Commit 7084b50b authored by Kumar, Mahesh's avatar Kumar, Mahesh Committed by Matt Roper
Browse files

drm/i915/skl+: calculate pixel_rate & relative_data_rate in fixed point 



This patch make changes to calculate adjusted plane pixel rate &
plane downscale amount using fixed_point functions available.
This patch will give uniformity in code, & will help to avoid mixing of
32bit uint32_t variable for fixed-16.16 with fixed_16_16_t variables in
later patch in the series.

Changes from V1:
 - Rebase based on wrapper name change
 - Remove unnecessary comment

Signed-off-by: default avatarMahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Reviewed-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170517115831.13830-5-mahesh1.kumar@intel.com
parent d273ecce

drivers/gpu/drm/i915/intel_pm.c

+19 −19
Original line number Diff line number Diff line
@@ -3827,26 +3827,27 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv, 
 * Return value is provided in 16.16 fixed point form to retain fractional part.

 * Caller should take care of dividing & rounding off the value.

 */

static uint32_t

static uint_fixed_16_16_t

skl_plane_downscale_amount(const struct intel_crtc_state *cstate,

			   const struct intel_plane_state *pstate)

{

	struct intel_plane *plane = to_intel_plane(pstate->base.plane);

	uint32_t downscale_h, downscale_w;

	uint32_t src_w, src_h, dst_w, dst_h;

	uint_fixed_16_16_t fp_w_ratio, fp_h_ratio;

	uint_fixed_16_16_t downscale_h, downscale_w;



	if (WARN_ON(!intel_wm_plane_visible(cstate, pstate)))

		return DRM_PLANE_HELPER_NO_SCALING;

		return u32_to_fixed_16_16(0);



	/* n.b., src is 16.16 fixed point, dst is whole integer */

	if (plane->id == PLANE_CURSOR) {

		src_w = pstate->base.src_w;

		src_h = pstate->base.src_h;

		src_w = pstate->base.src_w >> 16;

		src_h = pstate->base.src_h >> 16;

		dst_w = pstate->base.crtc_w;

		dst_h = pstate->base.crtc_h;

	} else {

		src_w = drm_rect_width(&pstate->base.src);

		src_h = drm_rect_height(&pstate->base.src);

		src_w = drm_rect_width(&pstate->base.src) >> 16;

		src_h = drm_rect_height(&pstate->base.src) >> 16;

		dst_w = drm_rect_width(&pstate->base.dst);

		dst_h = drm_rect_height(&pstate->base.dst);

	}
@@ -3854,11 +3855,12 @@ skl_plane_downscale_amount(const struct intel_crtc_state *cstate, 
	if (drm_rotation_90_or_270(pstate->base.rotation))

		swap(dst_w, dst_h);



	downscale_h = max(src_h / dst_h, (uint32_t)DRM_PLANE_HELPER_NO_SCALING);

	downscale_w = max(src_w / dst_w, (uint32_t)DRM_PLANE_HELPER_NO_SCALING);

	fp_w_ratio = fixed_16_16_div(src_w, dst_w);

	fp_h_ratio = fixed_16_16_div(src_h, dst_h);

	downscale_w = max_fixed_16_16(fp_w_ratio, u32_to_fixed_16_16(1));

	downscale_h = max_fixed_16_16(fp_h_ratio, u32_to_fixed_16_16(1));



	/* Provide result in 16.16 fixed point */

	return (uint64_t)downscale_w * downscale_h >> 16;

	return mul_fixed16(downscale_w, downscale_h);

}



static unsigned int
@@ -3868,10 +3870,11 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate, 
{

	struct intel_plane *plane = to_intel_plane(pstate->plane);

	struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate);

	uint32_t down_scale_amount, data_rate;

	uint32_t data_rate;

	uint32_t width = 0, height = 0;

	struct drm_framebuffer *fb;

	u32 format;

	uint_fixed_16_16_t down_scale_amount;



	if (!intel_pstate->base.visible)

		return 0;
@@ -3905,7 +3908,7 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate, 


	down_scale_amount = skl_plane_downscale_amount(cstate, intel_pstate);



	return (uint64_t)data_rate * down_scale_amount >> 16;

	return mul_round_up_u32_fixed16(data_rate, down_scale_amount);

}



/*
@@ -4191,8 +4194,7 @@ static uint32_t skl_adjusted_plane_pixel_rate(const struct intel_crtc_state *cst 
					      struct intel_plane_state *pstate)

{

	uint64_t adjusted_pixel_rate;

	uint64_t downscale_amount;

	uint64_t pixel_rate;

	uint_fixed_16_16_t downscale_amount;



	/* Shouldn't reach here on disabled planes... */

	if (WARN_ON(!intel_wm_plane_visible(cstate, pstate)))
@@ -4205,10 +4207,8 @@ static uint32_t skl_adjusted_plane_pixel_rate(const struct intel_crtc_state *cst 
	adjusted_pixel_rate = cstate->pixel_rate;

	downscale_amount = skl_plane_downscale_amount(cstate, pstate);



	pixel_rate = adjusted_pixel_rate * downscale_amount >> 16;

	WARN_ON(pixel_rate != clamp_t(uint32_t, pixel_rate, 0, ~0));



	return pixel_rate;

	return mul_round_up_u32_fixed16(adjusted_pixel_rate,

					    downscale_amount);

}



static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,

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