linux-kernel - Re: [PATCH] drm/arm/malidp: Disable pixel alpha blending for colors that do not have alpha

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Message-ID: <201801151445.QDN2IhNX%fengguang.wu@intel.com>
Date:   Mon, 15 Jan 2018 14:29:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ayan Halder <ayan.halder@....com>
Cc:     kbuild-all@...org, liviu.dudau@....com, brian.starkey@....com,
        malidp@...s.arm.com, airlied@...ux.ie,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Ayan Halder <ayan.halder@....com>, nd@....com
Subject: Re: [PATCH] drm/arm/malidp: Disable pixel alpha blending for colors
 that do not have alpha

Hi Ayan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on v4.15-rc8 next-20180112]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ayan-Halder/drm-arm-malidp-Disable-pixel-alpha-blending-for-colors-that-do-not-have-alpha/20180115-080603
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/arm/malidp_planes.c: In function 'malidp_de_plane_update':
>> drivers/gpu/drm/arm/malidp_planes.c:275:42: error: 'const struct drm_format_info' has no member named 'alpha'
     u8 alpha_bits = plane->state->fb->format->alpha;
                                             ^~

vim +275 drivers/gpu/drm/arm/malidp_planes.c

   267	
   268	static void malidp_de_plane_update(struct drm_plane *plane,
   269					   struct drm_plane_state *old_state)
   270	{
   271		struct malidp_plane *mp;
   272		struct malidp_plane_state *ms = to_malidp_plane_state(plane->state);
   273		u32 src_w, src_h, dest_w, dest_h, val;
   274		int i;
 > 275		u8 alpha_bits = plane->state->fb->format->alpha;
   276	
   277		mp = to_malidp_plane(plane);
   278	
   279		/* convert src values from Q16 fixed point to integer */
   280		src_w = plane->state->src_w >> 16;
   281		src_h = plane->state->src_h >> 16;
   282		dest_w = plane->state->crtc_w;
   283		dest_h = plane->state->crtc_h;
   284	
   285		malidp_hw_write(mp->hwdev, ms->format, mp->layer->base);
   286	
   287		for (i = 0; i < ms->n_planes; i++) {
   288			/* calculate the offset for the layer's plane registers */
   289			u16 ptr = mp->layer->ptr + (i << 4);
   290			dma_addr_t fb_addr = drm_fb_cma_get_gem_addr(plane->state->fb,
   291								     plane->state, i);
   292	
   293			malidp_hw_write(mp->hwdev, lower_32_bits(fb_addr), ptr);
   294			malidp_hw_write(mp->hwdev, upper_32_bits(fb_addr), ptr + 4);
   295		}
   296		malidp_de_set_plane_pitches(mp, ms->n_planes,
   297					    plane->state->fb->pitches);
   298	
   299		malidp_hw_write(mp->hwdev, LAYER_H_VAL(src_w) | LAYER_V_VAL(src_h),
   300				mp->layer->base + MALIDP_LAYER_SIZE);
   301	
   302		malidp_hw_write(mp->hwdev, LAYER_H_VAL(dest_w) | LAYER_V_VAL(dest_h),
   303				mp->layer->base + MALIDP_LAYER_COMP_SIZE);
   304	
   305		malidp_hw_write(mp->hwdev, LAYER_H_VAL(plane->state->crtc_x) |
   306				LAYER_V_VAL(plane->state->crtc_y),
   307				mp->layer->base + MALIDP_LAYER_OFFSET);
   308	
   309		if (mp->layer->id == DE_SMART)
   310			malidp_hw_write(mp->hwdev,
   311					LAYER_H_VAL(src_w) | LAYER_V_VAL(src_h),
   312					mp->layer->base + MALIDP550_LS_R1_IN_SIZE);
   313	
   314		/* first clear the rotation bits */
   315		val = malidp_hw_read(mp->hwdev, mp->layer->base + MALIDP_LAYER_CONTROL);
   316		val &= ~LAYER_ROT_MASK;
   317	
   318		/* setup the rotation and axis flip bits */
   319		if (plane->state->rotation & DRM_MODE_ROTATE_MASK)
   320			val |= ilog2(plane->state->rotation & DRM_MODE_ROTATE_MASK) <<
   321			       LAYER_ROT_OFFSET;
   322		if (plane->state->rotation & DRM_MODE_REFLECT_X)
   323			val |= LAYER_H_FLIP;
   324		if (plane->state->rotation & DRM_MODE_REFLECT_Y)
   325			val |= LAYER_V_FLIP;
   326	
   327		val &= ~LAYER_COMP_MASK;
   328		if (alpha_bits > 0) {
   329	
   330			/*
   331			 * always enable pixel alpha blending until we have a way to change
   332			 * blend modes
   333			 */
   334			val |= LAYER_COMP_PIXEL;
   335		} else {
   336	
   337			/*
   338			 * do not enable pixel alpha blending as the color channel does not
   339			 * have any alpha information
   340			 */
   341			val |= LAYER_COMP_PLANE;
   342	
   343			/* Set layer alpha coefficient to 0xff ie fully opaque */
   344			val |= LAYER_ALPHA(0xff);
   345		}
   346	
   347		val &= ~LAYER_FLOWCFG(LAYER_FLOWCFG_MASK);
   348		if (plane->state->crtc) {
   349			struct malidp_crtc_state *m =
   350				to_malidp_crtc_state(plane->state->crtc->state);
   351	
   352			if (m->scaler_config.scale_enable &&
   353			    m->scaler_config.plane_src_id == mp->layer->id)
   354				val |= LAYER_FLOWCFG(LAYER_FLOWCFG_SCALE_SE);
   355		}
   356	
   357		/* set the 'enable layer' bit */
   358		val |= LAYER_ENABLE;
   359	
   360		malidp_hw_write(mp->hwdev, val,
   361				mp->layer->base + MALIDP_LAYER_CONTROL);
   362	}
   363	

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