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linux/drivers/gpu/drm/tiny/gm12u320.c
Thomas Zimmermann 659ab7a49c drm: Use USB controller's DMA mask when importing dmabufs 
USB devices cannot perform DMA and hence have no dma_mask set in their
device structure. Therefore importing dmabuf into a USB-based driver
fails, which breaks joining and mirroring of display in X11.

For USB devices, pick the associated USB controller as attachment device.
This allows the DRM import helpers to perform the DMA setup. If the DMA
controller does not support DMA transfers, we're out of luck and cannot
import. Our current USB-based DRM drivers don't use DMA, so the actual
DMA device is not important.

Tested by joining/mirroring displays of udl and radeon under Gnome/X11.

v8:
	* release dmadev if device initialization fails (Noralf)
	* fix commit description (Noralf)
v7:
	* fix use-before-init bug in gm12u320 (Dan)
v6:
	* implement workaround in DRM drivers and hold reference to
	  DMA device while USB device is in use
	* remove dev_is_usb() (Greg)
	* collapse USB helper into usb_intf_get_dma_device() (Alan)
	* integrate Daniel's TODO statement (Daniel)
	* fix typos (Greg)
v5:
	* provide a helper for USB interfaces (Alan)
	* add FIXME item to documentation and TODO list (Daniel)
v4:
	* implement workaround with USB helper functions (Greg)
	* use struct usb_device->bus->sysdev as DMA device (Takashi)
v3:
	* drop gem_create_object
	* use DMA mask of USB controller, if any (Daniel, Christian, Noralf)
v2:
	* move fix to importer side (Christian, Daniel)
	* update SHMEM and CMA helpers for new PRIME callbacks

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 6eb0233ec2 ("usb: don't inherity DMA properties for USB devices")
Tested-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210303133229.3288-1-tzimmermann@suse.de
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
2021-03-11 11:11:33 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2019 Hans de Goede <hdegoede@redhat.com>
*/
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_file.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
static bool eco_mode;
module_param(eco_mode, bool, 0644);
MODULE_PARM_DESC(eco_mode, "Turn on Eco mode (less bright, more silent)");
#define DRIVER_NAME "gm12u320"
#define DRIVER_DESC "Grain Media GM12U320 USB projector display"
#define DRIVER_DATE "2019"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
/*
* The DLP has an actual width of 854 pixels, but that is not a multiple
* of 8, breaking things left and right, so we export a width of 848.
*/
#define GM12U320_USER_WIDTH 848
#define GM12U320_REAL_WIDTH 854
#define GM12U320_HEIGHT 480
#define GM12U320_BLOCK_COUNT 20
#define GM12U320_ERR(fmt, ...) \
DRM_DEV_ERROR(gm12u320->dev.dev, fmt, ##__VA_ARGS__)
#define MISC_RCV_EPT 1
#define DATA_RCV_EPT 2
#define DATA_SND_EPT 3
#define MISC_SND_EPT 4
#define DATA_BLOCK_HEADER_SIZE 84
#define DATA_BLOCK_CONTENT_SIZE 64512
#define DATA_BLOCK_FOOTER_SIZE 20
#define DATA_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
DATA_BLOCK_CONTENT_SIZE + \
DATA_BLOCK_FOOTER_SIZE)
#define DATA_LAST_BLOCK_CONTENT_SIZE 4032
#define DATA_LAST_BLOCK_SIZE (DATA_BLOCK_HEADER_SIZE + \
DATA_LAST_BLOCK_CONTENT_SIZE + \
DATA_BLOCK_FOOTER_SIZE)
#define CMD_SIZE 31
#define READ_STATUS_SIZE 13
#define MISC_VALUE_SIZE 4
#define CMD_TIMEOUT msecs_to_jiffies(200)
#define DATA_TIMEOUT msecs_to_jiffies(1000)
#define IDLE_TIMEOUT msecs_to_jiffies(2000)
#define FIRST_FRAME_TIMEOUT msecs_to_jiffies(2000)
#define MISC_REQ_GET_SET_ECO_A 0xff
#define MISC_REQ_GET_SET_ECO_B 0x35
/* Windows driver does once every second, with arg d = 1, other args 0 */
#define MISC_REQ_UNKNOWN1_A 0xff
#define MISC_REQ_UNKNOWN1_B 0x38
/* Windows driver does this on init, with arg a, b = 0, c = 0xa0, d = 4 */
#define MISC_REQ_UNKNOWN2_A 0xa5
#define MISC_REQ_UNKNOWN2_B 0x00
struct gm12u320_device {
struct drm_device dev;
struct device *dmadev;
struct drm_simple_display_pipe pipe;
struct drm_connector conn;
unsigned char *cmd_buf;
unsigned char *data_buf[GM12U320_BLOCK_COUNT];
struct {
struct delayed_work work;
struct mutex lock;
struct drm_framebuffer *fb;
struct drm_rect rect;
int frame;
int draw_status_timeout;
} fb_update;
};
#define to_gm12u320(__dev) container_of(__dev, struct gm12u320_device, dev)
static const char cmd_data[CMD_SIZE] = {
0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
0x68, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x10, 0xff,
0x00, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x80, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const char cmd_draw[CMD_SIZE] = {
0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xfe,
0x00, 0x00, 0x00, 0xc0, 0xd1, 0x05, 0x00, 0x40,
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const char cmd_misc[CMD_SIZE] = {
0x55, 0x53, 0x42, 0x43, 0x00, 0x00, 0x00, 0x00,
0x04, 0x00, 0x00, 0x00, 0x80, 0x01, 0x10, 0xfd,
0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const char data_block_header[DATA_BLOCK_HEADER_SIZE] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x04, 0x15, 0x00, 0x00, 0xfc, 0x00, 0x00,
0x01, 0x00, 0x00, 0xdb
};
static const char data_last_block_header[DATA_BLOCK_HEADER_SIZE] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xfb, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x2a, 0x00, 0x20, 0x00, 0xc0, 0x0f, 0x00, 0x00,
0x01, 0x00, 0x00, 0xd7
};
static const char data_block_footer[DATA_BLOCK_FOOTER_SIZE] = {
0xfb, 0x14, 0x02, 0x20, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x00, 0x00, 0x4f
};
static inline struct usb_device *gm12u320_to_usb_device(struct gm12u320_device *gm12u320)
{
return interface_to_usbdev(to_usb_interface(gm12u320->dev.dev));
}
static int gm12u320_usb_alloc(struct gm12u320_device *gm12u320)
{
int i, block_size;
const char *hdr;
gm12u320->cmd_buf = drmm_kmalloc(&gm12u320->dev, CMD_SIZE, GFP_KERNEL);
if (!gm12u320->cmd_buf)
return -ENOMEM;
for (i = 0; i < GM12U320_BLOCK_COUNT; i++) {
if (i == GM12U320_BLOCK_COUNT - 1) {
block_size = DATA_LAST_BLOCK_SIZE;
hdr = data_last_block_header;
} else {
block_size = DATA_BLOCK_SIZE;
hdr = data_block_header;
}
gm12u320->data_buf[i] = drmm_kzalloc(&gm12u320->dev,
block_size, GFP_KERNEL);
if (!gm12u320->data_buf[i])
return -ENOMEM;
memcpy(gm12u320->data_buf[i], hdr, DATA_BLOCK_HEADER_SIZE);
memcpy(gm12u320->data_buf[i] +
(block_size - DATA_BLOCK_FOOTER_SIZE),
data_block_footer, DATA_BLOCK_FOOTER_SIZE);
}
return 0;
}
static int gm12u320_misc_request(struct gm12u320_device *gm12u320,
u8 req_a, u8 req_b,
u8 arg_a, u8 arg_b, u8 arg_c, u8 arg_d)
{
struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
int ret, len;
memcpy(gm12u320->cmd_buf, &cmd_misc, CMD_SIZE);
gm12u320->cmd_buf[20] = req_a;
gm12u320->cmd_buf[21] = req_b;
gm12u320->cmd_buf[22] = arg_a;
gm12u320->cmd_buf[23] = arg_b;
gm12u320->cmd_buf[24] = arg_c;
gm12u320->cmd_buf[25] = arg_d;
/* Send request */
ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, MISC_SND_EPT),
gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
if (ret || len != CMD_SIZE) {
GM12U320_ERR("Misc. req. error %d\n", ret);
return -EIO;
}
/* Read value */
ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
gm12u320->cmd_buf, MISC_VALUE_SIZE, &len,
DATA_TIMEOUT);
if (ret || len != MISC_VALUE_SIZE) {
GM12U320_ERR("Misc. value error %d\n", ret);
return -EIO;
}
/* cmd_buf[0] now contains the read value, which we don't use */
/* Read status */
ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, MISC_RCV_EPT),
gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
CMD_TIMEOUT);
if (ret || len != READ_STATUS_SIZE) {
GM12U320_ERR("Misc. status error %d\n", ret);
return -EIO;
}
return 0;
}
static void gm12u320_32bpp_to_24bpp_packed(u8 *dst, u8 *src, int len)
{
while (len--) {
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
src++;
}
}
static void gm12u320_copy_fb_to_blocks(struct gm12u320_device *gm12u320)
{
int block, dst_offset, len, remain, ret, x1, x2, y1, y2;
struct drm_framebuffer *fb;
struct dma_buf_map map;
void *vaddr;
u8 *src;
mutex_lock(&gm12u320->fb_update.lock);
if (!gm12u320->fb_update.fb)
goto unlock;
fb = gm12u320->fb_update.fb;
x1 = gm12u320->fb_update.rect.x1;
x2 = gm12u320->fb_update.rect.x2;
y1 = gm12u320->fb_update.rect.y1;
y2 = gm12u320->fb_update.rect.y2;
ret = drm_gem_shmem_vmap(fb->obj[0], &map);
if (ret) {
GM12U320_ERR("failed to vmap fb: %d\n", ret);
goto put_fb;
}
vaddr = map.vaddr; /* TODO: Use mapping abstraction properly */
if (fb->obj[0]->import_attach) {
ret = dma_buf_begin_cpu_access(
fb->obj[0]->import_attach->dmabuf, DMA_FROM_DEVICE);
if (ret) {
GM12U320_ERR("dma_buf_begin_cpu_access err: %d\n", ret);
goto vunmap;
}
}
src = vaddr + y1 * fb->pitches[0] + x1 * 4;
x1 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
x2 += (GM12U320_REAL_WIDTH - GM12U320_USER_WIDTH) / 2;
for (; y1 < y2; y1++) {
remain = 0;
len = (x2 - x1) * 3;
dst_offset = (y1 * GM12U320_REAL_WIDTH + x1) * 3;
block = dst_offset / DATA_BLOCK_CONTENT_SIZE;
dst_offset %= DATA_BLOCK_CONTENT_SIZE;
if ((dst_offset + len) > DATA_BLOCK_CONTENT_SIZE) {
remain = dst_offset + len - DATA_BLOCK_CONTENT_SIZE;
len = DATA_BLOCK_CONTENT_SIZE - dst_offset;
}
dst_offset += DATA_BLOCK_HEADER_SIZE;
len /= 3;
gm12u320_32bpp_to_24bpp_packed(
gm12u320->data_buf[block] + dst_offset,
src, len);
if (remain) {
block++;
dst_offset = DATA_BLOCK_HEADER_SIZE;
gm12u320_32bpp_to_24bpp_packed(
gm12u320->data_buf[block] + dst_offset,
src + len * 4, remain / 3);
}
src += fb->pitches[0];
}
if (fb->obj[0]->import_attach) {
ret = dma_buf_end_cpu_access(fb->obj[0]->import_attach->dmabuf,
DMA_FROM_DEVICE);
if (ret)
GM12U320_ERR("dma_buf_end_cpu_access err: %d\n", ret);
}
vunmap:
drm_gem_shmem_vunmap(fb->obj[0], &map);
put_fb:
drm_framebuffer_put(fb);
gm12u320->fb_update.fb = NULL;
unlock:
mutex_unlock(&gm12u320->fb_update.lock);
}
static void gm12u320_fb_update_work(struct work_struct *work)
{
struct gm12u320_device *gm12u320 =
container_of(to_delayed_work(work), struct gm12u320_device,
fb_update.work);
struct usb_device *udev = gm12u320_to_usb_device(gm12u320);
int block, block_size, len;
int ret = 0;
gm12u320_copy_fb_to_blocks(gm12u320);
for (block = 0; block < GM12U320_BLOCK_COUNT; block++) {
if (block == GM12U320_BLOCK_COUNT - 1)
block_size = DATA_LAST_BLOCK_SIZE;
else
block_size = DATA_BLOCK_SIZE;
/* Send data command to device */
memcpy(gm12u320->cmd_buf, cmd_data, CMD_SIZE);
gm12u320->cmd_buf[8] = block_size & 0xff;
gm12u320->cmd_buf[9] = block_size >> 8;
gm12u320->cmd_buf[20] = 0xfc - block * 4;
gm12u320->cmd_buf[21] =
block | (gm12u320->fb_update.frame << 7);
ret = usb_bulk_msg(udev,
usb_sndbulkpipe(udev, DATA_SND_EPT),
gm12u320->cmd_buf, CMD_SIZE, &len,
CMD_TIMEOUT);
if (ret || len != CMD_SIZE)
goto err;
/* Send data block to device */
ret = usb_bulk_msg(udev,
usb_sndbulkpipe(udev, DATA_SND_EPT),
gm12u320->data_buf[block], block_size,
&len, DATA_TIMEOUT);
if (ret || len != block_size)
goto err;
/* Read status */
ret = usb_bulk_msg(udev,
usb_rcvbulkpipe(udev, DATA_RCV_EPT),
gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
CMD_TIMEOUT);
if (ret || len != READ_STATUS_SIZE)
goto err;
}
/* Send draw command to device */
memcpy(gm12u320->cmd_buf, cmd_draw, CMD_SIZE);
ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, DATA_SND_EPT),
gm12u320->cmd_buf, CMD_SIZE, &len, CMD_TIMEOUT);
if (ret || len != CMD_SIZE)
goto err;
/* Read status */
ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, DATA_RCV_EPT),
gm12u320->cmd_buf, READ_STATUS_SIZE, &len,
gm12u320->fb_update.draw_status_timeout);
if (ret || len != READ_STATUS_SIZE)
goto err;
gm12u320->fb_update.draw_status_timeout = CMD_TIMEOUT;
gm12u320->fb_update.frame = !gm12u320->fb_update.frame;
/*
* We must draw a frame every 2s otherwise the projector
* switches back to showing its logo.
*/
queue_delayed_work(system_long_wq, &gm12u320->fb_update.work,
IDLE_TIMEOUT);
return;
err:
/* Do not log errors caused by module unload or device unplug */
if (ret != -ENODEV && ret != -ECONNRESET && ret != -ESHUTDOWN)
GM12U320_ERR("Frame update error: %d\n", ret);
}
static void gm12u320_fb_mark_dirty(struct drm_framebuffer *fb,
struct drm_rect *dirty)
{
struct gm12u320_device *gm12u320 = to_gm12u320(fb->dev);
struct drm_framebuffer *old_fb = NULL;
bool wakeup = false;
mutex_lock(&gm12u320->fb_update.lock);
if (gm12u320->fb_update.fb != fb) {
old_fb = gm12u320->fb_update.fb;
drm_framebuffer_get(fb);
gm12u320->fb_update.fb = fb;
gm12u320->fb_update.rect = *dirty;
wakeup = true;
} else {
struct drm_rect *rect = &gm12u320->fb_update.rect;
rect->x1 = min(rect->x1, dirty->x1);
rect->y1 = min(rect->y1, dirty->y1);
rect->x2 = max(rect->x2, dirty->x2);
rect->y2 = max(rect->y2, dirty->y2);
}
mutex_unlock(&gm12u320->fb_update.lock);
if (wakeup)
mod_delayed_work(system_long_wq, &gm12u320->fb_update.work, 0);
if (old_fb)
drm_framebuffer_put(old_fb);
}
static void gm12u320_stop_fb_update(struct gm12u320_device *gm12u320)
{
struct drm_framebuffer *old_fb;
cancel_delayed_work_sync(&gm12u320->fb_update.work);
mutex_lock(&gm12u320->fb_update.lock);
old_fb = gm12u320->fb_update.fb;
gm12u320->fb_update.fb = NULL;
mutex_unlock(&gm12u320->fb_update.lock);
drm_framebuffer_put(old_fb);
}
static int gm12u320_set_ecomode(struct gm12u320_device *gm12u320)
{
return gm12u320_misc_request(gm12u320, MISC_REQ_GET_SET_ECO_A,
MISC_REQ_GET_SET_ECO_B, 0x01 /* set */,
eco_mode ? 0x01 : 0x00, 0x00, 0x01);
}
/* ------------------------------------------------------------------ */
/* gm12u320 connector */
/*
* We use fake EDID info so that userspace know that it is dealing with
* an Acer projector, rather then listing this as an "unknown" monitor.
* Note this assumes this driver is only ever used with the Acer C120, if we
* add support for other devices the vendor and model should be parameterized.
*/
static struct edid gm12u320_edid = {
.header = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 },
.mfg_id = { 0x04, 0x72 }, /* "ACR" */
.prod_code = { 0x20, 0xc1 }, /* C120h */
.serial = 0xaa55aa55,
.mfg_week = 1,
.mfg_year = 16,
.version = 1, /* EDID 1.3 */
.revision = 3, /* EDID 1.3 */
.input = 0x08, /* Analog input */
.features = 0x0a, /* Pref timing in DTD 1 */
.standard_timings = { { 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 },
{ 1, 1 }, { 1, 1 }, { 1, 1 }, { 1, 1 } },
.detailed_timings = { {
.pixel_clock = 3383,
/* hactive = 848, hblank = 256 */
.data.pixel_data.hactive_lo = 0x50,
.data.pixel_data.hblank_lo = 0x00,
.data.pixel_data.hactive_hblank_hi = 0x31,
/* vactive = 480, vblank = 28 */
.data.pixel_data.vactive_lo = 0xe0,
.data.pixel_data.vblank_lo = 0x1c,
.data.pixel_data.vactive_vblank_hi = 0x10,
/* hsync offset 40 pw 128, vsync offset 1 pw 4 */
.data.pixel_data.hsync_offset_lo = 0x28,
.data.pixel_data.hsync_pulse_width_lo = 0x80,
.data.pixel_data.vsync_offset_pulse_width_lo = 0x14,
.data.pixel_data.hsync_vsync_offset_pulse_width_hi = 0x00,
/* Digital separate syncs, hsync+, vsync+ */
.data.pixel_data.misc = 0x1e,
}, {
.pixel_clock = 0,
.data.other_data.type = 0xfd, /* Monitor ranges */
.data.other_data.data.range.min_vfreq = 59,
.data.other_data.data.range.max_vfreq = 61,
.data.other_data.data.range.min_hfreq_khz = 29,
.data.other_data.data.range.max_hfreq_khz = 32,
.data.other_data.data.range.pixel_clock_mhz = 4, /* 40 MHz */
.data.other_data.data.range.flags = 0,
.data.other_data.data.range.formula.cvt = {
0xa0, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 },
}, {
.pixel_clock = 0,
.data.other_data.type = 0xfc, /* Model string */
.data.other_data.data.str.str = {
'P', 'r', 'o', 'j', 'e', 'c', 't', 'o', 'r', '\n',
' ', ' ', ' ' },
}, {
.pixel_clock = 0,
.data.other_data.type = 0xfe, /* Unspecified text / padding */
.data.other_data.data.str.str = {
'\n', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
' ', ' ', ' ' },
} },
.checksum = 0x13,
};
static int gm12u320_conn_get_modes(struct drm_connector *connector)
{
drm_connector_update_edid_property(connector, &gm12u320_edid);
return drm_add_edid_modes(connector, &gm12u320_edid);
}
static const struct drm_connector_helper_funcs gm12u320_conn_helper_funcs = {
.get_modes = gm12u320_conn_get_modes,
};
static const struct drm_connector_funcs gm12u320_conn_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int gm12u320_conn_init(struct gm12u320_device *gm12u320)
{
drm_connector_helper_add(&gm12u320->conn, &gm12u320_conn_helper_funcs);
return drm_connector_init(&gm12u320->dev, &gm12u320->conn,
&gm12u320_conn_funcs, DRM_MODE_CONNECTOR_VGA);
}
/* ------------------------------------------------------------------ */
/* gm12u320 (simple) display pipe */
static void gm12u320_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
struct drm_rect rect = { 0, 0, GM12U320_USER_WIDTH, GM12U320_HEIGHT };
struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
gm12u320->fb_update.draw_status_timeout = FIRST_FRAME_TIMEOUT;
gm12u320_fb_mark_dirty(plane_state->fb, &rect);
}
static void gm12u320_pipe_disable(struct drm_simple_display_pipe *pipe)
{
struct gm12u320_device *gm12u320 = to_gm12u320(pipe->crtc.dev);
gm12u320_stop_fb_update(gm12u320);
}
static void gm12u320_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state)
{
struct drm_plane_state *state = pipe->plane.state;
struct drm_rect rect;
if (drm_atomic_helper_damage_merged(old_state, state, &rect))
gm12u320_fb_mark_dirty(pipe->plane.state->fb, &rect);
}
static const struct drm_simple_display_pipe_funcs gm12u320_pipe_funcs = {
.enable = gm12u320_pipe_enable,
.disable = gm12u320_pipe_disable,
.update = gm12u320_pipe_update,
};
static const uint32_t gm12u320_pipe_formats[] = {
DRM_FORMAT_XRGB8888,
};
static const uint64_t gm12u320_pipe_modifiers[] = {
DRM_FORMAT_MOD_LINEAR,
DRM_FORMAT_MOD_INVALID
};
/*
* FIXME: Dma-buf sharing requires DMA support by the importing device.
* This function is a workaround to make USB devices work as well.
* See todo.rst for how to fix the issue in the dma-buf framework.
*/
static struct drm_gem_object *gm12u320_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct gm12u320_device *gm12u320 = to_gm12u320(dev);
if (!gm12u320->dmadev)
return ERR_PTR(-ENODEV);
return drm_gem_prime_import_dev(dev, dma_buf, gm12u320->dmadev);
}
DEFINE_DRM_GEM_FOPS(gm12u320_fops);
static const struct drm_driver gm12u320_drm_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.fops = &gm12u320_fops,
DRM_GEM_SHMEM_DRIVER_OPS,
.gem_prime_import = gm12u320_gem_prime_import,
};
static const struct drm_mode_config_funcs gm12u320_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static int gm12u320_usb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct gm12u320_device *gm12u320;
struct drm_device *dev;
int ret;
/*
* The gm12u320 presents itself to the system as 2 usb mass-storage
* interfaces, we only care about / need the first one.
*/
if (interface->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
gm12u320 = devm_drm_dev_alloc(&interface->dev, &gm12u320_drm_driver,
struct gm12u320_device, dev);
if (IS_ERR(gm12u320))
return PTR_ERR(gm12u320);
dev = &gm12u320->dev;
gm12u320->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
if (!gm12u320->dmadev)
drm_warn(dev, "buffer sharing not supported"); /* not an error */
INIT_DELAYED_WORK(&gm12u320->fb_update.work, gm12u320_fb_update_work);
mutex_init(&gm12u320->fb_update.lock);
ret = drmm_mode_config_init(dev);
if (ret)
goto err_put_device;
dev->mode_config.min_width = GM12U320_USER_WIDTH;
dev->mode_config.max_width = GM12U320_USER_WIDTH;
dev->mode_config.min_height = GM12U320_HEIGHT;
dev->mode_config.max_height = GM12U320_HEIGHT;
dev->mode_config.funcs = &gm12u320_mode_config_funcs;
ret = gm12u320_usb_alloc(gm12u320);
if (ret)
goto err_put_device;
ret = gm12u320_set_ecomode(gm12u320);
if (ret)
goto err_put_device;
ret = gm12u320_conn_init(gm12u320);
if (ret)
goto err_put_device;
ret = drm_simple_display_pipe_init(&gm12u320->dev,
&gm12u320->pipe,
&gm12u320_pipe_funcs,
gm12u320_pipe_formats,
ARRAY_SIZE(gm12u320_pipe_formats),
gm12u320_pipe_modifiers,
&gm12u320->conn);
if (ret)
goto err_put_device;
drm_mode_config_reset(dev);
usb_set_intfdata(interface, dev);
ret = drm_dev_register(dev, 0);
if (ret)
goto err_put_device;
drm_fbdev_generic_setup(dev, 0);
return 0;
err_put_device:
put_device(gm12u320->dmadev);
return ret;
}
static void gm12u320_usb_disconnect(struct usb_interface *interface)
{
struct drm_device *dev = usb_get_intfdata(interface);
struct gm12u320_device *gm12u320 = to_gm12u320(dev);
put_device(gm12u320->dmadev);
gm12u320->dmadev = NULL;
drm_dev_unplug(dev);
drm_atomic_helper_shutdown(dev);
}
static __maybe_unused int gm12u320_suspend(struct usb_interface *interface,
pm_message_t message)
{
struct drm_device *dev = usb_get_intfdata(interface);
return drm_mode_config_helper_suspend(dev);
}
static __maybe_unused int gm12u320_resume(struct usb_interface *interface)
{
struct drm_device *dev = usb_get_intfdata(interface);
struct gm12u320_device *gm12u320 = to_gm12u320(dev);
gm12u320_set_ecomode(gm12u320);
return drm_mode_config_helper_resume(dev);
}
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x1de1, 0xc102) },
{},
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_driver gm12u320_usb_driver = {
.name = "gm12u320",
.probe = gm12u320_usb_probe,
.disconnect = gm12u320_usb_disconnect,
.id_table = id_table,
#ifdef CONFIG_PM
.suspend = gm12u320_suspend,
.resume = gm12u320_resume,
.reset_resume = gm12u320_resume,
#endif
};
module_usb_driver(gm12u320_usb_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");
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