (!get_cm_response_ready_flag(link));
- if (!timeout)
- ret = 0;// ERROR TIMEOUT waiting for response for allocating bw
- else if (link->dpia_bw_alloc_config.sink_allocated_bw > 0)
- ret = get_host_router_total_bw(link, HOST_ROUTER_BW_ALLOCATED);
- }
+ if (timeout)
+ ret = true;
out:
+ DC_LOG_DEBUG("%s: EXIT: timeout(%d), ret(%d)\n", __func__, timeout, ret);
return ret;
}
+
bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, const unsigned int num_dpias)
{
bool ret = true;
projects / openbsd / commitdiff