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Date:   Tue, 3 Jan 2023 11:07:45 +0300
From:   Dan Carpenter <error27@gmail.com>
To:     oe-kbuild@lists.linux.dev,
        Michael Riesch <michael.riesch@wolfvision.net>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org
Cc:     lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Sandy Huang <hjc@rock-chips.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Sascha Hauer <sha@pengutronix.de>,
        Michael Riesch <michael.riesch@wolfvision.net>
Subject: Re: [PATCH 3/5] drm/rockchip: vop2: use symmetric function pair
 vop2_{create,destroy}_crtcs
Message-ID: <202301010414.gzia8KzY-lkp@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20221130140217.3196414-4-michael.riesch@wolfvision.net>
Precedence: bulk

Hi Michael,

url:    https://github.com/intel-lab-lkp/linux/commits/Michael-Riesch/drm-rockchip-vop2-add-support-for-the-rgb-output-block/20221130-220346
base:   b7b275e60bcd5f89771e865a8239325f86d9927d
patch link:    https://lore.kernel.org/r/20221130140217.3196414-4-michael.riesch%40wolfvision.net
patch subject: [PATCH 3/5] drm/rockchip: vop2: use symmetric function pair vop2_{create,destroy}_crtcs
config: parisc-randconfig-m031-20221225
compiler: hppa-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>

New smatch warnings:
drivers/gpu/drm/rockchip/rockchip_drm_vop2.c:2330 vop2_create_crtcs() error: uninitialized symbol 'possible_crtcs'.

vim +/possible_crtcs +2330 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

fb83276e59f2d6 Michael Riesch 2022-11-30  2249  static int vop2_create_crtcs(struct vop2 *vop2)
604be85547ce4d Andy Yan       2022-04-22  2250  {
604be85547ce4d Andy Yan       2022-04-22  2251  	const struct vop2_data *vop2_data = vop2->data;
604be85547ce4d Andy Yan       2022-04-22  2252  	struct drm_device *drm = vop2->drm;
604be85547ce4d Andy Yan       2022-04-22  2253  	struct device *dev = vop2->dev;
604be85547ce4d Andy Yan       2022-04-22  2254  	struct drm_plane *plane;
604be85547ce4d Andy Yan       2022-04-22  2255  	struct device_node *port;
604be85547ce4d Andy Yan       2022-04-22  2256  	struct vop2_video_port *vp;
604be85547ce4d Andy Yan       2022-04-22  2257  	int i, nvp, nvps = 0;
604be85547ce4d Andy Yan       2022-04-22  2258  	int ret;
604be85547ce4d Andy Yan       2022-04-22  2259  
604be85547ce4d Andy Yan       2022-04-22  2260  	for (i = 0; i < vop2_data->nr_vps; i++) {
604be85547ce4d Andy Yan       2022-04-22  2261  		const struct vop2_video_port_data *vp_data;
604be85547ce4d Andy Yan       2022-04-22  2262  		struct device_node *np;
604be85547ce4d Andy Yan       2022-04-22  2263  		char dclk_name[9];
604be85547ce4d Andy Yan       2022-04-22  2264  
604be85547ce4d Andy Yan       2022-04-22  2265  		vp_data = &vop2_data->vp[i];
604be85547ce4d Andy Yan       2022-04-22  2266  		vp = &vop2->vps[i];
604be85547ce4d Andy Yan       2022-04-22  2267  		vp->vop2 = vop2;
604be85547ce4d Andy Yan       2022-04-22  2268  		vp->id = vp_data->id;
604be85547ce4d Andy Yan       2022-04-22  2269  		vp->regs = vp_data->regs;
604be85547ce4d Andy Yan       2022-04-22  2270  		vp->data = vp_data;
604be85547ce4d Andy Yan       2022-04-22  2271  
604be85547ce4d Andy Yan       2022-04-22  2272  		snprintf(dclk_name, sizeof(dclk_name), "dclk_vp%d", vp->id);
604be85547ce4d Andy Yan       2022-04-22  2273  		vp->dclk = devm_clk_get(vop2->dev, dclk_name);
604be85547ce4d Andy Yan       2022-04-22  2274  		if (IS_ERR(vp->dclk)) {
604be85547ce4d Andy Yan       2022-04-22  2275  			drm_err(vop2->drm, "failed to get %s\n", dclk_name);
604be85547ce4d Andy Yan       2022-04-22  2276  			return PTR_ERR(vp->dclk);
604be85547ce4d Andy Yan       2022-04-22  2277  		}
604be85547ce4d Andy Yan       2022-04-22  2278  
604be85547ce4d Andy Yan       2022-04-22  2279  		np = of_graph_get_remote_node(dev->of_node, i, -1);
604be85547ce4d Andy Yan       2022-04-22  2280  		if (!np) {
604be85547ce4d Andy Yan       2022-04-22  2281  			drm_dbg(vop2->drm, "%s: No remote for vp%d\n", __func__, i);
604be85547ce4d Andy Yan       2022-04-22  2282  			continue;
604be85547ce4d Andy Yan       2022-04-22  2283  		}
604be85547ce4d Andy Yan       2022-04-22  2284  		of_node_put(np);
604be85547ce4d Andy Yan       2022-04-22  2285  
604be85547ce4d Andy Yan       2022-04-22  2286  		port = of_graph_get_port_by_id(dev->of_node, i);
604be85547ce4d Andy Yan       2022-04-22  2287  		if (!port) {
604be85547ce4d Andy Yan       2022-04-22  2288  			drm_err(vop2->drm, "no port node found for video_port%d\n", i);
604be85547ce4d Andy Yan       2022-04-22  2289  			return -ENOENT;
604be85547ce4d Andy Yan       2022-04-22  2290  		}
604be85547ce4d Andy Yan       2022-04-22  2291  
604be85547ce4d Andy Yan       2022-04-22  2292  		vp->crtc.port = port;
604be85547ce4d Andy Yan       2022-04-22  2293  		nvps++;
604be85547ce4d Andy Yan       2022-04-22  2294  	}
604be85547ce4d Andy Yan       2022-04-22  2295  
604be85547ce4d Andy Yan       2022-04-22  2296  	nvp = 0;
604be85547ce4d Andy Yan       2022-04-22  2297  	for (i = 0; i < vop2->registered_num_wins; i++) {
604be85547ce4d Andy Yan       2022-04-22  2298  		struct vop2_win *win = &vop2->win[i];
604be85547ce4d Andy Yan       2022-04-22  2299  		u32 possible_crtcs;
604be85547ce4d Andy Yan       2022-04-22  2300  
604be85547ce4d Andy Yan       2022-04-22  2301  		if (vop2->data->soc_id == 3566) {
604be85547ce4d Andy Yan       2022-04-22  2302  			/*
604be85547ce4d Andy Yan       2022-04-22  2303  			 * On RK3566 these windows don't have an independent
604be85547ce4d Andy Yan       2022-04-22  2304  			 * framebuffer. They share the framebuffer with smart0,
604be85547ce4d Andy Yan       2022-04-22  2305  			 * esmart0 and cluster0 respectively.
604be85547ce4d Andy Yan       2022-04-22  2306  			 */
604be85547ce4d Andy Yan       2022-04-22  2307  			switch (win->data->phys_id) {
604be85547ce4d Andy Yan       2022-04-22  2308  			case ROCKCHIP_VOP2_SMART1:
604be85547ce4d Andy Yan       2022-04-22  2309  			case ROCKCHIP_VOP2_ESMART1:
604be85547ce4d Andy Yan       2022-04-22  2310  			case ROCKCHIP_VOP2_CLUSTER1:
604be85547ce4d Andy Yan       2022-04-22  2311  				continue;
604be85547ce4d Andy Yan       2022-04-22  2312  			}
604be85547ce4d Andy Yan       2022-04-22  2313  		}
604be85547ce4d Andy Yan       2022-04-22  2314  
604be85547ce4d Andy Yan       2022-04-22  2315  		if (win->type == DRM_PLANE_TYPE_PRIMARY) {
604be85547ce4d Andy Yan       2022-04-22  2316  			vp = find_vp_without_primary(vop2);
604be85547ce4d Andy Yan       2022-04-22  2317  			if (vp) {
604be85547ce4d Andy Yan       2022-04-22  2318  				possible_crtcs = BIT(nvp);
604be85547ce4d Andy Yan       2022-04-22  2319  				vp->primary_plane = win;
604be85547ce4d Andy Yan       2022-04-22  2320  				nvp++;
604be85547ce4d Andy Yan       2022-04-22  2321  			} else {
604be85547ce4d Andy Yan       2022-04-22  2322  				/* change the unused primary window to overlay window */
604be85547ce4d Andy Yan       2022-04-22  2323  				win->type = DRM_PLANE_TYPE_OVERLAY;
604be85547ce4d Andy Yan       2022-04-22  2324  			}
604be85547ce4d Andy Yan       2022-04-22  2325  		}
604be85547ce4d Andy Yan       2022-04-22  2326  
604be85547ce4d Andy Yan       2022-04-22  2327  		if (win->type == DRM_PLANE_TYPE_OVERLAY)
604be85547ce4d Andy Yan       2022-04-22  2328  			possible_crtcs = (1 << nvps) - 1;

What about if win->type is not equal to either DRM_PLANE_TYPE_PRIMARY or
DRM_PLANE_TYPE_OVERLAY?  That's what the checker is worried about.

604be85547ce4d Andy Yan       2022-04-22  2329  
604be85547ce4d Andy Yan       2022-04-22 @2330  		ret = vop2_plane_init(vop2, win, possible_crtcs);
                                                                                                 ^^^^^^^^^^^^^^

604be85547ce4d Andy Yan       2022-04-22  2331  		if (ret) {
604be85547ce4d Andy Yan       2022-04-22  2332  			drm_err(vop2->drm, "failed to init plane %s: %d\n",
604be85547ce4d Andy Yan       2022-04-22  2333  				win->data->name, ret);
604be85547ce4d Andy Yan       2022-04-22  2334  			return ret;
604be85547ce4d Andy Yan       2022-04-22  2335  		}
604be85547ce4d Andy Yan       2022-04-22  2336  	}
604be85547ce4d Andy Yan       2022-04-22  2337  
604be85547ce4d Andy Yan       2022-04-22  2338  	for (i = 0; i < vop2_data->nr_vps; i++) {

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