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drm/amd/display: Document pipe split policy

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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@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira 2022-04-01 14:46:07 -04:00 • committed by Alex Deucher
parent c620e79bb6
commit ea76895ffa
1 changed files with 35 additions and 0 deletions
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35
drivers/gpu/drm/amd/display/dc/dc.h
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@ -386,9 +386,31 @@ enum dcc_option {
DCC_HALF_REQ_DISALBE = 2, 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 { 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 = 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_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, MPC_SPLIT_AVOID_MULT_DISP = 2,
}; };
@ -623,6 +645,14 @@ struct dc_state;
struct resource_pool; struct resource_pool;
struct dce_hwseq; 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 { struct dc_debug_options {
bool native422_support; bool native422_support;
bool disable_dsc; bool disable_dsc;
@ -642,6 +672,11 @@ struct dc_debug_options {
bool disable_stutter; bool disable_stutter;
bool use_max_lb; bool use_max_lb;
enum dcc_option disable_dcc; 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; enum pipe_split_policy pipe_split_policy;
bool force_single_disp_pipe_split; bool force_single_disp_pipe_split;
bool voltage_align_fclk; bool voltage_align_fclk;