1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * Copyright (c) 2010-2013 The Linux Foundation. All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <sys/mman.h>
19
20#include <cutils/log.h>
21#include <cutils/properties.h>
22#include <dlfcn.h>
23
24#include <hardware/hardware.h>
25
26#include <fcntl.h>
27#include <errno.h>
28#include <sys/ioctl.h>
29#include <string.h>
30#include <stdlib.h>
31#include <pthread.h>
32#include <cutils/atomic.h>
33
34#include <linux/fb.h>
35#include <linux/msm_mdp.h>
36
37#include <GLES/gl.h>
38
39#include "gralloc_priv.h"
40#include "fb_priv.h"
41#include "gr.h"
42#include <cutils/properties.h>
43#include <profiler.h>
44
45#define EVEN_OUT(x) if (x & 0x0001) {x--;}
46/** min of int a, b */
47static inline int min(int a, int b) {
48    return (a<b) ? a : b;
49}
50/** max of int a, b */
51static inline int max(int a, int b) {
52    return (a>b) ? a : b;
53}
54
55enum {
56    PAGE_FLIP = 0x00000001,
57};
58
59struct fb_context_t {
60    framebuffer_device_t  device;
61};
62
63
64static int fb_setSwapInterval(struct framebuffer_device_t* dev,
65                              int interval)
66{
67    //XXX: Get the value here and implement along with
68    //single vsync in HWC
69    char pval[PROPERTY_VALUE_MAX];
70    property_get("debug.egl.swapinterval", pval, "-1");
71    int property_interval = atoi(pval);
72    if (property_interval >= 0)
73        interval = property_interval;
74
75    private_module_t* m = reinterpret_cast<private_module_t*>(
76        dev->common.module);
77    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
78        return -EINVAL;
79
80    m->swapInterval = interval;
81    return 0;
82}
83
84static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
85{
86    private_module_t* m =
87        reinterpret_cast<private_module_t*>(dev->common.module);
88    private_handle_t *hnd = static_cast<private_handle_t*>
89        (const_cast<native_handle_t*>(buffer));
90    const size_t offset = hnd->base - m->framebuffer->base;
91    m->info.activate = FB_ACTIVATE_VBL;
92    m->info.yoffset = offset / m->finfo.line_length;
93    if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
94        ALOGE("%s: FBIOPUT_VSCREENINFO for primary failed, str: %s",
95                __FUNCTION__, strerror(errno));
96        return -errno;
97    }
98    return 0;
99}
100
101static int fb_compositionComplete(struct framebuffer_device_t* dev)
102{
103    // TODO: Properly implement composition complete callback
104    glFinish();
105
106    return 0;
107}
108
109int mapFrameBufferLocked(struct private_module_t* module)
110{
111    // already initialized...
112    if (module->framebuffer) {
113        return 0;
114    }
115    char const * const device_template[] = {
116        "/dev/graphics/fb%u",
117        "/dev/fb%u",
118        0 };
119
120    int fd = -1;
121    int i=0;
122    char name[64];
123    char property[PROPERTY_VALUE_MAX];
124
125    while ((fd==-1) && device_template[i]) {
126        snprintf(name, 64, device_template[i], 0);
127        fd = open(name, O_RDWR, 0);
128        i++;
129    }
130    if (fd < 0)
131        return -errno;
132
133    memset(&module->commit, 0, sizeof(struct mdp_display_commit));
134
135    struct fb_fix_screeninfo finfo;
136    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
137        return -errno;
138
139    struct fb_var_screeninfo info;
140    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
141        return -errno;
142
143    info.reserved[0] = 0;
144    info.reserved[1] = 0;
145    info.reserved[2] = 0;
146    info.xoffset = 0;
147    info.yoffset = 0;
148    info.activate = FB_ACTIVATE_NOW;
149
150    /* Interpretation of offset for color fields: All offsets are from the
151     * right, inside a "pixel" value, which is exactly 'bits_per_pixel' wide
152     * (means: you can use the offset as right argument to <<). A pixel
153     * afterwards is a bit stream and is written to video memory as that
154     * unmodified. This implies big-endian byte order if bits_per_pixel is
155     * greater than 8.
156     */
157
158    if(info.bits_per_pixel == 32) {
159        /*
160         * Explicitly request RGBA_8888
161         */
162        info.bits_per_pixel = 32;
163        info.red.offset     = 24;
164        info.red.length     = 8;
165        info.green.offset   = 16;
166        info.green.length   = 8;
167        info.blue.offset    = 8;
168        info.blue.length    = 8;
169        info.transp.offset  = 0;
170        info.transp.length  = 8;
171
172        /* Note: the GL driver does not have a r=8 g=8 b=8 a=0 config, so if we
173         * do not use the MDP for composition (i.e. hw composition == 0), ask
174         * for RGBA instead of RGBX. */
175        if (property_get("debug.sf.hw", property, NULL) > 0 &&
176                                                           atoi(property) == 0)
177            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
178        else if(property_get("debug.composition.type", property, NULL) > 0 &&
179                (strncmp(property, "mdp", 3) == 0))
180            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
181        else
182            module->fbFormat = HAL_PIXEL_FORMAT_RGBA_8888;
183    } else {
184        /*
185         * Explicitly request 5/6/5
186         */
187        info.bits_per_pixel = 16;
188        info.red.offset     = 11;
189        info.red.length     = 5;
190        info.green.offset   = 5;
191        info.green.length   = 6;
192        info.blue.offset    = 0;
193        info.blue.length    = 5;
194        info.transp.offset  = 0;
195        info.transp.length  = 0;
196        module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
197    }
198
199    //adreno needs 4k aligned offsets. Max hole size is 4096-1
200    int  size = roundUpToPageSize(info.yres * info.xres *
201                                                       (info.bits_per_pixel/8));
202
203    /*
204     * Request NUM_BUFFERS screens (at least 2 for page flipping)
205     */
206    int numberOfBuffers = (int)(finfo.smem_len/size);
207    ALOGV("num supported framebuffers in kernel = %d", numberOfBuffers);
208
209    if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
210        int num = atoi(property);
211        if ((num >= NUM_FRAMEBUFFERS_MIN) && (num <= NUM_FRAMEBUFFERS_MAX)) {
212            numberOfBuffers = num;
213        }
214    }
215    if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
216        numberOfBuffers = NUM_FRAMEBUFFERS_MAX;
217
218    ALOGV("We support %d buffers", numberOfBuffers);
219
220    //consider the included hole by 4k alignment
221    uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
222    info.yres_virtual = (size * numberOfBuffers) / line_length;
223
224    uint32_t flags = PAGE_FLIP;
225
226    if (info.yres_virtual < ((size * 2) / line_length) ) {
227        // we need at least 2 for page-flipping
228        info.yres_virtual = size / line_length;
229        flags &= ~PAGE_FLIP;
230        ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
231              info.yres_virtual, info.yres*2);
232    }
233
234    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
235        return -errno;
236
237    if (int(info.width) <= 0 || int(info.height) <= 0) {
238        // the driver doesn't return that information
239        // default to 160 dpi
240        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
241        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
242    }
243
244    float xdpi = (info.xres * 25.4f) / info.width;
245    float ydpi = (info.yres * 25.4f) / info.height;
246#ifdef MSMFB_METADATA_GET
247    struct msmfb_metadata metadata;
248    memset(&metadata, 0 , sizeof(metadata));
249    metadata.op = metadata_op_frame_rate;
250    if (ioctl(fd, MSMFB_METADATA_GET, &metadata) == -1) {
251        ALOGE("Error retrieving panel frame rate");
252        return -errno;
253    }
254    float fps  = metadata.data.panel_frame_rate;
255#else
256    //XXX: Remove reserved field usage on all baselines
257    //The reserved[3] field is used to store FPS by the driver.
258    float fps  = info.reserved[3] & 0xFF;
259#endif
260    ALOGI("using (fd=%d)\n"
261          "id           = %s\n"
262          "xres         = %d px\n"
263          "yres         = %d px\n"
264          "xres_virtual = %d px\n"
265          "yres_virtual = %d px\n"
266          "bpp          = %d\n"
267          "r            = %2u:%u\n"
268          "g            = %2u:%u\n"
269          "b            = %2u:%u\n",
270          fd,
271          finfo.id,
272          info.xres,
273          info.yres,
274          info.xres_virtual,
275          info.yres_virtual,
276          info.bits_per_pixel,
277          info.red.offset, info.red.length,
278          info.green.offset, info.green.length,
279          info.blue.offset, info.blue.length
280         );
281
282    ALOGI("width        = %d mm (%f dpi)\n"
283          "height       = %d mm (%f dpi)\n"
284          "refresh rate = %.2f Hz\n",
285          info.width,  xdpi,
286          info.height, ydpi,
287          fps
288         );
289
290
291    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
292        return -errno;
293
294    if (finfo.smem_len <= 0)
295        return -errno;
296
297    module->flags = flags;
298    module->info = info;
299    module->finfo = finfo;
300    module->xdpi = xdpi;
301    module->ydpi = ydpi;
302    module->fps = fps;
303    module->swapInterval = 1;
304
305    CALC_INIT();
306
307    /*
308     * map the framebuffer
309     */
310
311    module->numBuffers = info.yres_virtual / info.yres;
312    module->bufferMask = 0;
313    //adreno needs page aligned offsets. Align the fbsize to pagesize.
314    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres)*
315                    module->numBuffers;
316    module->framebuffer = new private_handle_t(fd, fbSize,
317                                        private_handle_t::PRIV_FLAGS_USES_ION,
318                                        BUFFER_TYPE_UI,
319                                        module->fbFormat, info.xres, info.yres);
320    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
321    if (vaddr == MAP_FAILED) {
322        ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
323        return -errno;
324    }
325    module->framebuffer->base = intptr_t(vaddr);
326    memset(vaddr, 0, fbSize);
327    module->currentOffset = 0;
328    //Enable vsync
329    int enable = 1;
330    ioctl(module->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL,
331             &enable);
332    return 0;
333}
334
335static int mapFrameBuffer(struct private_module_t* module)
336{
337    pthread_mutex_lock(&module->lock);
338    int err = mapFrameBufferLocked(module);
339    pthread_mutex_unlock(&module->lock);
340    return err;
341}
342
343/*****************************************************************************/
344
345static int fb_close(struct hw_device_t *dev)
346{
347    fb_context_t* ctx = (fb_context_t*)dev;
348    if (ctx) {
349        free(ctx);
350    }
351    return 0;
352}
353
354int fb_device_open(hw_module_t const* module, const char* name,
355                   hw_device_t** device)
356{
357    int status = -EINVAL;
358    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
359        alloc_device_t* gralloc_device;
360        status = gralloc_open(module, &gralloc_device);
361        if (status < 0)
362            return status;
363
364        /* initialize our state here */
365        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
366        memset(dev, 0, sizeof(*dev));
367
368        /* initialize the procs */
369        dev->device.common.tag      = HARDWARE_DEVICE_TAG;
370        dev->device.common.version  = 0;
371        dev->device.common.module   = const_cast<hw_module_t*>(module);
372        dev->device.common.close    = fb_close;
373        dev->device.setSwapInterval = fb_setSwapInterval;
374        dev->device.post            = fb_post;
375        dev->device.setUpdateRect   = 0;
376        dev->device.compositionComplete = fb_compositionComplete;
377
378        private_module_t* m = (private_module_t*)module;
379        status = mapFrameBuffer(m);
380        if (status >= 0) {
381            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
382            const_cast<uint32_t&>(dev->device.flags) = 0;
383            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
384            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
385            const_cast<int&>(dev->device.stride) = stride;
386            const_cast<int&>(dev->device.format) = m->fbFormat;
387            const_cast<float&>(dev->device.xdpi) = m->xdpi;
388            const_cast<float&>(dev->device.ydpi) = m->ydpi;
389            const_cast<float&>(dev->device.fps) = m->fps;
390            const_cast<int&>(dev->device.minSwapInterval) =
391                                                        PRIV_MIN_SWAP_INTERVAL;
392            const_cast<int&>(dev->device.maxSwapInterval) =
393                                                        PRIV_MAX_SWAP_INTERVAL;
394            const_cast<int&>(dev->device.numFramebuffers) = m->numBuffers;
395            dev->device.setUpdateRect = 0;
396
397            *device = &dev->device.common;
398        }
399
400        // Close the gralloc module
401        gralloc_close(gralloc_device);
402    }
403    return status;
404}
405