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Date:   Fri, 12 Apr 2019 16:55:49 +0100
From:   Liviu Dudau <Liviu.Dudau@....com>
To:     Ben Davis <Ben.Davis@....com>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        nd <nd@....com>, Brian Starkey <Brian.Starkey@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "sean@...rly.run" <sean@...rly.run>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] drm/malidp: Enable writeback scaling

Hi Ben,

On Fri, Apr 12, 2019 at 03:08:32PM +0100, Ben Davis wrote:
> The phase setting part of malidp_crtc_atomic_check_scaling is refactored
> to allow use in writeback scaling.
> 
> Also the enable_memwrite function prototype is simplified by directly
> passing mw_state.
> 
> Signed-off-by: Ben Davis <ben.davis@....com>
> ---
>  drivers/gpu/drm/arm/malidp_crtc.c | 49 ++++++++++++----------
>  drivers/gpu/drm/arm/malidp_crtc.h | 12 ++++++
>  drivers/gpu/drm/arm/malidp_drv.c  | 10 +++--
>  drivers/gpu/drm/arm/malidp_hw.c   | 45 ++++++++++++++------
>  drivers/gpu/drm/arm/malidp_hw.h   | 19 +++++++--
>  drivers/gpu/drm/arm/malidp_mw.c   | 86 ++++++++++++++++++++++++++++++---------
>  drivers/gpu/drm/arm/malidp_regs.h |  1 +
>  7 files changed, 161 insertions(+), 61 deletions(-)
>  create mode 100644 drivers/gpu/drm/arm/malidp_crtc.h
> 
> diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
> index 3f65996..aa66457 100644
> --- a/drivers/gpu/drm/arm/malidp_crtc.c
> +++ b/drivers/gpu/drm/arm/malidp_crtc.c
> @@ -265,6 +265,31 @@ static int malidp_crtc_atomic_check_ctm(struct drm_crtc *crtc,
>  	return 0;
>  }
>  
> +void malidp_set_se_config_phase(struct malidp_se_config *s)
> +{
> +#define SE_N_PHASE 4
> +#define SE_SHIFT_N_PHASE 12
> +	u32 phase;
> +
> +	/* Calculate initial_phase and delta_phase for horizontal. */
> +	phase = s->input_w;
> +	s->h_init_phase = ((phase << SE_N_PHASE) / s->output_w + 1) / 2;
> +
> +	phase = s->input_w;
> +	phase <<= (SE_SHIFT_N_PHASE + SE_N_PHASE);
> +	s->h_delta_phase = phase / s->output_w;
> +
> +	/* Same for vertical. */
> +	phase = s->input_h;
> +	s->v_init_phase = ((phase << SE_N_PHASE) / s->output_h + 1) / 2;
> +
> +	phase = s->input_h;
> +	phase <<= (SE_SHIFT_N_PHASE + SE_N_PHASE);
> +	s->v_delta_phase = phase / s->output_h;
> +#undef SE_N_PHASE
> +#undef SE_SHIFT_N_PHASE
> +}
> +
>  static int malidp_crtc_atomic_check_scaling(struct drm_crtc *crtc,
>  					    struct drm_crtc_state *state)
>  {
> @@ -291,7 +316,6 @@ static int malidp_crtc_atomic_check_scaling(struct drm_crtc *crtc,
>  
>  	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
>  		struct malidp_plane *mp = to_malidp_plane(plane);
> -		u32 phase;
>  
>  		if (!(mp->layer->id & scaling))
>  			continue;
> @@ -319,27 +343,8 @@ static int malidp_crtc_atomic_check_scaling(struct drm_crtc *crtc,
>  		s->output_w = pstate->crtc_w;
>  		s->output_h = pstate->crtc_h;
>  
> -#define SE_N_PHASE 4
> -#define SE_SHIFT_N_PHASE 12
> -		/* Calculate initial_phase and delta_phase for horizontal. */
> -		phase = s->input_w;
> -		s->h_init_phase =
> -				((phase << SE_N_PHASE) / s->output_w + 1) / 2;
> -
> -		phase = s->input_w;
> -		phase <<= (SE_SHIFT_N_PHASE + SE_N_PHASE);
> -		s->h_delta_phase = phase / s->output_w;
> -
> -		/* Same for vertical. */
> -		phase = s->input_h;
> -		s->v_init_phase =
> -				((phase << SE_N_PHASE) / s->output_h + 1) / 2;
> -
> -		phase = s->input_h;
> -		phase <<= (SE_SHIFT_N_PHASE + SE_N_PHASE);
> -		s->v_delta_phase = phase / s->output_h;
> -#undef SE_N_PHASE
> -#undef SE_SHIFT_N_PHASE
> +
> +		malidp_set_se_config_phase(s);
>  		s->plane_src_id = mp->layer->id;
>  	}
>  
> diff --git a/drivers/gpu/drm/arm/malidp_crtc.h b/drivers/gpu/drm/arm/malidp_crtc.h
> new file mode 100644
> index 0000000..0f056f8
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/malidp_crtc.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
> + *
> + */
> +
> +#include "malidp_hw.h"
> +
> +#ifndef __MALIDP_CRTC_H__
> +#define __MALIDP_CRTC_H__
> +void malidp_set_se_config_phase(struct malidp_se_config *s);
> +#endif
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index d37ff9d..e2465e9 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -138,7 +138,7 @@ static void malidp_atomic_commit_se_config(struct drm_crtc *crtc,
>  	u32 val;
>  
>  	/* Set SE_CONTROL */
> -	if (!s->scale_enable) {
> +	if (!s->scale_enable && !s->wb_scale_enable) {
>  		val = malidp_hw_read(hwdev, se_control);
>  		val &= ~MALIDP_SE_SCALING_EN;
>  		malidp_hw_write(hwdev, val, se_control);
> @@ -147,12 +147,16 @@ static void malidp_atomic_commit_se_config(struct drm_crtc *crtc,
>  
>  	hwdev->hw->se_set_scaling_coeffs(hwdev, s, old_s);
>  	val = malidp_hw_read(hwdev, se_control);
> -	val |= MALIDP_SE_SCALING_EN | MALIDP_SE_ALPHA_EN;
> +	val |= MALIDP_SE_SCALING_EN;
>  
>  	val &= ~MALIDP_SE_ENH(MALIDP_SE_ENH_MASK);
>  	val |= s->enhancer_enable ? MALIDP_SE_ENH(3) : 0;
>  
> -	val |= MALIDP_SE_RGBO_IF_EN;
> +	if (s->scale_enable)
> +		val |= (MALIDP_SE_RGBO_IF_EN | MALIDP_SE_ALPHA_EN);
> +	else
> +		val &= ~((MALIDP_SE_RGBO_IF_EN | MALIDP_SE_ALPHA_EN));
> +
>  	malidp_hw_write(hwdev, val, se_control);
>  
>  	/* Set IN_SIZE & OUT_SIZE. */
> diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
> index 1a36718..6f59c0e 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.c
> +++ b/drivers/gpu/drm/arm/malidp_hw.c
> @@ -497,13 +497,18 @@ static long malidp500_se_calc_mclk(struct malidp_hw_device *hwdev,
>  	return ret;
>  }
>  
> -static int malidp500_enable_memwrite(struct malidp_hw_device *hwdev,
> -				     dma_addr_t *addrs, s32 *pitches,
> -				     int num_planes, u16 w, u16 h, u32 fmt_id,
> -				     const s16 *rgb2yuv_coeffs)
> +static int malidp500_enable_memwrite(struct malidp_hw_device *hwdev, u16 w, u16 h,
> +				     struct malidp_mw_connector_state *mw_state)
>  {
> +
> +	int num_planes = mw_state->n_planes;
> +	dma_addr_t *addrs = mw_state->addrs;
> +	s32 *pitches = mw_state->pitches;
> +	u32 fmt_id = mw_state->format;
>  	u32 base = MALIDP500_SE_MEMWRITE_BASE;
>  	u32 de_base = malidp_get_block_base(hwdev, MALIDP_DE_BLOCK);
> +	const s16 *rgb2yuv_coeffs = !mw_state->rgb2yuv_initialized ?
> +					mw_state->rgb2yuv_coeffs : NULL;
>  
>  	/* enable the scaling engine block */
>  	malidp_hw_setbits(hwdev, MALIDP_SCALE_ENGINE_EN, de_base + MALIDP_DE_DISPLAY_FUNC);
> @@ -847,13 +852,18 @@ static long malidp550_se_calc_mclk(struct malidp_hw_device *hwdev,
>  	return ret;
>  }
>  
> -static int malidp550_enable_memwrite(struct malidp_hw_device *hwdev,
> -				     dma_addr_t *addrs, s32 *pitches,
> -				     int num_planes, u16 w, u16 h, u32 fmt_id,
> -				     const s16 *rgb2yuv_coeffs)
> +static int malidp550_enable_memwrite(struct malidp_hw_device *hwdev, u16 w, u16 h,
> +				     struct malidp_mw_connector_state *mw_state)
>  {
> +	int num_planes = mw_state->n_planes;
> +	bool scaling = mw_state->wb_scale_enable;
> +	dma_addr_t *addrs = mw_state->addrs;
> +	s32 *pitches = mw_state->pitches;
> +	u32 fmt_id = mw_state->format;
>  	u32 base = MALIDP550_SE_MEMWRITE_BASE;
>  	u32 de_base = malidp_get_block_base(hwdev, MALIDP_DE_BLOCK);
> +	const s16 *rgb2yuv_coeffs = !mw_state->rgb2yuv_initialized ?
> +					mw_state->rgb2yuv_coeffs : NULL;
>  
>  	/* enable the scaling engine block */
>  	malidp_hw_setbits(hwdev, MALIDP_SCALE_ENGINE_EN, de_base + MALIDP_DE_DISPLAY_FUNC);
> @@ -876,10 +886,18 @@ static int malidp550_enable_memwrite(struct malidp_hw_device *hwdev,
>  		WARN(1, "Invalid number of planes");
>  	}
>  
> -	malidp_hw_write(hwdev, MALIDP_DE_H_ACTIVE(w) | MALIDP_DE_V_ACTIVE(h),
> -			MALIDP550_SE_MEMWRITE_OUT_SIZE);
> -	malidp_hw_setbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN,
> -			  MALIDP550_SE_CONTROL);
> +	malidp_hw_clearbits(hwdev, MALIDP_SE_MEMWRITE_EN | MALIDP_SE_MEMWRITE_SCL_EN,
> +			    MALIDP550_SE_CONTROL);
> +
> +	if (scaling) {
> +		malidp_hw_setbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_SCL_EN,
> +				  MALIDP550_SE_CONTROL);
> +	} else {
> +		malidp_hw_write(hwdev, MALIDP_DE_H_ACTIVE(w) | MALIDP_DE_V_ACTIVE(h),
> +				MALIDP550_SE_MEMWRITE_OUT_SIZE);
> +		malidp_hw_setbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN,
> +				  MALIDP550_SE_CONTROL);
> +	}
>  
>  	if (rgb2yuv_coeffs) {
>  		int i;
> @@ -897,7 +915,8 @@ static void malidp550_disable_memwrite(struct malidp_hw_device *hwdev)
>  {
>  	u32 base = malidp_get_block_base(hwdev, MALIDP_DE_BLOCK);
>  
> -	malidp_hw_clearbits(hwdev, MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN,
> +	malidp_hw_clearbits(hwdev,
> +			    MALIDP550_SE_MEMWRITE_ONESHOT | MALIDP_SE_MEMWRITE_EN | MALIDP_SE_MEMWRITE_SCL_EN,
>  			    MALIDP550_SE_CONTROL);
>  	malidp_hw_clearbits(hwdev, MALIDP_SCALE_ENGINE_EN, base + MALIDP_DE_DISPLAY_FUNC);
>  }
> diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
> index 8352a2e..61ddcb5 100644
> --- a/drivers/gpu/drm/arm/malidp_hw.h
> +++ b/drivers/gpu/drm/arm/malidp_hw.h
> @@ -85,6 +85,7 @@ enum malidp_scaling_coeff_set {
>  struct malidp_se_config {
>  	u8 scale_enable : 1;
>  	u8 enhancer_enable : 1;
> +	u8 wb_scale_enable : 1;
>  	u8 hcoeff : 3;
>  	u8 vcoeff : 3;
>  	u8 plane_src_id;
> @@ -94,6 +95,19 @@ struct malidp_se_config {
>  	u32 v_init_phase, v_delta_phase;
>  };
>  
> +#define to_mw_state(_state) (struct malidp_mw_connector_state *)(_state)
> +
> +struct malidp_mw_connector_state {
> +	struct drm_connector_state base;
> +	dma_addr_t addrs[2];
> +	s32 pitches[2];
> +	u8 format;
> +	u8 n_planes;
> +	bool rgb2yuv_initialized;
> +	const s16 *rgb2yuv_coeffs;
> +	bool wb_scale_enable;
> +};
> +
>  /* regmap features */
>  #define MALIDP_REGMAP_HAS_CLEARIRQ				BIT(0)
>  #define MALIDP_DEVICE_AFBC_SUPPORT_SPLIT			BIT(1)
> @@ -206,9 +220,8 @@ struct malidp_hw {
>  	 * @param h - height of the output frame
>  	 * @param fmt_id - internal format ID of output buffer
>  	 */
> -	int (*enable_memwrite)(struct malidp_hw_device *hwdev, dma_addr_t *addrs,
> -			       s32 *pitches, int num_planes, u16 w, u16 h, u32 fmt_id,
> -			       const s16 *rgb2yuv_coeffs);
> +	int (*enable_memwrite)(struct malidp_hw_device *hwdev, u16 w, u16 h,
> +			       struct malidp_mw_connector_state *mw_state);
>  
>  	/*
>  	 * Disable the writing to memory of the next frame's content.
> diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
> index 2865f7a..2120ef1 100644
> --- a/drivers/gpu/drm/arm/malidp_mw.c
> +++ b/drivers/gpu/drm/arm/malidp_mw.c
> @@ -13,23 +13,13 @@
>  #include <drm/drm_gem_cma_helper.h>
>  #include <drm/drmP.h>
>  #include <drm/drm_writeback.h>
> +#include <video/videomode.h>
>  
> +#include "malidp_crtc.h"
>  #include "malidp_drv.h"
>  #include "malidp_hw.h"
>  #include "malidp_mw.h"
>  
> -#define to_mw_state(_state) (struct malidp_mw_connector_state *)(_state)
> -
> -struct malidp_mw_connector_state {
> -	struct drm_connector_state base;
> -	dma_addr_t addrs[2];
> -	s32 pitches[2];
> -	u8 format;
> -	u8 n_planes;
> -	bool rgb2yuv_initialized;
> -	const s16 *rgb2yuv_coeffs;
> -};
> -
>  static int malidp_mw_connector_get_modes(struct drm_connector *connector)
>  {
>  	struct drm_device *dev = connector->dev;
> @@ -126,16 +116,76 @@ malidp_mw_encoder_atomic_check(struct drm_encoder *encoder,
>  			       struct drm_connector_state *conn_state)
>  {
>  	struct malidp_mw_connector_state *mw_state = to_mw_state(conn_state);
> +	struct malidp_crtc_state *cs = to_malidp_crtc_state(crtc_state);
> +	struct malidp_se_config *s = &cs->scaler_config;
>  	struct malidp_drm *malidp = encoder->dev->dev_private;
>  	struct drm_framebuffer *fb;
> -	int i, n_planes;
> +	int i, n_planes, ret;
> +	struct malidp_hw_device *hwdev = malidp->dev;
> +	struct videomode vm;
> +	u32 h_upscale_factor = 0; /* U16.16 */
> +	u32 v_upscale_factor = 0; /* U16.16 */
> +
> +	s->wb_scale_enable = 0;
>  
>  	if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
>  		return 0;
>  
> +
> +	if ((conn_state->writeback_w != crtc_state->mode.hdisplay) ||
> +	    (conn_state->writeback_h != crtc_state->mode.vdisplay)) {

Now that the default (zero) for writeback_w and writeback_h means "not
set by userspace, don't scale" I think you need to revisit this check.
Otherwise the writeback scaling gets enabled all the time.

Best regards,
Liviu


> +		s->wb_scale_enable = 1;
> +		mw_state->wb_scale_enable = true;
> +	}
> +
>  	fb = conn_state->writeback_job->fb;
> -	if ((fb->width != crtc_state->mode.hdisplay) ||
> -	    (fb->height != crtc_state->mode.vdisplay)) {
> +	if (s->wb_scale_enable) {
> +		if (s->scale_enable) {
> +			DRM_DEBUG_KMS("Attempting to scale on writeback while scaling a layer\n");
> +			return -EINVAL;
> +		}
> +
> +		s->input_w = crtc_state->mode.hdisplay;
> +		s->input_h = crtc_state->mode.vdisplay;
> +		s->output_w = conn_state->writeback_w;
> +		s->output_h = conn_state->writeback_h;
> +
> +		if (fb->width < s->output_w || fb->height < s->output_h) {
> +			DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
> +					fb->width, fb->height);
> +			return -EINVAL;
> +		}
> +
> +		if ((s->output_w > s->input_w) || (s->output_h > s->input_h)) {
> +			DRM_DEBUG_KMS("Upscaling on writeback is not supported\n");
> +			return -EINVAL;
> +		}
> +
> +		/*
> +		 * Convert crtc_[w|h] to U32.32, then divide by U16.16 src_[w|h]
> +		 * to get the U16.16 result.
> +		 */
> +		h_upscale_factor = div_u64((u64)s->output_w << 32,
> +					   (u32)s->input_w << 16);
> +		v_upscale_factor = div_u64((u64)s->output_h << 32,
> +					   (u32)s->input_h << 16);
> +
> +		/* enhancer is for upscaling */
> +		s->enhancer_enable = 0;
> +
> +		malidp_set_se_config_phase(s);
> +
> +		s->hcoeff = malidp_se_select_coeffs(h_upscale_factor);
> +		s->vcoeff = malidp_se_select_coeffs(v_upscale_factor);
> +
> +		drm_display_mode_to_videomode(&crtc_state->adjusted_mode, &vm);
> +		ret = hwdev->hw->se_calc_mclk(hwdev, s, &vm);
> +		if (ret < 0)
> +			return -EINVAL;
> +	}
> +
> +	if (!s->wb_scale_enable && ((fb->width != crtc_state->mode.hdisplay) ||
> +		       (fb->height != crtc_state->mode.vdisplay))) {
>  		DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
>  				fb->width, fb->height);
>  		return -EINVAL;
> @@ -259,11 +309,7 @@ void malidp_mw_atomic_commit(struct drm_device *drm,
>  
>  		drm_writeback_queue_job(mw_conn, conn_state->writeback_job);
>  		conn_state->writeback_job = NULL;
> -		hwdev->hw->enable_memwrite(hwdev, mw_state->addrs,
> -					   mw_state->pitches, mw_state->n_planes,
> -					   fb->width, fb->height, mw_state->format,
> -					   !mw_state->rgb2yuv_initialized ?
> -					   mw_state->rgb2yuv_coeffs : NULL);
> +		hwdev->hw->enable_memwrite(hwdev, fb->width, fb->height, mw_state);
>  		mw_state->rgb2yuv_initialized = !!mw_state->rgb2yuv_coeffs;
>  	} else {
>  		DRM_DEV_DEBUG_DRIVER(drm->dev, "Disable memwrite\n");
> diff --git a/drivers/gpu/drm/arm/malidp_regs.h b/drivers/gpu/drm/arm/malidp_regs.h
> index a3363f3..254aa98 100644
> --- a/drivers/gpu/drm/arm/malidp_regs.h
> +++ b/drivers/gpu/drm/arm/malidp_regs.h
> @@ -73,6 +73,7 @@
>  #define   MALIDP_DISP_FUNC_CADJ		(1 << 4)
>  #define   MALIDP_DISP_FUNC_ILACED	(1 << 8)
>  #define   MALIDP_SCALE_ENGINE_EN	(1 << 16)
> +#define   MALIDP_SE_MEMWRITE_SCL_EN	(1 << 5)
>  #define   MALIDP_SE_MEMWRITE_EN		(2 << 5)
>  
>  /* register offsets for IRQ management */
> -- 
> 2.7.4
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

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