drm/i915/psr: Use calculated io and fast wake lines

[ Upstream commit 9629b0c3ba3dc54d0634e5fa855beaccbbaf9a34 ]

Currently we are using hardcoded 7 for io and fast wake lines.

According to Bspec io and fast wake times are both 42us for
DISPLAY_VER >= 12 and 50us and 32us for older platforms.

Calculate line counts for these and configure them into PSR2_CTL
accordingly

Use 45 us for the fast wake calculation as 42 seems to be too
tight based on testing.

Bspec: 49274, 4289

Cc: Mika Kahola <mika.kahola@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Fixes: 1c82d5ae0254 ("drm/i915/psr: Program default IO buffer Wake and Fast Wake")
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7725
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230221085304.3382297-1-jouni.hogander@intel.com
(cherry picked from commit 1d43cdc7e3fdd066200175fa2f13c2c08054921d)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 135dbcab62b28612d104a83308e9dafca9f96677..63b7105e818a6574cb528edccc13952afd55ccca 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1604,6 +1604,8 @@ struct intel_psr {
        bool psr2_sel_fetch_cff_enabled;
        bool req_psr2_sdp_prior_scanline;
        u8 sink_sync_latency;
+       u8 io_wake_lines;
+       u8 fast_wake_lines;
        ktime_t last_entry_attempt;
        ktime_t last_exit;
        bool sink_not_reliable;

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 15c3e448aa0e6e0863bd8049b4aee95eabdcd81d..bf18423c7a005522c8a4637e66ab90590b4a12e9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -542,6 +542,14 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
        val |= EDP_PSR2_FRAME_BEFORE_SU(max_t(u8, intel_dp->psr.sink_sync_latency + 1, 2));
        val |= intel_psr2_get_tp_time(intel_dp);
 
+       if (DISPLAY_VER(dev_priv) >= 12) {
+               if (intel_dp->psr.io_wake_lines < 9 &&
+                   intel_dp->psr.fast_wake_lines < 9)
+                       val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
+               else
+                       val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_3;
+       }
+
        /* Wa_22012278275:adl-p */
        if (IS_ADLP_DISPLAY_STEP(dev_priv, STEP_A0, STEP_E0)) {
                static const u8 map[] = {
@@ -558,31 +566,21 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
                 * Still using the default IO_BUFFER_WAKE and FAST_WAKE, see
                 * comments bellow for more information
                 */
-               u32 tmp, lines = 7;
-
-               val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
+               u32 tmp;
 
-               tmp = map[lines - TGL_EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES];
+               tmp = map[intel_dp->psr.io_wake_lines - TGL_EDP_PSR2_IO_BUFFER_WAKE_MIN_LINES];
                tmp = tmp << TGL_EDP_PSR2_IO_BUFFER_WAKE_SHIFT;
                val |= tmp;
 
-               tmp = map[lines - TGL_EDP_PSR2_FAST_WAKE_MIN_LINES];
+               tmp = map[intel_dp->psr.fast_wake_lines - TGL_EDP_PSR2_FAST_WAKE_MIN_LINES];
                tmp = tmp << TGL_EDP_PSR2_FAST_WAKE_MIN_SHIFT;
                val |= tmp;
        } else if (DISPLAY_VER(dev_priv) >= 12) {
-               /*
-                * TODO: 7 lines of IO_BUFFER_WAKE and FAST_WAKE are default
-                * values from BSpec. In order to setting an optimal power
-                * consumption, lower than 4k resolution mode needs to decrease
-                * IO_BUFFER_WAKE and FAST_WAKE. And higher than 4K resolution
-                * mode needs to increase IO_BUFFER_WAKE and FAST_WAKE.
-                */
-               val |= TGL_EDP_PSR2_BLOCK_COUNT_NUM_2;
-               val |= TGL_EDP_PSR2_IO_BUFFER_WAKE(7);
-               val |= TGL_EDP_PSR2_FAST_WAKE(7);
+               val |= TGL_EDP_PSR2_IO_BUFFER_WAKE(intel_dp->psr.io_wake_lines);
+               val |= TGL_EDP_PSR2_FAST_WAKE(intel_dp->psr.fast_wake_lines);
        } else if (DISPLAY_VER(dev_priv) >= 9) {
-               val |= EDP_PSR2_IO_BUFFER_WAKE(7);
-               val |= EDP_PSR2_FAST_WAKE(7);
+               val |= EDP_PSR2_IO_BUFFER_WAKE(intel_dp->psr.io_wake_lines);
+               val |= EDP_PSR2_FAST_WAKE(intel_dp->psr.fast_wake_lines);
        }
 
        if (intel_dp->psr.req_psr2_sdp_prior_scanline)
@@ -837,6 +835,46 @@ static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_dp *intel_d
        return true;
 }
 
+static bool _compute_psr2_wake_times(struct intel_dp *intel_dp,
+                                    struct intel_crtc_state *crtc_state)
+{
+       struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+       int io_wake_lines, io_wake_time, fast_wake_lines, fast_wake_time;
+       u8 max_wake_lines;
+
+       if (DISPLAY_VER(i915) >= 12) {
+               io_wake_time = 42;
+               /*
+                * According to Bspec it's 42us, but based on testing
+                * it is not enough -> use 45 us.
+                */
+               fast_wake_time = 45;
+               max_wake_lines = 12;
+       } else {
+               io_wake_time = 50;
+               fast_wake_time = 32;
+               max_wake_lines = 8;
+       }
+
+       io_wake_lines = intel_usecs_to_scanlines(
+               &crtc_state->uapi.adjusted_mode, io_wake_time);
+       fast_wake_lines = intel_usecs_to_scanlines(
+               &crtc_state->uapi.adjusted_mode, fast_wake_time);
+
+       if (io_wake_lines > max_wake_lines ||
+           fast_wake_lines > max_wake_lines)
+               return false;
+
+       if (i915->params.psr_safest_params)
+               io_wake_lines = fast_wake_lines = max_wake_lines;
+
+       /* According to Bspec lower limit should be set as 7 lines. */
+       intel_dp->psr.io_wake_lines = max(io_wake_lines, 7);
+       intel_dp->psr.fast_wake_lines = max(fast_wake_lines, 7);
+
+       return true;
+}
+
 static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
                                    struct intel_crtc_state *crtc_state)
 {
@@ -930,6 +968,12 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
                return false;
        }
 
+       if (!_compute_psr2_wake_times(intel_dp, crtc_state)) {
+               drm_dbg_kms(&dev_priv->drm,
+                           "PSR2 not enabled, Unable to use long enough wake times\n");
+               return false;
+       }
+
        if (HAS_PSR2_SEL_FETCH(dev_priv)) {
                if (!intel_psr2_sel_fetch_config_valid(intel_dp, crtc_state) &&
                    !HAS_PSR_HW_TRACKING(dev_priv)) {