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authorSimon Horman <horms+renesas@verge.net.au>2019-07-03 11:49:23 +0200
committerSimon Horman <horms+renesas@verge.net.au>2019-07-16 13:17:40 +0200
commit96720a3a6eb306481430501cb027e11c0616f9bf (patch)
tree689147f45d0d557fe4f0833bcb500ef543de1e5f /projects/linux
parent1359a385f4433b5b62ff43076b4f380684d9aa92 (diff)
projects: linux: mm: Validate max VGA dot clock
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'projects/linux')
-rw-r--r--projects/linux/mm/bsp392_validate-max-vga-dot-clock.yaml29
1 files changed, 29 insertions, 0 deletions
diff --git a/projects/linux/mm/bsp392_validate-max-vga-dot-clock.yaml b/projects/linux/mm/bsp392_validate-max-vga-dot-clock.yaml
new file mode 100644
index 0000000..7c4369a
--- /dev/null
+++ b/projects/linux/mm/bsp392_validate-max-vga-dot-clock.yaml
@@ -0,0 +1,29 @@
+title: "Validate max VGA dot clock"
+team: MM
+key: c2bfaee0-0695-4119-805a-085158941815
+status: Abandoned
+assignee: Simon
+
+relationships:
+
+bsp-commits:
+ - 6c59e13ad0dbc11c40e0120104eb2c80ecea3b52 # arm64: dts: r8a77995-draak: Set max dot clock for vga
+ - ab99897bb0960d6988ae72ce156379e7187fce2a # arm64: dts: salvator-common: Set max dot clock for vga
+ - 27aafebfab0452e2025ad480e6cbc206473c1c78 # arm64: dts: r8a77990-ebisu: Set max dot clock for vga
+ - 59c65194d7306634450c5cabe7f615e4c96a42b8 # drm/brdige: dumb-vga-dac: Add dot clock valid check
+
+comments:
+ - These patches are not suitable for upstream in their current form
+
+ The maximum dot clock frequency isn't a property of the VGA connector,
+ rather, it is a property of the DU and/or the LVDS encoders. It seems
+ most appropriate to make it a property of the DU in which case it
+ should not be specified in DT, but rather be included in the driver in
+ the crtc .mode_valid() operation.
+
+ Furthermore, the values in the BSP seem quite low and it is suggested
+ that they are validated against the hardware limits derived from the DU.
+ And as discuss the results of the investigation with the BSP team
+ as necessary.
+
+ - Above text is derived from a conversation with Laurent.