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drm/amd/display: Use DTO as clock on DP if not

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Use DVO as pixel clock for DP before enabling link
PHY. Otherwise, when switching from HDMI passive dongle
to DP on the same connector, the PHY PLL is used as
pixel clock, and CRTC would stop working.

Signed-off-by: Ding Wang <Ding.Wang@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ding Wang 2017-01-10 12:47:37 -05:00 • committed by Alex Deucher
parent 3e183c5f08
commit 0ea9e02af5
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
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@ -61,6 +61,31 @@ void dp_enable_link_phy(
{
struct link_encoder *link_enc = link->link_enc;
struct pipe_ctx *pipes =
link->dc->current_context->res_ctx.pipe_ctx;
struct clock_source *dp_cs =
link->dc->res_pool->dp_clock_source;
unsigned int i;
/* If the current pixel clock source is not DTO(happens after
* switching from HDMI passive dongle to DP on the same connector),
* switch the pixel clock source to DTO.
*/
for (i = 0; i < MAX_PIPES; i++) {
if (pipes[i].stream != NULL &&
pipes[i].stream->sink != NULL &&
pipes[i].stream->sink->link == link) {
if (pipes[i].clock_source->id != CLOCK_SOURCE_ID_DP_DTO) {
pipes[i].clock_source = dp_cs;
pipes[i].pix_clk_params.requested_pix_clk =
pipes[i].stream->public.timing.pix_clk_khz;
pipes[i].clock_source->funcs->program_pix_clk(
pipes[i].clock_source,
&pipes[i].pix_clk_params,
&pipes[i].pll_settings);
}
}
}
if (dc_is_dp_sst_signal(signal)) {
if (signal == SIGNAL_TYPE_EDP) {
link_enc->funcs->power_control(link_enc, true);