diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2087-drm-amd-display-set-link-dongle_max_pix_clk-to-0-on-.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2087-drm-amd-display-set-link-dongle_max_pix_clk-to-0-on-.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2087-drm-amd-display-set-link-dongle_max_pix_clk-to-0-on-.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2087-drm-amd-display-set-link-dongle_max_pix_clk-to-0-on-.patch new file mode 100644 index 00000000..ca73ff01 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2087-drm-amd-display-set-link-dongle_max_pix_clk-to-0-on-.patch @@ -0,0 +1,45 @@ +From 947b1dd029a2331e410db6deba4bf5939f3a27e7 Mon Sep 17 00:00:00 2001 +From: Samson Tam <Samson.Tam@amd.com> +Date: Tue, 28 May 2019 14:44:40 -0400 +Subject: [PATCH 2087/2940] drm/amd/display: set link->dongle_max_pix_clk to 0 + on a disconnect + +[Why] +Found issue in EDID Emulation where if we connect a display using + a passive HDMI-DP dongle, disconnect it and then try to emulate + a display using DP, we could not see 4K modes. This was because + on a disconnect, dongle_max_pix_clk was still set so when we + emulate using DP, in dc_link_validate_mode_timing(), it would + think we were still using a dongle and limit the modes we support. + +[How] +In dc_link_detect(), set dongle_max_pix_clk to 0 when we detect + a hotplug out ( if new_connection_type = dc_connection_none ). + +Signed-off-by: Samson Tam <Samson.Tam@amd.com> +Reviewed-by: Jun Lei <Jun.Lei@amd.com> +Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> +--- + drivers/gpu/drm/amd/display/dc/core/dc_link.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +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 78ac91176686..8a51ef30d7b1 100644 +--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c ++++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c +@@ -962,6 +962,12 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) + + link->type = dc_connection_none; + sink_caps.signal = SIGNAL_TYPE_NONE; ++ /* When we unplug a passive DP-HDMI dongle connection, dongle_max_pix_clk ++ * is not cleared. If we emulate a DP signal on this connection, it thinks ++ * the dongle is still there and limits the number of modes we can emulate. ++ * Clear dongle_max_pix_clk on disconnect to fix this ++ */ ++ link->dongle_max_pix_clk = 0; + } + + LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p dpcd same=%d edid same=%d\n", +-- +2.17.1 + |