From 3aa77ee890b96f67903b891b08a537725793dc6e Mon Sep 17 00:00:00 2001 From: Ding Wang Date: Tue, 10 Jan 2017 12:47:37 -0500 Subject: [PATCH 0137/4131] drm/amd/display: Use DTO as clock on DP if not 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 Reviewed-by: Tony Cheng Acked-by: Harry Wentland Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c index da49be0..55d9665 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c @@ -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); -- 2.7.4