From: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
In the DCN code, we can find some references to three different pipe
split policies but no clear description. This commit adds some
kernel-doc that explains more about these options and a little bit of
their impact.
Reviewed-by: Harry Wentland <Harry.Wentland@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dc.h | 35 +++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index f2accacae85b..07feb8551436 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -385,9 +385,31 @@ enum dcc_option {
DCC_HALF_REQ_DISALBE = 2,
};
+/**
+ * enum pipe_split_policy - Pipe split strategy supported by DCN
+ *
+ * This enum is used to define the pipe split policy supported by DCN. By
+ * default, DC favors MPC_SPLIT_DYNAMIC.
+ */
enum pipe_split_policy {
+ /**
+ * @MPC_SPLIT_DYNAMIC: DC will automatically decide how to split the
+ * pipe in order to bring the best trade-off between performance and
+ * power consumption. This is the recommended option.
+ */
MPC_SPLIT_DYNAMIC = 0,
+
+ /**
+ * @MPC_SPLIT_DYNAMIC: Avoid pipe split, which means that DC will not
+ * try any sort of split optimization.
+ */
MPC_SPLIT_AVOID = 1,
+
+ /**
+ * @MPC_SPLIT_DYNAMIC: With this option, DC will only try to optimize
+ * the pipe utilization when using a single display; if the user
+ * connects to a second display, DC will avoid pipe split.
+ */
MPC_SPLIT_AVOID_MULT_DISP = 2,
};
@@ -622,6 +644,14 @@ struct dc_state;
struct resource_pool;
struct dce_hwseq;
+/**
+ * struct dc_debug_options - DC debug struct
+ *
+ * This struct provides a simple mechanism for developers to change some
+ * configurations, enable/disable features, and activate extra debug options.
+ * This can be very handy to narrow down whether some specific feature is
+ * causing an issue or not.
+ */
struct dc_debug_options {
bool native422_support;
bool disable_dsc;
@@ -641,6 +671,11 @@ struct dc_debug_options {
bool disable_stutter;
bool use_max_lb;
enum dcc_option disable_dcc;
+
+ /**
+ * @pipe_split_policy: Define which pipe split policy is used by the
+ * display core.
+ */
enum pipe_split_policy pipe_split_policy;
bool force_single_disp_pipe_split;
bool voltage_align_fclk;
--
2.25.1
