drm/i915: Track pfit enable state separately from size

Detangle the additional state of whether or not the hw has the pfit
enabled from whether it has zero size. This allows us to cleanly
distinguish in the code when we expect the pfit to be enabled (for
Haswell pc8), and when the BIOS is confused and needs sanitizing.

Reported-by: shui yanwei <yangweix.shui@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68251
Tested-by: shui yanwei <yangweix.shui@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

5 files changed, 19 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 63aca49d11a8..63de2701b974 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -778,7 +778,7 @@ void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
                         /* Can only use the always-on power well for eDP when
                          * not using the panel fitter, and when not using motion
                           * blur mitigation (which we don't support). */
-                        if (intel_crtc->config.pch_pfit.size)
+                        if (intel_crtc->config.pch_pfit.enabled)
                                 temp |= TRANS_DDI_EDP_INPUT_A_ONOFF;
                         else
                                 temp |= TRANS_DDI_EDP_INPUT_A_ON;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2489d0b4c7d2..375e6a76a755 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2249,7 +2249,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                 I915_WRITE(PIPESRC(intel_crtc->pipe),
                            ((crtc->mode.hdisplay - 1) << 16) |
                            (crtc->mode.vdisplay - 1));
-                if (!intel_crtc->config.pch_pfit.size &&
+                if (!intel_crtc->config.pch_pfit.enabled &&
                     (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
                      intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
                         I915_WRITE(PF_CTL(intel_crtc->pipe), 0);
@@ -3203,7 +3203,7 @@ static void ironlake_pfit_enable(struct intel_crtc *crtc)
         struct drm_i915_private *dev_priv = dev->dev_private;
         int pipe = crtc->pipe;
 
-        if (crtc->config.pch_pfit.size) {
+        if (crtc->config.pch_pfit.enabled) {
                 /* Force use of hard-coded filter coefficients
                  * as some pre-programmed values are broken,
                  * e.g. x201.
@@ -3428,7 +3428,7 @@ static void ironlake_pfit_disable(struct intel_crtc *crtc)
 
         /* To avoid upsetting the power well on haswell only disable the pfit if
          * it's in use. The hw state code will make sure we get this right. */
-        if (crtc->config.pch_pfit.size) {
+        if (crtc->config.pch_pfit.enabled) {
                 I915_WRITE(PF_CTL(pipe), 0);
                 I915_WRITE(PF_WIN_POS(pipe), 0);
                 I915_WRITE(PF_WIN_SZ(pipe), 0);
@@ -5859,6 +5859,7 @@ static void ironlake_get_pfit_config(struct intel_crtc *crtc,
         tmp = I915_READ(PF_CTL(crtc->pipe));
 
         if (tmp & PF_ENABLE) {
+                pipe_config->pch_pfit.enabled = true;
                 pipe_config->pch_pfit.pos = I915_READ(PF_WIN_POS(crtc->pipe));
                 pipe_config->pch_pfit.size = I915_READ(PF_WIN_SZ(crtc->pipe));
 
@@ -6236,7 +6237,7 @@ static void haswell_modeset_global_resources(struct drm_device *dev)
                 if (!crtc->base.enabled)
                         continue;
 
-                if (crtc->pipe != PIPE_A || crtc->config.pch_pfit.size ||
+                if (crtc->pipe != PIPE_A || crtc->config.pch_pfit.enabled ||
                     crtc->config.cpu_transcoder != TRANSCODER_EDP)
                         enable = true;
         }
@@ -8205,9 +8206,10 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
                       pipe_config->gmch_pfit.control,
                       pipe_config->gmch_pfit.pgm_ratios,
                       pipe_config->gmch_pfit.lvds_border_bits);
-        DRM_DEBUG_KMS("pch pfit: pos: 0x%08x, size: 0x%08x\n",
+        DRM_DEBUG_KMS("pch pfit: pos: 0x%08x, size: 0x%08x, %s\n",
                       pipe_config->pch_pfit.pos,
-                      pipe_config->pch_pfit.size);
+                      pipe_config->pch_pfit.size,
+                      pipe_config->pch_pfit.enabled ? "enabled" : "disabled");
         DRM_DEBUG_KMS("ips: %i\n", pipe_config->ips_enabled);
 }
 
@@ -8603,8 +8605,11 @@ intel_pipe_config_compare(struct drm_device *dev,
         if (INTEL_INFO(dev)->gen < 4)
                 PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios);
         PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits);
-        PIPE_CONF_CHECK_I(pch_pfit.pos);
-        PIPE_CONF_CHECK_I(pch_pfit.size);
+        PIPE_CONF_CHECK_I(pch_pfit.enabled);
+        if (current_config->pch_pfit.enabled) {
+                PIPE_CONF_CHECK_I(pch_pfit.pos);
+                PIPE_CONF_CHECK_I(pch_pfit.size);
+        }
 
         PIPE_CONF_CHECK_I(ips_enabled);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a47799e832c6..28cae80495e2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -280,6 +280,7 @@ struct intel_crtc_config {
         struct {
                 u32 pos;
                 u32 size;
+                bool enabled;
         } pch_pfit;
 
         /* FDI configuration, only valid if has_pch_encoder is set. */
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 42114ecbae0e..293564a2896a 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -112,6 +112,7 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
 done:
         pipe_config->pch_pfit.pos = (x << 16) | y;
         pipe_config->pch_pfit.size = (width << 16) | height;
+        pipe_config->pch_pfit.enabled = pipe_config->pch_pfit.size != 0;
 }
 
 static void
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0c115cc4899f..dd176b7296c1 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2096,16 +2096,16 @@ static uint32_t ilk_pipe_pixel_rate(struct drm_device *dev,
                                     struct drm_crtc *crtc)
 {
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-        uint32_t pixel_rate, pfit_size;
+        uint32_t pixel_rate;
 
         pixel_rate = intel_crtc->config.adjusted_mode.clock;
 
         /* We only use IF-ID interlacing. If we ever use PF-ID we'll need to
          * adjust the pixel_rate here. */
 
-        pfit_size = intel_crtc->config.pch_pfit.size;
-        if (pfit_size) {
+        if (intel_crtc->config.pch_pfit.enabled) {
                 uint64_t pipe_w, pipe_h, pfit_w, pfit_h;
+                uint32_t pfit_size = intel_crtc->config.pch_pfit.size;
 
                 pipe_w = intel_crtc->config.requested_mode.hdisplay;
                 pipe_h = intel_crtc->config.requested_mode.vdisplay;