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drm/amd/display: Fix minor issues in BW Allocation Phase2
[ Upstream commit aa5dc05340 ]
[Why]
Fix minor issues in BW Allocation Phase2.
[How]
- In set_usb4_req_bw_req(), link->dpia_bw_alloc_config.response_ready
flag should be reset before writing DPCD REQUEST_BW.
- Fix the granularity for value of 2 in get_bw_granularity().
- Removed bandwidth allocation support display fw boot option as
the fw would read feature enable status from bios.
- Clean up DPIA_EST_BW_CHANGED and DPIA_BW_REQ_SUCCESS cases in
dpia_handle_bw_alloc_response().
- Removed allocate_usb4_bw and deallocate_usb4_bw.
- Optimized loop in get_lowest_dpia_index().
- Updated link_dp_dpia_allocate_usb4_bandwidth_for_stream() and
set_usb4_req_bw_req() to always issue request bw.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: PeiChen Huang <peichen.huang@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Meenakshikumar Somasundaram
Greg Kroah-Hartman
parent
0a8fc4e007
commit
cef7f96a0a
@ -50,6 +50,7 @@ static bool get_bw_alloc_proceed_flag(struct dc_link *tmp)
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&& tmp->hpd_status
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&& tmp->dpia_bw_alloc_config.bw_alloc_enabled);
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}
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static void reset_bw_alloc_struct(struct dc_link *link)
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{
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link->dpia_bw_alloc_config.bw_alloc_enabled = false;
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@ -59,6 +60,11 @@ static void reset_bw_alloc_struct(struct dc_link *link)
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link->dpia_bw_alloc_config.bw_granularity = 0;
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link->dpia_bw_alloc_config.response_ready = false;
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}
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#define BW_GRANULARITY_0 4 // 0.25 Gbps
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#define BW_GRANULARITY_1 2 // 0.5 Gbps
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#define BW_GRANULARITY_2 1 // 1 Gbps
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static uint8_t get_bw_granularity(struct dc_link *link)
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{
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uint8_t bw_granularity = 0;
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@ -71,16 +77,20 @@ static uint8_t get_bw_granularity(struct dc_link *link)
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switch (bw_granularity & 0x3) {
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case 0:
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bw_granularity = 4;
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bw_granularity = BW_GRANULARITY_0;
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break;
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case 1:
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bw_granularity = BW_GRANULARITY_1;
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break;
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case 2:
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default:
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bw_granularity = 2;
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bw_granularity = BW_GRANULARITY_2;
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break;
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}
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return bw_granularity;
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}
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static int get_estimated_bw(struct dc_link *link)
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{
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uint8_t bw_estimated_bw = 0;
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@ -93,31 +103,7 @@ static int get_estimated_bw(struct dc_link *link)
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return bw_estimated_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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}
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static bool allocate_usb4_bw(int *stream_allocated_bw, int bw_needed, struct dc_link *link)
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{
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if (bw_needed > 0)
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*stream_allocated_bw += bw_needed;
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return true;
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}
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static bool deallocate_usb4_bw(int *stream_allocated_bw, int bw_to_dealloc, struct dc_link *link)
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{
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bool ret = false;
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if (*stream_allocated_bw > 0) {
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*stream_allocated_bw -= bw_to_dealloc;
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ret = true;
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} else {
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//Do nothing for now
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ret = true;
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}
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// Unplug so reset values
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if (!link->hpd_status)
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reset_bw_alloc_struct(link);
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return ret;
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}
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/*
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* Read all New BW alloc configuration ex: estimated_bw, allocated_bw,
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* granuality, Driver_ID, CM_Group, & populate the BW allocation structs
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@ -128,7 +114,12 @@ static void init_usb4_bw_struct(struct dc_link *link)
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// Init the known values
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link->dpia_bw_alloc_config.bw_granularity = get_bw_granularity(link);
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link->dpia_bw_alloc_config.estimated_bw = get_estimated_bw(link);
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DC_LOG_DEBUG("%s: bw_granularity(%d), estimated_bw(%d)\n",
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__func__, link->dpia_bw_alloc_config.bw_granularity,
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link->dpia_bw_alloc_config.estimated_bw);
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}
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static uint8_t get_lowest_dpia_index(struct dc_link *link)
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{
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const struct dc *dc_struct = link->dc;
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@ -141,12 +132,15 @@ static uint8_t get_lowest_dpia_index(struct dc_link *link)
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dc_struct->links[i]->ep_type != DISPLAY_ENDPOINT_USB4_DPIA)
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continue;
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if (idx > dc_struct->links[i]->link_index)
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if (idx > dc_struct->links[i]->link_index) {
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idx = dc_struct->links[i]->link_index;
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break;
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}
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}
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return idx;
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}
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/*
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* Get the Max Available BW or Max Estimated BW for each Host Router
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*
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@ -186,6 +180,7 @@ static int get_host_router_total_bw(struct dc_link *link, uint8_t type)
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return total_bw;
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}
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/*
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* Cleanup function for when the dpia is unplugged to reset struct
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* and perform any required clean up
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@ -194,42 +189,50 @@ static int get_host_router_total_bw(struct dc_link *link, uint8_t type)
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*
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* return: none
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*/
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static bool dpia_bw_alloc_unplug(struct dc_link *link)
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static void dpia_bw_alloc_unplug(struct dc_link *link)
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{
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if (!link)
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return true;
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return deallocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
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link->dpia_bw_alloc_config.sink_allocated_bw, link);
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if (link) {
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DC_LOG_DEBUG("%s: resetting bw alloc config for link(%d)\n",
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__func__, link->link_index);
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link->dpia_bw_alloc_config.sink_allocated_bw = 0;
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reset_bw_alloc_struct(link);
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}
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}
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static void set_usb4_req_bw_req(struct dc_link *link, int req_bw)
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{
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uint8_t requested_bw;
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uint32_t temp;
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// 1. Add check for this corner case #1
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if (req_bw > link->dpia_bw_alloc_config.estimated_bw)
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/* Error check whether request bw greater than allocated */
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if (req_bw > link->dpia_bw_alloc_config.estimated_bw) {
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DC_LOG_ERROR("%s: Request bw greater than estimated bw for link(%d)\n",
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__func__, link->link_index);
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req_bw = link->dpia_bw_alloc_config.estimated_bw;
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}
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temp = req_bw * link->dpia_bw_alloc_config.bw_granularity;
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requested_bw = temp / Kbps_TO_Gbps;
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// Always make sure to add more to account for floating points
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/* Always make sure to add more to account for floating points */
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if (temp % Kbps_TO_Gbps)
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++requested_bw;
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// 2. Add check for this corner case #2
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/* Error check whether requested and allocated are equal */
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req_bw = requested_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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if (req_bw == link->dpia_bw_alloc_config.sink_allocated_bw)
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return;
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if (req_bw == link->dpia_bw_alloc_config.sink_allocated_bw) {
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DC_LOG_ERROR("%s: Request bw equals to allocated bw for link(%d)\n",
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__func__, link->link_index);
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}
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if (core_link_write_dpcd(
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link->dpia_bw_alloc_config.response_ready = false; // Reset flag
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core_link_write_dpcd(
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link,
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REQUESTED_BW,
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&requested_bw,
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sizeof(uint8_t)) == DC_OK)
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link->dpia_bw_alloc_config.response_ready = false; // Reset flag
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sizeof(uint8_t));
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}
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/*
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* Return the response_ready flag from dc_link struct
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*
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@ -241,6 +244,7 @@ static bool get_cm_response_ready_flag(struct dc_link *link)
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{
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return link->dpia_bw_alloc_config.response_ready;
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}
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// ------------------------------------------------------------------
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// PUBLIC FUNCTIONS
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// ------------------------------------------------------------------
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@ -277,27 +281,27 @@ bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link)
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DPTX_BW_ALLOCATION_MODE_CONTROL,
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&response,
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sizeof(uint8_t)) != DC_OK) {
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DC_LOG_DEBUG("%s: **** FAILURE Enabling DPtx BW Allocation Mode Support ***\n",
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__func__);
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DC_LOG_DEBUG("%s: FAILURE Enabling DPtx BW Allocation Mode Support for link(%d)\n",
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__func__, link->link_index);
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} else {
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// SUCCESS Enabled DPtx BW Allocation Mode Support
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link->dpia_bw_alloc_config.bw_alloc_enabled = true;
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DC_LOG_DEBUG("%s: **** SUCCESS Enabling DPtx BW Allocation Mode Support ***\n",
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__func__);
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DC_LOG_DEBUG("%s: SUCCESS Enabling DPtx BW Allocation Mode Support for link(%d)\n",
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__func__, link->link_index);
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ret = true;
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init_usb4_bw_struct(link);
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link->dpia_bw_alloc_config.bw_alloc_enabled = true;
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}
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}
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out:
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return ret;
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}
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void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t result)
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{
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int bw_needed = 0;
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int estimated = 0;
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int host_router_total_estimated_bw = 0;
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if (!get_bw_alloc_proceed_flag((link)))
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return;
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@ -306,14 +310,22 @@ void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t res
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case DPIA_BW_REQ_FAILED:
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DC_LOG_DEBUG("%s: *** *** BW REQ FAILURE for DP-TX Request *** ***\n", __func__);
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/*
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* Ideally, we shouldn't run into this case as we always validate available
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* bandwidth and request within that limit
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*/
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estimated = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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// Update the new Estimated BW value updated by CM
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link->dpia_bw_alloc_config.estimated_bw =
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bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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DC_LOG_ERROR("%s: BW REQ FAILURE for DP-TX Request for link(%d)\n",
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__func__, link->link_index);
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DC_LOG_ERROR("%s: current estimated_bw(%d), new estimated_bw(%d)\n",
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__func__, link->dpia_bw_alloc_config.estimated_bw, estimated);
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/* Update the new Estimated BW value updated by CM */
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link->dpia_bw_alloc_config.estimated_bw = estimated;
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/* Allocate the previously requested bandwidth */
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set_usb4_req_bw_req(link, link->dpia_bw_alloc_config.estimated_bw);
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link->dpia_bw_alloc_config.response_ready = false;
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/*
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* If FAIL then it is either:
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@ -326,68 +338,34 @@ void dpia_handle_bw_alloc_response(struct dc_link *link, uint8_t bw, uint8_t res
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case DPIA_BW_REQ_SUCCESS:
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DC_LOG_DEBUG("%s: *** BW REQ SUCCESS for DP-TX Request ***\n", __func__);
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// 1. SUCCESS 1st time before any Pruning is done
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// 2. SUCCESS after prev. FAIL before any Pruning is done
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// 3. SUCCESS after Pruning is done but before enabling link
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bw_needed = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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// 1.
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if (!link->dpia_bw_alloc_config.sink_allocated_bw) {
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DC_LOG_DEBUG("%s: BW REQ SUCCESS for DP-TX Request for link(%d)\n",
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__func__, link->link_index);
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DC_LOG_DEBUG("%s: current allocated_bw(%d), new allocated_bw(%d)\n",
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__func__, link->dpia_bw_alloc_config.sink_allocated_bw, bw_needed);
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allocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw, bw_needed, link);
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link->dpia_bw_alloc_config.sink_verified_bw =
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link->dpia_bw_alloc_config.sink_allocated_bw;
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// SUCCESS from first attempt
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if (link->dpia_bw_alloc_config.sink_allocated_bw >
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link->dpia_bw_alloc_config.sink_max_bw)
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link->dpia_bw_alloc_config.sink_verified_bw =
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link->dpia_bw_alloc_config.sink_max_bw;
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}
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// 3.
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else if (link->dpia_bw_alloc_config.sink_allocated_bw) {
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// Find out how much do we need to de-alloc
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if (link->dpia_bw_alloc_config.sink_allocated_bw > bw_needed)
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deallocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
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link->dpia_bw_alloc_config.sink_allocated_bw - bw_needed, link);
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else
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allocate_usb4_bw(&link->dpia_bw_alloc_config.sink_allocated_bw,
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bw_needed - link->dpia_bw_alloc_config.sink_allocated_bw, link);
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}
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// 4. If this is the 2nd sink then any unused bw will be reallocated to master DPIA
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// => check if estimated_bw changed
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link->dpia_bw_alloc_config.sink_allocated_bw = bw_needed;
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link->dpia_bw_alloc_config.response_ready = true;
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break;
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case DPIA_EST_BW_CHANGED:
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DC_LOG_DEBUG("%s: *** ESTIMATED BW CHANGED for DP-TX Request ***\n", __func__);
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estimated = bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
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host_router_total_estimated_bw = get_host_router_total_bw(link, HOST_ROUTER_BW_ESTIMATED);
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// 1. If due to unplug of other sink
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if (estimated == host_router_total_estimated_bw) {
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// First update the estimated & max_bw fields
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if (link->dpia_bw_alloc_config.estimated_bw < estimated)
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DC_LOG_DEBUG("%s: ESTIMATED BW CHANGED for link(%d)\n",
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__func__, link->link_index);
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DC_LOG_DEBUG("%s: current estimated_bw(%d), new estimated_bw(%d)\n",
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__func__, link->dpia_bw_alloc_config.estimated_bw, estimated);
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link->dpia_bw_alloc_config.estimated_bw = estimated;
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}
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// 2. If due to realloc bw btw 2 dpia due to plug OR realloc unused Bw
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else {
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// We lost estimated bw usually due to plug event of other dpia
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link->dpia_bw_alloc_config.estimated_bw = estimated;
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}
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break;
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case DPIA_BW_ALLOC_CAPS_CHANGED:
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DC_LOG_DEBUG("%s: *** BW ALLOC CAPABILITY CHANGED for DP-TX Request ***\n", __func__);
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DC_LOG_ERROR("%s: BW ALLOC CAPABILITY CHANGED to Disabled for link(%d)\n",
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__func__, link->link_index);
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link->dpia_bw_alloc_config.bw_alloc_enabled = false;
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break;
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}
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@ -409,11 +387,11 @@ int dpia_handle_usb4_bandwidth_allocation_for_link(struct dc_link *link, int pea
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set_usb4_req_bw_req(link, link->dpia_bw_alloc_config.sink_max_bw);
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do {
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if (!(timeout > 0))
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if (timeout > 0)
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timeout--;
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else
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break;
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fsleep(10 * 1000);
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msleep(10);
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} while (!get_cm_response_ready_flag(link));
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if (!timeout)
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@ -428,37 +406,36 @@ int dpia_handle_usb4_bandwidth_allocation_for_link(struct dc_link *link, int pea
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out:
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return ret;
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}
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int link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int req_bw)
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bool link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int req_bw)
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{
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int ret = 0;
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bool ret = false;
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uint8_t timeout = 10;
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DC_LOG_DEBUG("%s: ENTER: link(%d), hpd_status(%d), current allocated_bw(%d), req_bw(%d)\n",
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__func__, link->link_index, link->hpd_status,
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link->dpia_bw_alloc_config.sink_allocated_bw, req_bw);
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if (!get_bw_alloc_proceed_flag(link))
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goto out;
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/*
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* Sometimes stream uses same timing parameters as the already
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* allocated max sink bw so no need to re-alloc
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*/
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if (req_bw != link->dpia_bw_alloc_config.sink_allocated_bw) {
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set_usb4_req_bw_req(link, req_bw);
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do {
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if (!(timeout > 0))
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if (timeout > 0)
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timeout--;
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else
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break;
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udelay(10 * 1000);
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msleep(10);
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} while (!get_cm_response_ready_flag(link));
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if (!timeout)
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ret = 0;// ERROR TIMEOUT waiting for response for allocating bw
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else if (link->dpia_bw_alloc_config.sink_allocated_bw > 0)
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ret = get_host_router_total_bw(link, HOST_ROUTER_BW_ALLOCATED);
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}
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if (timeout)
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ret = true;
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out:
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DC_LOG_DEBUG("%s: EXIT: timeout(%d), ret(%d)\n", __func__, timeout, ret);
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return ret;
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}
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bool dpia_validate_usb4_bw(struct dc_link **link, int *bw_needed_per_dpia, const unsigned int num_dpias)
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{
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bool ret = true;
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|
||||
@ -59,9 +59,9 @@ bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link);
|
||||
* @link: pointer to the dc_link struct instance
|
||||
* @req_bw: Bw requested by the stream
|
||||
*
|
||||
* return: allocated bw else return 0
|
||||
* return: true if allocated successfully
|
||||
*/
|
||||
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);
|
||||
|
||||
/*
|
||||
* Handle the USB4 BW Allocation related functionality here:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user