[PATCH 1/7] drm/i915/dp: Update Comment for Valid DSC Slices per Line

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

For some platforms, the maximum slices per DSC engine is 4, while for
others it is 2. Update the comment to reflect this and clarify that
the 'valid_dsc_slicecount' list represents the valid number of slices
per pipe.

Currently, we are working with 1, and 2 slices per DSC engine,
which works for all platforms. With this the number of slices per pipe
can be 1,2 or 4 with different slice & DSC engine configuration.

Add a #TODO for adding support for 4 slices per DSC engine where
supported.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 7e29619ba040..bd9f37e1a13f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -109,8 +109,14 @@
 /* Constants for DP DSC configurations */
 static const u8 valid_dsc_bpp[] = {6, 8, 10, 12, 15};
 
-/* With Single pipe configuration, HW is capable of supporting maximum
- * of 4 slices per line.
+/*
+ * With Single pipe configuration, HW is capable of supporting maximum of:
+ * 2 slices per line for ICL, BMG
+ * 4 slices per line for other platforms.
+ * For now consider a max of 2 slices per line, which works for all platforms.
+ * With this we can have max of 4 DSC Slices per pipe.
+ *
+ * #TODO Split this better to use 4 slices/dsc engine where supported.
  */
 static const u8 valid_dsc_slicecount[] = {1, 2, 4};
 
-- 
2.45.2