Re: [v2 1/6] drm/i915/skl+: Use plane size for relative data rate calculation

["Kumar, Shobhit" <shobhit.kumar@linux.intel.com>]

On 01/27/2016 09:39 PM, Shobhit Kumar wrote:
> From: "Kumar, Mahesh" <mahesh1.kumar@intel.com>
>
> Use plane size for relative data rate calculation. don't always use
> pipe source width & height.
> adjust height & width according to rotation.
> use plane size for watermark calculations also.
>
> v2: Address Matt's comments.
>      Use intel_plane_state->visible to avoid divide-by-zero error.
>      Where FB was present but not visible so causing total data rate to
>      be zero, hence divide-by-zero.
>

Matt, request you to have a re-look at this series.

Regards
Shobhit

> Cc: matthew.d.roper@intel.com
> Signed-off-by: Kumar, Mahesh <mahesh1.kumar@intel.com>
> ---
>   drivers/gpu/drm/i915/intel_pm.c | 42 ++++++++++++++++++++++++++---------------
>   1 file changed, 27 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 20bf854..d55e5d0 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2868,25 +2868,28 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
>   			     const struct drm_plane_state *pstate,
>   			     int y)
>   {
> -	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
> +	struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate);
>   	struct drm_framebuffer *fb = pstate->fb;
> +	uint32_t width = 0, height = 0;
> +
> +	width = drm_rect_width(&intel_pstate->src) >> 16;
> +	height = drm_rect_height(&intel_pstate->src) >> 16;
> +
> +	if (intel_rotation_90_or_270(pstate->rotation))
> +		swap(width, height);
>
>   	/* for planar format */
>   	if (fb->pixel_format == DRM_FORMAT_NV12) {
>   		if (y)  /* y-plane data rate */
> -			return intel_crtc->config->pipe_src_w *
> -				intel_crtc->config->pipe_src_h *
> +			return width * height *
>   				drm_format_plane_cpp(fb->pixel_format, 0);
>   		else    /* uv-plane data rate */
> -			return (intel_crtc->config->pipe_src_w/2) *
> -				(intel_crtc->config->pipe_src_h/2) *
> +			return (width / 2) * (height / 2) *
>   				drm_format_plane_cpp(fb->pixel_format, 1);
>   	}
>
>   	/* for packed formats */
> -	return intel_crtc->config->pipe_src_w *
> -		intel_crtc->config->pipe_src_h *
> -		drm_format_plane_cpp(fb->pixel_format, 0);
> +	return width * height * drm_format_plane_cpp(fb->pixel_format, 0);
>   }
>
>   /*
> @@ -2905,9 +2908,8 @@ skl_get_total_relative_data_rate(const struct intel_crtc_state *cstate)
>   	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
>   		const struct drm_plane_state *pstate = intel_plane->base.state;
>
> -		if (pstate->fb == NULL)
> +		if (!to_intel_plane_state(pstate)->visible)
>   			continue;
> -
>   		if (intel_plane->base.type == DRM_PLANE_TYPE_CURSOR)
>   			continue;
>
> @@ -2965,8 +2967,9 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
>   		struct drm_framebuffer *fb = plane->state->fb;
>   		int id = skl_wm_plane_id(intel_plane);
>
> -		if (fb == NULL)
> +		if (!to_intel_plane_state(plane->state)->visible)
>   			continue;
> +
>   		if (plane->type == DRM_PLANE_TYPE_CURSOR)
>   			continue;
>
> @@ -2992,7 +2995,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
>   		uint16_t plane_blocks, y_plane_blocks = 0;
>   		int id = skl_wm_plane_id(intel_plane);
>
> -		if (pstate->fb == NULL)
> +		if (!to_intel_plane_state(pstate)->visible)
>   			continue;
>   		if (plane->type == DRM_PLANE_TYPE_CURSOR)
>   			continue;
> @@ -3116,28 +3119,37 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
>   {
>   	struct drm_plane *plane = &intel_plane->base;
>   	struct drm_framebuffer *fb = plane->state->fb;
> +	struct intel_plane_state *intel_pstate =
> +					to_intel_plane_state(plane->state);
>   	uint32_t latency = dev_priv->wm.skl_latency[level];
>   	uint32_t method1, method2;
>   	uint32_t plane_bytes_per_line, plane_blocks_per_line;
>   	uint32_t res_blocks, res_lines;
>   	uint32_t selected_result;
>   	uint8_t bytes_per_pixel;
> +	uint32_t width = 0, height = 0;
>
> -	if (latency == 0 || !cstate->base.active || !fb)
> +	if (latency == 0 || !cstate->base.active || !intel_pstate->visible)
>   		return false;
>
> +	width = drm_rect_width(&intel_pstate->src) >> 16;
> +	height = drm_rect_height(&intel_pstate->src) >> 16;
> +
> +	if (intel_rotation_90_or_270(plane->state->rotation))
> +		swap(width, height);
> +
>   	bytes_per_pixel = drm_format_plane_cpp(fb->pixel_format, 0);
>   	method1 = skl_wm_method1(skl_pipe_pixel_rate(cstate),
>   				 bytes_per_pixel,
>   				 latency);
>   	method2 = skl_wm_method2(skl_pipe_pixel_rate(cstate),
>   				 cstate->base.adjusted_mode.crtc_htotal,
> -				 cstate->pipe_src_w,
> +				 width,
>   				 bytes_per_pixel,
>   				 fb->modifier[0],
>   				 latency);
>
> -	plane_bytes_per_line = cstate->pipe_src_w * bytes_per_pixel;
> +	plane_bytes_per_line = width * bytes_per_pixel;
>   	plane_blocks_per_line = DIV_ROUND_UP(plane_bytes_per_line, 512);
>
>   	if (fb->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
>
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