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| author | Chiawen Huang <chiawen.huang@amd.com> | 2018-09-05 20:34:57 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-09-14 15:47:56 -0500 |
| commit | 16f4c69549ef676bc278be8b267a811b6f8f59ad (patch) | |
| tree | e5f8aaab544f2b3fae8b509d7286199ddfeb68b8 /drivers/gpu/drm/amd/display | |
| parent | cac7643a27ff15a3be2bf375fe7abd4cced228c3 (diff) | |
| download | linux-16f4c69549ef676bc278be8b267a811b6f8f59ad.tar.gz linux-16f4c69549ef676bc278be8b267a811b6f8f59ad.tar.bz2 linux-16f4c69549ef676bc278be8b267a811b6f8f59ad.zip | |
drm/amd/display: add query HPD interface.
[Why]
current dc_link_detect function is not only detection but also update some link data.
[How]
added a pure get HPD state function.
Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 18 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_link.h | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 9d8dc2c1ca65..bd58dbae7d3e 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -890,6 +890,24 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) return true; } +bool dc_link_get_hpd_state(struct dc_link *dc_link) +{ + struct gpio *hpd_pin; + uint32_t state; + + hpd_pin = get_hpd_gpio(dc_link->ctx->dc_bios, + dc_link->link_id, dc_link->ctx->gpio_service); + if (hpd_pin == NULL) + ASSERT(false); + + dal_gpio_open(hpd_pin, GPIO_MODE_INTERRUPT); + dal_gpio_get_value(hpd_pin, &state); + dal_gpio_close(hpd_pin); + dal_gpio_destroy_irq(&hpd_pin); + + return state; +} + static enum hpd_source_id get_hpd_line( struct dc_link *link) { diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index d43cefbc43d3..438fb35d87b8 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -167,6 +167,7 @@ enum dc_detect_reason { }; bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason); +bool dc_link_get_hpd_state(struct dc_link *dc_link); /* Notify DC about DP RX Interrupt (aka Short Pulse Interrupt). * Return: |