drm/i915: Add .max_stride() plane hook

Each plane may have different stride limitations. Let's add a new
plane function to retutn the maximum stride for each plane. There's
going to be some use for this outside the .atomic_check() stuff hence
the separate hook.

v2: Fix ilk+ x-tiled max stride to be 32k (José)
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180907152413.15761-3-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -3213,6 +3213,33 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
+unsigned int
+i9xx_plane_max_stride(struct intel_plane *plane,
+		      u32 pixel_format, u64 modifier,
+		      unsigned int rotation)
+{
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
+
+	if (!HAS_GMCH_DISPLAY(dev_priv)) {
+		return 32*1024;
+	} else if (INTEL_GEN(dev_priv) >= 4) {
+		if (modifier == I915_FORMAT_MOD_X_TILED)
+			return 16*1024;
+		else
+			return 32*1024;
+	} else if (INTEL_GEN(dev_priv) >= 3) {
+		if (modifier == I915_FORMAT_MOD_X_TILED)
+			return 8*1024;
+		else
+			return 16*1024;
+	} else {
+		if (plane->i9xx_plane == PLANE_C)
+			return 4*1024;
+		else
+			return 8*1024;
+	}
+}
+
 static u32 i9xx_plane_ctl(const struct intel_crtc_state *crtc_state,
 			  const struct intel_plane_state *plane_state)
 {
@@ -9681,6 +9708,14 @@ static int intel_check_cursor(struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
+static unsigned int
+i845_cursor_max_stride(struct intel_plane *plane,
+		       u32 pixel_format, u64 modifier,
+		       unsigned int rotation)
+{
+	return 2048;
+}
+
 static u32 i845_cursor_ctl(const struct intel_crtc_state *crtc_state,
 			   const struct intel_plane_state *plane_state)
 {
@@ -9813,6 +9848,14 @@ static bool i845_cursor_get_hw_state(struct intel_plane *plane,
 	return ret;
 }
 
+static unsigned int
+i9xx_cursor_max_stride(struct intel_plane *plane,
+		       u32 pixel_format, u64 modifier,
+		       unsigned int rotation)
+{
+	return plane->base.dev->mode_config.cursor_width * 4;
+}
+
 static u32 i9xx_cursor_ctl(const struct intel_crtc_state *crtc_state,
 			   const struct intel_plane_state *plane_state)
 {
@@ -13727,6 +13770,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 		else
 			modifiers = skl_format_modifiers_noccs;
 
+		primary->max_stride = skl_plane_max_stride;
 		primary->update_plane = skl_update_plane;
 		primary->disable_plane = skl_disable_plane;
 		primary->get_hw_state = skl_plane_get_hw_state;
@@ -13737,6 +13781,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 		num_formats = ARRAY_SIZE(i965_primary_formats);
 		modifiers = i9xx_format_modifiers;
 
+		primary->max_stride = i9xx_plane_max_stride;
 		primary->update_plane = i9xx_update_plane;
 		primary->disable_plane = i9xx_disable_plane;
 		primary->get_hw_state = i9xx_plane_get_hw_state;
@@ -13747,6 +13792,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 		num_formats = ARRAY_SIZE(i8xx_primary_formats);
 		modifiers = i9xx_format_modifiers;
 
+		primary->max_stride = i9xx_plane_max_stride;
 		primary->update_plane = i9xx_update_plane;
 		primary->disable_plane = i9xx_disable_plane;
 		primary->get_hw_state = i9xx_plane_get_hw_state;
@@ -13854,11 +13900,13 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv,
 	cursor->frontbuffer_bit = INTEL_FRONTBUFFER(pipe, cursor->id);
 
 	if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
+		cursor->max_stride = i845_cursor_max_stride;
 		cursor->update_plane = i845_update_cursor;
 		cursor->disable_plane = i845_disable_cursor;
 		cursor->get_hw_state = i845_cursor_get_hw_state;
 		cursor->check_plane = i845_check_cursor;
 	} else {
+		cursor->max_stride = i9xx_cursor_max_stride;
 		cursor->update_plane = i9xx_update_cursor;
 		cursor->disable_plane = i9xx_disable_cursor;
 		cursor->get_hw_state = i9xx_cursor_get_hw_state;

drivers/gpu/drm/i915/intel_drv.h

@@ -965,6 +965,9 @@ struct intel_plane {
 	 * the intel_plane_state structure and accessed via plane_state.
 	 */
 
+	unsigned int (*max_stride)(struct intel_plane *plane,
+				   u32 pixel_format, u64 modifier,
+				   unsigned int rotation);
 	void (*update_plane)(struct intel_plane *plane,
 			     const struct intel_crtc_state *crtc_state,
 			     const struct intel_plane_state *plane_state);
@@ -1660,6 +1663,9 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
 			    struct intel_plane_state *plane_state);
 int i9xx_check_plane_surface(struct intel_plane_state *plane_state);
 int skl_format_to_fourcc(int format, bool rgb_order, bool alpha);
+unsigned int i9xx_plane_max_stride(struct intel_plane *plane,
+				   u32 pixel_format, u64 modifier,
+				   unsigned int rotation);
 
 /* intel_csr.c */
 void intel_csr_ucode_init(struct drm_i915_private *);
@@ -2127,6 +2133,10 @@ bool skl_plane_has_ccs(struct drm_i915_private *dev_priv,
 		       enum pipe pipe, enum plane_id plane_id);
 bool skl_plane_has_planar(struct drm_i915_private *dev_priv,
 			  enum pipe pipe, enum plane_id plane_id);
+unsigned int skl_plane_max_stride(struct intel_plane *plane,
+				  u32 pixel_format, u64 modifier,
+				  unsigned int rotation);
+
 
 /* intel_tv.c */
 void intel_tv_init(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/intel_sprite.c

@@ -230,6 +230,23 @@ void intel_pipe_update_end(struct intel_crtc_state *new_crtc_state)
 #endif
 }
 
+unsigned int
+skl_plane_max_stride(struct intel_plane *plane,
+		     u32 pixel_format, u64 modifier,
+		     unsigned int rotation)
+{
+	int cpp = drm_format_plane_cpp(pixel_format, 0);
+
+	/*
+	 * "The stride in bytes must not exceed the
+	 * of the size of 8K pixels and 32K bytes."
+	 */
+	if (drm_rotation_90_or_270(rotation))
+		return min(8192, 32768 / cpp);
+	else
+		return min(8192 * cpp, 32768);
+}
+
 void
 skl_update_plane(struct intel_plane *plane,
 		 const struct intel_crtc_state *crtc_state,
@@ -800,6 +817,14 @@ ivb_plane_get_hw_state(struct intel_plane *plane,
 	return ret;
 }
 
+static unsigned int
+g4x_sprite_max_stride(struct intel_plane *plane,
+		      u32 pixel_format, u64 modifier,
+		      unsigned int rotation)
+{
+	return 16384;
+}
+
 static u32 g4x_sprite_ctl(const struct intel_crtc_state *crtc_state,
 			  const struct intel_plane_state *plane_state)
 {
@@ -966,7 +991,6 @@ intel_check_sprite_plane(struct intel_crtc_state *crtc_state,
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 	struct drm_framebuffer *fb = state->base.fb;
-	int max_stride = INTEL_GEN(dev_priv) >= 9 ? 32768 : 16384;
 	int max_scale, min_scale;
 	bool can_scale;
 	int ret;
@@ -984,7 +1008,9 @@ intel_check_sprite_plane(struct intel_crtc_state *crtc_state,
 	}
 
 	/* FIXME check all gen limits */
-	if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > max_stride) {
+	if (fb->width < 3 || fb->height < 3 ||
+	    fb->pitches[0] > plane->max_stride(plane, fb->format->format,
+					       fb->modifier, DRM_MODE_ROTATE_0)) {
 		DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
 		return -EINVAL;
 	}
@@ -1529,6 +1555,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 		intel_plane->has_ccs = skl_plane_has_ccs(dev_priv, pipe,
 							 PLANE_SPRITE0 + plane);
 
+		intel_plane->max_stride = skl_plane_max_stride;
 		intel_plane->update_plane = skl_update_plane;
 		intel_plane->disable_plane = skl_disable_plane;
 		intel_plane->get_hw_state = skl_plane_get_hw_state;
@@ -1552,6 +1579,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 		intel_plane->can_scale = false;
 		intel_plane->max_downscale = 1;
 
+		intel_plane->max_stride = i9xx_plane_max_stride;
 		intel_plane->update_plane = vlv_update_plane;
 		intel_plane->disable_plane = vlv_disable_plane;
 		intel_plane->get_hw_state = vlv_plane_get_hw_state;
@@ -1570,6 +1598,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 			intel_plane->max_downscale = 1;
 		}
 
+		intel_plane->max_stride = g4x_sprite_max_stride;
 		intel_plane->update_plane = ivb_update_plane;
 		intel_plane->disable_plane = ivb_disable_plane;
 		intel_plane->get_hw_state = ivb_plane_get_hw_state;
@@ -1583,6 +1612,7 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 		intel_plane->can_scale = true;
 		intel_plane->max_downscale = 16;
 
+		intel_plane->max_stride = g4x_sprite_max_stride;
 		intel_plane->update_plane = g4x_update_plane;
 		intel_plane->disable_plane = g4x_disable_plane;
 		intel_plane->get_hw_state = g4x_plane_get_hw_state;