drm/i915: Upscale scaler max scale for NV12

This patch updates scaler max limit support for NV12

v2: Rebased (me)

v3: Rebased (me)

v4: Missed the Tested-by/Reviewed-by in the previous series
Adding the same to commit message in this version.

v5: Addressed review comments from Ville and rebased
- calculation of max_scale to be made
less convoluted by splitting it up a bit
- Indentation errors to be fixed in the series

v6: Rebased (me)
Fixed review comments from Paauwe, Bob J
Previous version, where a split of calculation
was done, was wrong. Fixed that issue here.

v7: Rebased (me)

v8: Rebased (me)

v9: Rebased (me)

v10: Rebased (me)

v11: Addressed review comments from Shashank Sharma
Alignment issues fixed.
When call to skl_update_scaler is made, 0 was being
sent instead of pixel_format.
When crtc update scaler is called, we dont have the
fb to derive the pixel format. Added the function
parameter bool plane_scaler_check to account for this.

v12: Fixed failure in IGT debugfs_test.
fb is NULL in skl_update_scaler_plane
Due to this, accessing fb->format caused failure.
Patch checks fb before using.

v13: In the previous version there was a flaw.
In skl_update_scaler during plane_scaler_check
if the format was non-NV12, it would set need_scaling
to false. This could reset the previously set need_scaling
from a previous condition check. Patch fixes this.
Patch also adds minimum src height for YUV 420 formats
to 16 (as defined in BSpec) and adds for checking this
range.

v14: Addressed review comments from Maarten
Just add a check for NV12 min src height in
skl_update_scaler and retain the remaining checks
as is. Added Reviewed By from Juha-Pekka Heikkila.

v15: Rebased the series.

v16: Changed fb height restriction to be >= 16 as per
Bspec. Earlier it was > 16.

v17: Adding src width and height to be mult of 4 restriction
to avoid pipe fifo underruns for NV12.

Credits-to: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Tested-by: Clinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: Clinton Taylor <clinton.a.taylor@intel.com>
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1523245273-30264-15-git-send-email-vidya.srinivas@intel.com

3 files changed, 46 insertions, 13 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index eb9d4e7f9160..fec3d6dd5c60 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3483,6 +3483,8 @@ static u32 skl_plane_ctl_format(uint32_t pixel_format)
                 return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_UYVY;
         case DRM_FORMAT_VYUY:
                 return PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
+        case DRM_FORMAT_NV12:
+                return PLANE_CTL_FORMAT_NV12;
         default:
                 MISSING_CASE(pixel_format);
         }
@@ -4724,7 +4726,9 @@ static void cpt_verify_modeset(struct drm_device *dev, int pipe)
 static int
 skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
                   unsigned int scaler_user, int *scaler_id,
-                  int src_w, int src_h, int dst_w, int dst_h)
+                  int src_w, int src_h, int dst_w, int dst_h,
+                  bool plane_scaler_check,
+                  uint32_t pixel_format)
 {
         struct intel_crtc_scaler_state *scaler_state =
                 &crtc_state->scaler_state;
@@ -4742,6 +4746,10 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
          */
         need_scaling = src_w != dst_w || src_h != dst_h;
 
+        if (plane_scaler_check)
+                if (pixel_format == DRM_FORMAT_NV12)
+                        need_scaling = true;
+
         if (crtc_state->ycbcr420 && scaler_user == SKL_CRTC_INDEX)
                 need_scaling = true;
 
@@ -4781,6 +4789,13 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
                 return 0;
         }
 
+        if (plane_scaler_check && pixel_format == DRM_FORMAT_NV12 &&
+            (src_h < SKL_MIN_YUV_420_SRC_H || (src_w % 4) != 0 ||
+             (src_h % 4) != 0)) {
+                DRM_DEBUG_KMS("NV12: src dimensions not met\n");
+                return -EINVAL;
+        }
+
         /* range checks */
         if (src_w < SKL_MIN_SRC_W || src_h < SKL_MIN_SRC_H ||
             dst_w < SKL_MIN_DST_W || dst_h < SKL_MIN_DST_H ||
@@ -4820,9 +4835,10 @@ int skl_update_scaler_crtc(struct intel_crtc_state *state)
         const struct drm_display_mode *adjusted_mode = &state->base.adjusted_mode;
 
         return skl_update_scaler(state, !state->base.active, SKL_CRTC_INDEX,
-                &state->scaler_state.scaler_id,
-                state->pipe_src_w, state->pipe_src_h,
-                adjusted_mode->crtc_hdisplay, adjusted_mode->crtc_vdisplay);
+                                 &state->scaler_state.scaler_id,
+                                 state->pipe_src_w, state->pipe_src_h,
+                                 adjusted_mode->crtc_hdisplay,
+                                 adjusted_mode->crtc_vdisplay, false, 0);
 }
 
 /**
@@ -4851,7 +4867,8 @@ static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
                                 drm_rect_width(&plane_state->base.src) >> 16,
                                 drm_rect_height(&plane_state->base.src) >> 16,
                                 drm_rect_width(&plane_state->base.dst),
-                                drm_rect_height(&plane_state->base.dst));
+                                drm_rect_height(&plane_state->base.dst),
+                                fb ? true : false, fb ? fb->format->format : 0);
 
         if (ret || plane_state->scaler_id < 0)
                 return ret;
@@ -4877,6 +4894,7 @@ static int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
         case DRM_FORMAT_YVYU:
         case DRM_FORMAT_UYVY:
         case DRM_FORMAT_VYUY:
+        case DRM_FORMAT_NV12:
                 break;
         default:
                 DRM_DEBUG_KMS("[PLANE:%d:%s] FB:%d unsupported scaling format 0x%x\n",
@@ -12877,11 +12895,13 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
 }
 
 int
-skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state)
+skl_max_scale(struct intel_crtc *intel_crtc,
+              struct intel_crtc_state *crtc_state,
+              uint32_t pixel_format)
 {
         struct drm_i915_private *dev_priv;
-        int max_scale;
-        int crtc_clock, max_dotclk;
+        int max_scale, mult;
+        int crtc_clock, max_dotclk, tmpclk1, tmpclk2;
 
         if (!intel_crtc || !crtc_state->base.enable)
                 return DRM_PLANE_HELPER_NO_SCALING;
@@ -12903,8 +12923,10 @@ skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state
          *            or
          *    cdclk/crtc_clock
          */
-        max_scale = min((1 << 16) * 3 - 1,
-                        (1 << 8) * ((max_dotclk << 8) / crtc_clock));
+        mult = pixel_format == DRM_FORMAT_NV12 ? 2 : 3;
+        tmpclk1 = (1 << 16) * mult - 1;
+        tmpclk2 = (1 << 8) * ((max_dotclk << 8) / crtc_clock);
+        max_scale = min(tmpclk1, tmpclk2);
 
         return max_scale;
 }
@@ -12920,12 +12942,16 @@ intel_check_primary_plane(struct intel_plane *plane,
         int max_scale = DRM_PLANE_HELPER_NO_SCALING;
         bool can_position = false;
         int ret;
+        uint32_t pixel_format = 0;
 
         if (INTEL_GEN(dev_priv) >= 9) {
                 /* use scaler when colorkey is not required */
                 if (!state->ckey.flags) {
                         min_scale = 1;
-                        max_scale = skl_max_scale(to_intel_crtc(crtc), crtc_state);
+                        if (state->base.fb)
+                                pixel_format = state->base.fb->format->format;
+                        max_scale = skl_max_scale(to_intel_crtc(crtc),
+                                                  crtc_state, pixel_format);
                 }
                 can_position = true;
         }
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a6d7d856ea62..b2e0fa04ef5b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -552,6 +552,8 @@ struct intel_initial_plane_config {
 #define ICL_MAX_SRC_H 4096
 #define ICL_MAX_DST_W 5120
 #define ICL_MAX_DST_H 4096
+#define SKL_MIN_YUV_420_SRC_W 16
+#define SKL_MIN_YUV_420_SRC_H 16
 
 struct intel_scaler {
         int in_use;
@@ -1597,7 +1599,8 @@ void intel_mode_from_pipe_config(struct drm_display_mode *mode,
                                  struct intel_crtc_state *pipe_config);
 
 int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
-int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);
+int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
+                  uint32_t pixel_format);
 
 static inline u32 intel_plane_ggtt_offset(const struct intel_plane_state *state)
 {
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 0652e583b03d..aa1dfaa692b9 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -947,6 +947,7 @@ intel_check_sprite_plane(struct intel_plane *plane,
         int max_scale, min_scale;
         bool can_scale;
         int ret;
+        uint32_t pixel_format = 0;
 
         *src = drm_plane_state_src(&state->base);
         *dst = drm_plane_state_dest(&state->base);
@@ -970,11 +971,14 @@ intel_check_sprite_plane(struct intel_plane *plane,
 
         /* setup can_scale, min_scale, max_scale */
         if (INTEL_GEN(dev_priv) >= 9) {
+                if (state->base.fb)
+                        pixel_format = state->base.fb->format->format;
                 /* use scaler when colorkey is not required */
                 if (!state->ckey.flags) {
                         can_scale = 1;
                         min_scale = 1;
-                        max_scale = skl_max_scale(crtc, crtc_state);
+                        max_scale =
+                                skl_max_scale(crtc, crtc_state, pixel_format);
                 } else {
                         can_scale = 0;
                         min_scale = DRM_PLANE_HELPER_NO_SCALING;