Re: [PATCH 21/21 v2] drm/i915: Enable skylake sprite plane scaling using shared scalers

[Matt Roper <matthew.d.roper@intel.com>]

On Fri, Mar 20, 2015 at 05:04:42PM -0700, Chandra Konduru wrote:
> This patch enables skylake sprite plane display scaling using shared
> scalers atomic desgin.
> 
> v2:
> -use single copy of scaler limits (Matt)
> 
> Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_sprite.c |   79 +++++++++++++++++++++++++++--------
>  1 file changed, 61 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index 0194390..b4452bc 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -33,6 +33,7 @@
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_rect.h>
> +#include <drm/drm_atomic.h>
>  #include <drm/drm_plane_helper.h>
>  #include "intel_drv.h"
>  #include <drm/i915_drm.h>
> @@ -191,6 +192,8 @@ skl_update_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc,
>  	const int plane = intel_plane->plane + 1;
>  	u32 plane_ctl, stride_div;
>  	int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
> +	struct intel_crtc_state *crtc_state = to_intel_crtc(crtc)->config;
> +	int scaler_id;
>  
>  	plane_ctl = I915_READ(PLANE_CTL(pipe, plane));
>  
> @@ -274,16 +277,39 @@ skl_update_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc,
>  	stride_div = intel_fb_stride_alignment(dev, fb->modifier[0],
>  					       fb->pixel_format);
>  
> +	skl_detach_scaler(crtc, drm_plane);
> +	scaler_id = to_intel_plane_state(drm_plane->state)->scaler_id;
> +
>  	/* Sizes are 0 based */
>  	src_w--;
>  	src_h--;
>  	crtc_w--;
>  	crtc_h--;
>  
> +	/* program plane scaler */
> +	if (scaler_id >= 0) {
> +		uint32_t ps_ctrl = 0;
> +
> +		DRM_DEBUG_KMS("plane = %d PS_PLANE_SEL(plane) = 0x%x\n", plane,
> +			PS_PLANE_SEL(plane));
> +		ps_ctrl = PS_SCALER_EN | PS_PLANE_SEL(plane) |
> +			crtc_state->scaler_state.scalers[scaler_id].mode |
> +			crtc_state->scaler_state.scalers[scaler_id].filter;
> +		I915_WRITE(SKL_PS_CTRL(pipe, scaler_id), ps_ctrl);
> +		I915_WRITE(SKL_PS_PWR_GATE(pipe, scaler_id), 0);
> +		I915_WRITE(SKL_PS_WIN_POS(pipe, scaler_id), (crtc_x << 16) | crtc_y);
> +		I915_WRITE(SKL_PS_WIN_SZ(pipe, scaler_id),
> +			((crtc_w + 1) << 16)|(crtc_h + 1));
> +
> +		I915_WRITE(PLANE_POS(pipe, plane), 0);
> +		I915_WRITE(PLANE_SIZE(pipe, plane), (src_h << 16) | src_w);
> +	} else {
> +		I915_WRITE(PLANE_POS(pipe, plane), (crtc_y << 16) | crtc_x);
> +		I915_WRITE(PLANE_SIZE(pipe, plane), (crtc_h << 16) | crtc_w);
> +	}

These parts of the last few patches are what I was referring to earlier;
I think rather than programming scaler registers inside the plane update
(which means you have to keep track of who new/old owners are so that
the right plane takes responsibility), it would be easier to just have a
separate step, after planes are done being programmed, that writes the
proper values for each scaler, based on the CRTC scaling state.

> +
>  	I915_WRITE(PLANE_OFFSET(pipe, plane), (y << 16) | x);
>  	I915_WRITE(PLANE_STRIDE(pipe, plane), fb->pitches[0] / stride_div);
> -	I915_WRITE(PLANE_POS(pipe, plane), (crtc_y << 16) | crtc_x);
> -	I915_WRITE(PLANE_SIZE(pipe, plane), (crtc_h << 16) | crtc_w);
>  	I915_WRITE(PLANE_CTL(pipe, plane), plane_ctl);
>  	I915_WRITE(PLANE_SURF(pipe, plane), i915_gem_obj_ggtt_offset(obj));
>  	POSTING_READ(PLANE_SURF(pipe, plane));
> @@ -305,6 +331,8 @@ skl_disable_plane(struct drm_plane *drm_plane, struct drm_crtc *crtc)
>  	I915_WRITE(PLANE_CTL(pipe, plane), 0);
>  	POSTING_READ(PLANE_CTL(pipe, plane));
>  
> +	skl_detach_scaler(crtc, drm_plane);
> +
>  	intel_update_sprite_watermarks(drm_plane, crtc, 0, 0, 0, false, false);
>  }
>  
> @@ -1088,7 +1116,9 @@ static int
>  intel_check_sprite_plane(struct drm_plane *plane,
>  			 struct intel_plane_state *state)
>  {
> +	struct drm_device *dev = plane->dev;
>  	struct intel_crtc *intel_crtc = to_intel_crtc(state->base.crtc);
> +	struct intel_crtc_state *crtc_state;
>  	struct intel_plane *intel_plane = to_intel_plane(plane);
>  	struct drm_framebuffer *fb = state->base.fb;
>  	int crtc_x, crtc_y;
> @@ -1097,11 +1127,16 @@ intel_check_sprite_plane(struct drm_plane *plane,
>  	struct drm_rect *src = &state->src;
>  	struct drm_rect *dst = &state->dst;
>  	const struct drm_rect *clip = &state->clip;
> +	struct intel_crtc_scaler_state *scaler_state;
>  	int hscale, vscale;
>  	int max_scale, min_scale;
>  	int pixel_size;
> +	int ret;
>  
>  	intel_crtc = intel_crtc ? intel_crtc : to_intel_crtc(plane->crtc);
> +	crtc_state = state->base.state ?
> +		intel_atomic_get_crtc_state(state->base.state, intel_crtc) : NULL;
> +	scaler_state = crtc_state ? &crtc_state->scaler_state : NULL;
>  
>  	if (!fb) {
>  		state->visible = false;
> @@ -1128,6 +1163,11 @@ intel_check_sprite_plane(struct drm_plane *plane,
>  	max_scale = intel_plane->max_downscale << 16;
>  	min_scale = intel_plane->can_scale ? 1 : (1 << 16);
>  
> +	if (INTEL_INFO(dev)->gen >= 9 && scaler_state && scaler_state->num_scalers) {
> +		min_scale = 1;
> +		max_scale = (100 << 16) / scaler_state->min_hsr;
> +	}
> +
>  	drm_rect_rotate(src, fb->width << 16, fb->height << 16,
>  			state->base.rotation);
>  
> @@ -1223,18 +1263,18 @@ intel_check_sprite_plane(struct drm_plane *plane,
>  		width_bytes = ((src_x * pixel_size) & 63) +
>  					src_w * pixel_size;
>  
> -		if (src_w > 2048 || src_h > 2048 ||
> -		    width_bytes > 4096 || fb->pitches[0] > 4096) {
> +		if (INTEL_INFO(dev)->gen < 9 && (src_w > 2048 || src_h > 2048 ||
> +		    width_bytes > 4096 || fb->pitches[0] > 4096)) {
>  			DRM_DEBUG_KMS("Source dimensions exceed hardware limits\n");
>  			return -EINVAL;
>  		}
>  	}
>  
>  	if (state->visible) {
> -		src->x1 = src_x;
> -		src->x2 = src_x + src_w;
> -		src->y1 = src_y;
> -		src->y2 = src_y + src_h;
> +		src->x1 = src_x << 16;
> +		src->x2 = (src_x + src_w) << 16;
> +		src->y1 = src_y << 16;
> +		src->y2 = (src_y + src_h) << 16;

This feels unrelated...if we're changing our i915 subclass to use 16.16
format, that should probably be a standalone patch, independent of your
hardware enabling here, with an explanation of why we want to switch.

>  	}
>  
>  	dst->x1 = crtc_x;
> @@ -1271,6 +1311,13 @@ finish:
>  			intel_crtc->atomic.update_wm = true;
>  	}
>  
> +	if (INTEL_INFO(dev)->gen >= 9) {
> +		ret = skl_update_scaler_users(intel_crtc, crtc_state, intel_plane,
> +			state, 0);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	return 0;
>  }
>  
> @@ -1301,10 +1348,10 @@ intel_commit_sprite_plane(struct drm_plane *plane,
>  			crtc_y = state->dst.y1;
>  			crtc_w = drm_rect_width(&state->dst);
>  			crtc_h = drm_rect_height(&state->dst);
> -			src_x = state->src.x1;
> -			src_y = state->src.y1;
> -			src_w = drm_rect_width(&state->src);
> -			src_h = drm_rect_height(&state->src);
> +			src_x = state->src.x1 >> 16;
> +			src_y = state->src.y1 >> 16;
> +			src_w = drm_rect_width(&state->src) >> 16;
> +			src_h = drm_rect_height(&state->src) >> 16;
>  			intel_plane->update_plane(plane, crtc, fb, obj,
>  						  crtc_x, crtc_y, crtc_w, crtc_h,
>  						  src_x, src_y, src_w, src_h);
> @@ -1493,12 +1540,8 @@ intel_plane_init(struct drm_device *dev, enum pipe pipe, int plane)
>  		}
>  		break;
>  	case 9:
> -		/*
> -		 * FIXME: Skylake planes can be scaled (with some restrictions),
> -		 * but this is for another time.
> -		 */
> -		intel_plane->can_scale = false;
> -		intel_plane->max_downscale = 1;
> +		intel_plane->can_scale = true;
> +		intel_plane->max_downscale = 2; /* updated later */
>  		intel_plane->update_plane = skl_update_plane;
>  		intel_plane->disable_plane = skl_disable_plane;
>  		intel_plane->update_colorkey = skl_update_colorkey;
> -- 
> 1.7.9.5
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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