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drm/i915: Split pipe+output CSC programming to noarm+arm pair

Browse source 
Move most of the pipe+output CSC programming to the
.color_commit_noarm() hook which runs before vblank evasion.
Only PIPE_CSC_MODE (the arming register) needs to remain in
inside the critical section.

A test case that just updates the CTM in a loop produces
the following i915_update_info numbers on ilk (w/o lockdep):
old                                 new
Updates: 10012			    Updates: 10008
       |			    	   |
   1us |**			       1us |**********
       |*************		    	   |*************
   4us |*********		       4us |*
       |*			    	   |**
  16us |			      16us |
       |			    	   |
  66us |			      66us |
       |			    	   |
 262us |			     262us |
       |			    	   |
   1ms |			       1ms |
       |			    	   |
   4ms |			       4ms |
       |			    	   |
  17ms |			      17ms |
       |			    	   |
Min update: 1345ns		    Min update: 1268ns
Max update: 16672ns		    Max update: 15656ns
Average update: 3914ns		    Average update: 2185ns
Overruns > 100us: 0		    Overruns > 100us: 0

And here is tgl (forced to update both pipe CSC and
output CSC, and with lockdep enabled):
old                                 new
Updates: 10012			    Updates: 10012
       |			    	   |
   1us |			       1us |
       |			    	   |
   4us |*			       4us |**
       |**			    	   |**********
  16us |*************		      16us |*************
       |*			    	   |
  66us |			      66us |
       |			    	   |
 262us |			     262us |
       |			    	   |
   1ms |			       1ms |
       |			    	   |
   4ms |			       4ms |
       |			    	   |
  17ms |			      17ms |
       |			    	   |
Min update: 5204ns		    Min update: 5176ns
Max update: 176038ns		    Max update: 186685ns
Average update: 23931ns		    Average update: 16654ns
Overruns > 250us: 0		    Overruns > 250us: 0

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220224165103.15682-5-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
This commit is contained in:
Ville Syrjälä 2022-02-24 18:51:03 +02:00
parent e9b14658d5
commit d13dde4495
1 changed files with 23 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

36
drivers/gpu/drm/i915/display/intel_color.c
View file

@ -346,15 +346,11 @@ static void ilk_load_csc_matrix(const struct intel_crtc_state *crtc_state)
ilk_csc_coeff_identity,
ilk_csc_off_zero);
}
intel_de_write_fw(dev_priv, PIPE_CSC_MODE(crtc->pipe),
crtc_state->csc_mode);
}
static void icl_load_csc_matrix(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
if (crtc_state->hw.ctm) {
u16 coeff[9];
@ -373,9 +369,6 @@ static void icl_load_csc_matrix(const struct intel_crtc_state *crtc_state)
ilk_csc_coeff_limited_range,
ilk_csc_postoff_limited_range);
}
intel_de_write_fw(dev_priv, PIPE_CSC_MODE(crtc->pipe),
crtc_state->csc_mode);
}
static void chv_load_cgm_csc(struct intel_crtc *crtc,
@ -500,6 +493,16 @@ static void icl_lut_multi_seg_pack(struct drm_color_lut *entry, u32 ldw, u32 udw
REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_LDW_MASK, ldw);
}
static void icl_color_commit_noarm(const struct intel_crtc_state *crtc_state)
{
icl_load_csc_matrix(crtc_state);
}
static void ilk_color_commit_noarm(const struct intel_crtc_state *crtc_state)
{
ilk_load_csc_matrix(crtc_state);
}
static void i9xx_color_commit_arm(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@ -525,7 +528,8 @@ static void ilk_color_commit_arm(const struct intel_crtc_state *crtc_state)
val |= PIPECONF_GAMMA_MODE(crtc_state->gamma_mode);
intel_de_write(dev_priv, PIPECONF(pipe), val);
ilk_load_csc_matrix(crtc_state);
intel_de_write_fw(dev_priv, PIPE_CSC_MODE(pipe),
crtc_state->csc_mode);
}
static void hsw_color_commit_arm(const struct intel_crtc_state *crtc_state)
@ -536,7 +540,8 @@ static void hsw_color_commit_arm(const struct intel_crtc_state *crtc_state)
intel_de_write(dev_priv, GAMMA_MODE(crtc->pipe),
crtc_state->gamma_mode);
ilk_load_csc_matrix(crtc_state);
intel_de_write_fw(dev_priv, PIPE_CSC_MODE(crtc->pipe),
crtc_state->csc_mode);
}
static void skl_color_commit_arm(const struct intel_crtc_state *crtc_state)
@ -560,10 +565,8 @@ static void skl_color_commit_arm(const struct intel_crtc_state *crtc_state)
intel_de_write(dev_priv, GAMMA_MODE(crtc->pipe),
crtc_state->gamma_mode);
if (DISPLAY_VER(dev_priv) >= 11)
icl_load_csc_matrix(crtc_state);
else
ilk_load_csc_matrix(crtc_state);
intel_de_write_fw(dev_priv, PIPE_CSC_MODE(crtc->pipe),
crtc_state->csc_mode);
}
static void i9xx_load_lut_8(struct intel_crtc *crtc,
@ -2170,6 +2173,7 @@ static const struct intel_color_funcs i9xx_color_funcs = {
static const struct intel_color_funcs icl_color_funcs = {
.color_check = icl_color_check,
.color_commit_noarm = icl_color_commit_noarm,
.color_commit_arm = skl_color_commit_arm,
.load_luts = icl_load_luts,
.read_luts = icl_read_luts,
@ -2177,6 +2181,7 @@ static const struct intel_color_funcs icl_color_funcs = {
static const struct intel_color_funcs glk_color_funcs = {
.color_check = glk_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = skl_color_commit_arm,
.load_luts = glk_load_luts,
.read_luts = glk_read_luts,
@ -2184,6 +2189,7 @@ static const struct intel_color_funcs glk_color_funcs = {
static const struct intel_color_funcs skl_color_funcs = {
.color_check = ivb_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = skl_color_commit_arm,
.load_luts = bdw_load_luts,
.read_luts = NULL,
@ -2191,6 +2197,7 @@ static const struct intel_color_funcs skl_color_funcs = {
static const struct intel_color_funcs bdw_color_funcs = {
.color_check = ivb_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = hsw_color_commit_arm,
.load_luts = bdw_load_luts,
.read_luts = NULL,
@ -2198,6 +2205,7 @@ static const struct intel_color_funcs bdw_color_funcs = {
static const struct intel_color_funcs hsw_color_funcs = {
.color_check = ivb_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = hsw_color_commit_arm,
.load_luts = ivb_load_luts,
.read_luts = NULL,
@ -2205,6 +2213,7 @@ static const struct intel_color_funcs hsw_color_funcs = {
static const struct intel_color_funcs ivb_color_funcs = {
.color_check = ivb_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = ilk_color_commit_arm,
.load_luts = ivb_load_luts,
.read_luts = NULL,
@ -2212,6 +2221,7 @@ static const struct intel_color_funcs ivb_color_funcs = {
static const struct intel_color_funcs ilk_color_funcs = {
.color_check = ilk_color_check,
.color_commit_noarm = ilk_color_commit_noarm,
.color_commit_arm = ilk_color_commit_arm,
.load_luts = ilk_load_luts,
.read_luts = ilk_read_luts,