diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.14.71/0137-drm-amd-display-Use-DTO-as-clock-on-DP-if-not.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.14.71/0137-drm-amd-display-Use-DTO-as-clock-on-DP-if-not.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.14.71/0137-drm-amd-display-Use-DTO-as-clock-on-DP-if-not.patch b/common/recipes-kernel/linux/linux-yocto-4.14.71/0137-drm-amd-display-Use-DTO-as-clock-on-DP-if-not.patch new file mode 100644 index 00000000..8accad70 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.14.71/0137-drm-amd-display-Use-DTO-as-clock-on-DP-if-not.patch @@ -0,0 +1,57 @@ +From 3aa77ee890b96f67903b891b08a537725793dc6e Mon Sep 17 00:00:00 2001 +From: Ding Wang <Ding.Wang@amd.com> +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 <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> +--- + 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 + |