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drm/amd/display: Move LTTPR cap read into its own function

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[WHY]
We want LTTPR capabilities to be readable from more places than just
retrieve_link_cap

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wesley Chalmers
2021-05-14 15:06:30 -04:00
committed by Alex Deucher
parent 0abda67419
commit ee9b1992f1
1 changed files with 41 additions and 34 deletions
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75
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@@ -3619,47 +3619,16 @@ static bool dpcd_read_sink_ext_caps(struct dc_link *link)
return true;
}
static bool retrieve_link_cap(struct dc_link *link)
bool dp_retrieve_lttpr_cap(struct dc_link *link)
{
/* DP_ADAPTER_CAP - DP_DPCD_REV + 1 == 16 and also DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT + 1 == 16,
* which means size 16 will be good for both of those DPCD register block reads
*/
uint8_t dpcd_data[16];
uint8_t lttpr_dpcd_data[6];
/*Only need to read 1 byte starting from DP_DPRX_FEATURE_ENUMERATION_LIST.
*/
uint8_t dpcd_dprx_data = '\0';
uint8_t dpcd_power_state = '\0';
struct dp_device_vendor_id sink_id;
union down_stream_port_count down_strm_port_count;
union edp_configuration_cap edp_config_cap;
union dp_downstream_port_present ds_port = { 0 };
enum dc_status status = DC_ERROR_UNEXPECTED;
uint32_t read_dpcd_retry_cnt = 3;
int i;
struct dp_sink_hw_fw_revision dp_hw_fw_revision;
bool is_lttpr_present = false;
const uint32_t post_oui_delay = 30; // 30ms
bool vbios_lttpr_enable = false;
bool vbios_lttpr_interop = false;
struct dc_bios *bios = link->dc->ctx->dc_bios;
enum dc_status status = DC_ERROR_UNEXPECTED;
bool is_lttpr_present = false;
memset(dpcd_data, '\0', sizeof(dpcd_data));
memset(lttpr_dpcd_data, '\0', sizeof(lttpr_dpcd_data));
memset(&down_strm_port_count,
'\0', sizeof(union down_stream_port_count));
memset(&edp_config_cap, '\0',
sizeof(union edp_configuration_cap));
/* if extended timeout is supported in hardware,
* default to LTTPR timeout (3.2ms) first as a W/A for DP link layer
* CTS 4.2.1.1 regression introduced by CTS specs requirement update.
*/
dc_link_aux_try_to_configure_timeout(link->ddc,
LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
/* Query BIOS to determine if LTTPR functionality is forced on by system */
if (bios->funcs->get_lttpr_caps) {
enum bp_result bp_query_result;
@@ -3741,7 +3710,45 @@ static bool retrieve_link_cap(struct dc_link *link)
else
link->lttpr_mode = LTTPR_MODE_NON_LTTPR;
}
return is_lttpr_present;
}
static bool retrieve_link_cap(struct dc_link *link)
{
/* DP_ADAPTER_CAP - DP_DPCD_REV + 1 == 16 and also DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT + 1 == 16,
* which means size 16 will be good for both of those DPCD register block reads
*/
uint8_t dpcd_data[16];
/*Only need to read 1 byte starting from DP_DPRX_FEATURE_ENUMERATION_LIST.
*/
uint8_t dpcd_dprx_data = '\0';
uint8_t dpcd_power_state = '\0';
struct dp_device_vendor_id sink_id;
union down_stream_port_count down_strm_port_count;
union edp_configuration_cap edp_config_cap;
union dp_downstream_port_present ds_port = { 0 };
enum dc_status status = DC_ERROR_UNEXPECTED;
uint32_t read_dpcd_retry_cnt = 3;
int i;
struct dp_sink_hw_fw_revision dp_hw_fw_revision;
const uint32_t post_oui_delay = 30; // 30ms
bool is_lttpr_present = false;
memset(dpcd_data, '\0', sizeof(dpcd_data));
memset(&down_strm_port_count,
'\0', sizeof(union down_stream_port_count));
memset(&edp_config_cap, '\0',
sizeof(union edp_configuration_cap));
/* if extended timeout is supported in hardware,
* default to LTTPR timeout (3.2ms) first as a W/A for DP link layer
* CTS 4.2.1.1 regression introduced by CTS specs requirement update.
*/
dc_link_aux_try_to_configure_timeout(link->ddc,
LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
is_lttpr_present = dp_retrieve_lttpr_cap(link);
if (!is_lttpr_present)
dc_link_aux_try_to_configure_timeout(link->ddc, LINK_AUX_DEFAULT_TIMEOUT_PERIOD);