1 files changed, 46 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0801-drm-amd-display-calculate-stream-phy_pix_clk-before-.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0801-drm-amd-display-calculate-stream-phy_pix_clk-before-.patch
new file mode 100644
index 00000000..8288565a
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0801-drm-amd-display-calculate-stream-phy_pix_clk-before-.patch
@@ -0,0 +1,46 @@
+From b058bf7df5f59ed785e812cc1724927e35a0f026 Mon Sep 17 00:00:00 2001
+From: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com>
+Date: Sat, 20 Oct 2018 01:21:40 +0530
+Subject: [PATCH 0801/2940] drm/amd/display: calculate stream->phy_pix_clk
+ before clock mapping
+
+[why]
+phy_pix_clk is one of the variable used to check if one PLL can be shared
+with displays having common mode set configuration. As of now
+phy_pix_clock varialbe is calculated in function dc_validate_stream().
+dc_validate_stream() function is called after clocks are assigned for the
+new display. Due to this during hotplug, when PLL sharing conditions are
+checked for new display phy_pix_clk variable will be 0 and for displays
+that are already enabled phy_pix_clk will have some value. Hence PLL will
+not be shared and if the display hardware doesn't have any more PLL to
+assign, mode set will fail due to resource unavailability.
+
+[how]
+Instead of only calculating the phy_pix_clk variable after the PLL is
+assigned for new display, this patch calculates phy_pix_clk also during
+the before assigning the PLL for new display.
+
+Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@amd.com>
+Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
+Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+---
+ drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+index a7c950ad95b6..fcb29ca6f0e8 100644
+--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
++++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+@@ -1976,6 +1976,8 @@ enum dc_status resource_map_pool_resources(
+ 		}
+ 	*/
+ 
++	calculate_phy_pix_clks(stream);
++
+ 	/* acquire new resources */
+ 	pipe_idx = acquire_first_free_pipe(&context->res_ctx, pool, stream);
+ 
+-- 
+2.17.1
+