1 /*
2 * linux/include/linux/mmc/host.h
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Host driver specific definitions.
9 */
10 #ifndef LINUX_MMC_HOST_H
11 #define LINUX_MMC_HOST_H
12
13 #include <linux/leds.h>
14 #include <linux/mutex.h>
15 #include <linux/timer.h>
16 #include <linux/sched.h>
17 #include <linux/device.h>
18 #include <linux/fault-inject.h>
19 #include <linux/blkdev.h>
20
21 #include <linux/mmc/core.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/pm.h>
24
25 struct mmc_ios {
26 unsigned int clock; /* clock rate */
27 unsigned short vdd;
28
29 /* vdd stores the bit number of the selected voltage range from below. */
30
31 unsigned char bus_mode; /* command output mode */
32
33 #define MMC_BUSMODE_OPENDRAIN 1
34 #define MMC_BUSMODE_PUSHPULL 2
35
36 unsigned char chip_select; /* SPI chip select */
37
38 #define MMC_CS_DONTCARE 0
39 #define MMC_CS_HIGH 1
40 #define MMC_CS_LOW 2
41
42 unsigned char power_mode; /* power supply mode */
43
44 #define MMC_POWER_OFF 0
45 #define MMC_POWER_UP 1
46 #define MMC_POWER_ON 2
47 #define MMC_POWER_UNDEFINED 3
48
49 unsigned char bus_width; /* data bus width */
50
51 #define MMC_BUS_WIDTH_1 0
52 #define MMC_BUS_WIDTH_4 2
53 #define MMC_BUS_WIDTH_8 3
54
55 unsigned char timing; /* timing specification used */
56
57 #define MMC_TIMING_LEGACY 0
58 #define MMC_TIMING_MMC_HS 1
59 #define MMC_TIMING_SD_HS 2
60 #define MMC_TIMING_UHS_SDR12 3
61 #define MMC_TIMING_UHS_SDR25 4
62 #define MMC_TIMING_UHS_SDR50 5
63 #define MMC_TIMING_UHS_SDR104 6
64 #define MMC_TIMING_UHS_DDR50 7
65 #define MMC_TIMING_MMC_DDR52 8
66 #define MMC_TIMING_MMC_HS200 9
67 #define MMC_TIMING_MMC_HS400 10
68
69 unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
70
71 #define MMC_SIGNAL_VOLTAGE_330 0
72 #define MMC_SIGNAL_VOLTAGE_180 1
73 #define MMC_SIGNAL_VOLTAGE_120 2
74
75 unsigned char drv_type; /* driver type (A, B, C, D) */
76
77 #define MMC_SET_DRIVER_TYPE_B 0
78 #define MMC_SET_DRIVER_TYPE_A 1
79 #define MMC_SET_DRIVER_TYPE_C 2
80 #define MMC_SET_DRIVER_TYPE_D 3
81 };
82
83 struct mmc_host_ops {
84 /*
85 * It is optional for the host to implement pre_req and post_req in
86 * order to support double buffering of requests (prepare one
87 * request while another request is active).
88 * pre_req() must always be followed by a post_req().
89 * To undo a call made to pre_req(), call post_req() with
90 * a nonzero err condition.
91 */
92 void (*post_req)(struct mmc_host *host, struct mmc_request *req,
93 int err);
94 void (*pre_req)(struct mmc_host *host, struct mmc_request *req,
95 bool is_first_req);
96 void (*request)(struct mmc_host *host, struct mmc_request *req);
97 /*
98 * Avoid calling these three functions too often or in a "fast path",
99 * since underlaying controller might implement them in an expensive
100 * and/or slow way.
101 *
102 * Also note that these functions might sleep, so don't call them
103 * in the atomic contexts!
104 *
105 * Return values for the get_ro callback should be:
106 * 0 for a read/write card
107 * 1 for a read-only card
108 * -ENOSYS when not supported (equal to NULL callback)
109 * or a negative errno value when something bad happened
110 *
111 * Return values for the get_cd callback should be:
112 * 0 for a absent card
113 * 1 for a present card
114 * -ENOSYS when not supported (equal to NULL callback)
115 * or a negative errno value when something bad happened
116 */
117 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
118 int (*get_ro)(struct mmc_host *host);
119 int (*get_cd)(struct mmc_host *host);
120
121 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
122
123 /* optional callback for HC quirks */
124 void (*init_card)(struct mmc_host *host, struct mmc_card *card);
125
126 int (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
127
128 /* Check if the card is pulling dat[0:3] low */
129 int (*card_busy)(struct mmc_host *host);
130
131 /* The tuning command opcode value is different for SD and eMMC cards */
132 int (*execute_tuning)(struct mmc_host *host, u32 opcode);
133
134 /* Prepare HS400 target operating frequency depending host driver */
135 int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);
136 int (*select_drive_strength)(struct mmc_card *card,
137 unsigned int max_dtr, int host_drv,
138 int card_drv, int *drv_type);
139 void (*hw_reset)(struct mmc_host *host);
140 void (*card_event)(struct mmc_host *host);
141
142 /*
143 * Optional callback to support controllers with HW issues for multiple
144 * I/O. Returns the number of supported blocks for the request.
145 */
146 int (*multi_io_quirk)(struct mmc_card *card,
147 unsigned int direction, int blk_size);
148 };
149
150 struct mmc_card;
151 struct device;
152
153 struct mmc_async_req {
154 /* active mmc request */
155 struct mmc_request *mrq;
156 /*
157 * Check error status of completed mmc request.
158 * Returns 0 if success otherwise non zero.
159 */
160 int (*err_check) (struct mmc_card *, struct mmc_async_req *);
161 };
162
163 /**
164 * struct mmc_slot - MMC slot functions
165 *
166 * @cd_irq: MMC/SD-card slot hotplug detection IRQ or -EINVAL
167 * @handler_priv: MMC/SD-card slot context
168 *
169 * Some MMC/SD host controllers implement slot-functions like card and
170 * write-protect detection natively. However, a large number of controllers
171 * leave these functions to the CPU. This struct provides a hook to attach
172 * such slot-function drivers.
173 */
174 struct mmc_slot {
175 int cd_irq;
176 void *handler_priv;
177 };
178
179 /**
180 * mmc_context_info - synchronization details for mmc context
181 * @is_done_rcv wake up reason was done request
182 * @is_new_req wake up reason was new request
183 * @is_waiting_last_req mmc context waiting for single running request
184 * @wait wait queue
185 * @lock lock to protect data fields
186 */
187 struct mmc_context_info {
188 bool is_done_rcv;
189 bool is_new_req;
190 bool is_waiting_last_req;
191 wait_queue_head_t wait;
192 spinlock_t lock;
193 };
194
195 struct regulator;
196 struct mmc_pwrseq;
197
198 struct mmc_supply {
199 struct regulator *vmmc; /* Card power supply */
200 struct regulator *vqmmc; /* Optional Vccq supply */
201 };
202
203 struct mmc_host {
204 struct device *parent;
205 struct device class_dev;
206 int index;
207 const struct mmc_host_ops *ops;
208 struct mmc_pwrseq *pwrseq;
209 unsigned int f_min;
210 unsigned int f_max;
211 unsigned int f_init;
212 u32 ocr_avail;
213 u32 ocr_avail_sdio; /* SDIO-specific OCR */
214 u32 ocr_avail_sd; /* SD-specific OCR */
215 u32 ocr_avail_mmc; /* MMC-specific OCR */
216 struct notifier_block pm_notify;
217 u32 max_current_330;
218 u32 max_current_300;
219 u32 max_current_180;
220
221 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
222 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
223 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
224 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
225 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
226 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
227 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
228 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
229 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
230 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
231 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
232 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
233 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
234 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
235 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
236 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
237 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
238
239 u32 caps; /* Host capabilities */
240
241 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
242 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
243 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
244 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
245 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
246 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
247 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
248 #define MMC_CAP_AGGRESSIVE_PM (1 << 7) /* Suspend (e)MMC/SD at idle */
249 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
250 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
251 #define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */
252 #define MMC_CAP_1_8V_DDR (1 << 11) /* can support */
253 /* DDR mode at 1.8V */
254 #define MMC_CAP_1_2V_DDR (1 << 12) /* can support */
255 /* DDR mode at 1.2V */
256 #define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off after boot */
257 #define MMC_CAP_BUS_WIDTH_TEST (1 << 14) /* CMD14/CMD19 bus width ok */
258 #define MMC_CAP_UHS_SDR12 (1 << 15) /* Host supports UHS SDR12 mode */
259 #define MMC_CAP_UHS_SDR25 (1 << 16) /* Host supports UHS SDR25 mode */
260 #define MMC_CAP_UHS_SDR50 (1 << 17) /* Host supports UHS SDR50 mode */
261 #define MMC_CAP_UHS_SDR104 (1 << 18) /* Host supports UHS SDR104 mode */
262 #define MMC_CAP_UHS_DDR50 (1 << 19) /* Host supports UHS DDR50 mode */
263 #define MMC_CAP_RUNTIME_RESUME (1 << 20) /* Resume at runtime_resume. */
264 #define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */
265 #define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */
266 #define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */
267 #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */
268 #define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */
269
270 u32 caps2; /* More host capabilities */
271
272 #define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
273 #define MMC_CAP2_FULL_PWR_CYCLE (1 << 2) /* Can do full power cycle */
274 #define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */
275 #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */
276 #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \
277 MMC_CAP2_HS200_1_2V_SDR)
278 #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */
279 #define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */
280 #define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */
281 #define MMC_CAP2_PACKED_RD (1 << 12) /* Allow packed read */
282 #define MMC_CAP2_PACKED_WR (1 << 13) /* Allow packed write */
283 #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
284 MMC_CAP2_PACKED_WR)
285 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
286 #define MMC_CAP2_HS400_1_8V (1 << 15) /* Can support HS400 1.8V */
287 #define MMC_CAP2_HS400_1_2V (1 << 16) /* Can support HS400 1.2V */
288 #define MMC_CAP2_HS400 (MMC_CAP2_HS400_1_8V | \
289 MMC_CAP2_HS400_1_2V)
290 #define MMC_CAP2_HSX00_1_2V (MMC_CAP2_HS200_1_2V_SDR | MMC_CAP2_HS400_1_2V)
291 #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17)
292 #define MMC_CAP2_NO_WRITE_PROTECT (1 << 18) /* No physical write protect pin, assume that card is always read-write */
293
294 mmc_pm_flag_t pm_caps; /* supported pm features */
295
296 /* host specific block data */
297 unsigned int max_seg_size; /* see blk_queue_max_segment_size */
298 unsigned short max_segs; /* see blk_queue_max_segments */
299 unsigned short unused;
300 unsigned int max_req_size; /* maximum number of bytes in one req */
301 unsigned int max_blk_size; /* maximum size of one mmc block */
302 unsigned int max_blk_count; /* maximum number of blocks in one req */
303 unsigned int max_busy_timeout; /* max busy timeout in ms */
304
305 /* private data */
306 spinlock_t lock; /* lock for claim and bus ops */
307
308 struct mmc_ios ios; /* current io bus settings */
309
310 /* group bitfields together to minimize padding */
311 unsigned int use_spi_crc:1;
312 unsigned int claimed:1; /* host exclusively claimed */
313 unsigned int bus_dead:1; /* bus has been released */
314 #ifdef CONFIG_MMC_DEBUG
315 unsigned int removed:1; /* host is being removed */
316 #endif
317 unsigned int can_retune:1; /* re-tuning can be used */
318 unsigned int doing_retune:1; /* re-tuning in progress */
319 unsigned int retune_now:1; /* do re-tuning at next req */
320
321 int rescan_disable; /* disable card detection */
322 int rescan_entered; /* used with nonremovable devices */
323
324 int need_retune; /* re-tuning is needed */
325 int hold_retune; /* hold off re-tuning */
326 unsigned int retune_period; /* re-tuning period in secs */
327 struct timer_list retune_timer; /* for periodic re-tuning */
328
329 bool trigger_card_event; /* card_event necessary */
330
331 struct mmc_card *card; /* device attached to this host */
332
333 wait_queue_head_t wq;
334 struct task_struct *claimer; /* task that has host claimed */
335 int claim_cnt; /* "claim" nesting count */
336
337 struct delayed_work detect;
338 int detect_change; /* card detect flag */
339 struct mmc_slot slot;
340
341 const struct mmc_bus_ops *bus_ops; /* current bus driver */
342 unsigned int bus_refs; /* reference counter */
343
344 unsigned int sdio_irqs;
345 struct task_struct *sdio_irq_thread;
346 bool sdio_irq_pending;
347 atomic_t sdio_irq_thread_abort;
348
349 mmc_pm_flag_t pm_flags; /* requested pm features */
350
351 struct led_trigger *led; /* activity led */
352
353 #ifdef CONFIG_REGULATOR
354 bool regulator_enabled; /* regulator state */
355 #endif
356 struct mmc_supply supply;
357
358 struct dentry *debugfs_root;
359
360 struct mmc_async_req *areq; /* active async req */
361 struct mmc_context_info context_info; /* async synchronization info */
362
363 #ifdef CONFIG_FAIL_MMC_REQUEST
364 struct fault_attr fail_mmc_request;
365 #endif
366
367 unsigned int actual_clock; /* Actual HC clock rate */
368
369 unsigned int slotno; /* used for sdio acpi binding */
370
371 int dsr_req; /* DSR value is valid */
372 u32 dsr; /* optional driver stage (DSR) value */
373
374 #ifdef CONFIG_MMC_EMBEDDED_SDIO
375 struct {
376 struct sdio_cis *cis;
377 struct sdio_cccr *cccr;
378 struct sdio_embedded_func *funcs;
379 int num_funcs;
380 } embedded_sdio_data;
381 #endif
382
383 #ifdef CONFIG_BLOCK
384 int latency_hist_enabled;
385 struct io_latency_state io_lat_read;
386 struct io_latency_state io_lat_write;
387 #endif
388
389 unsigned long private[0] ____cacheline_aligned;
390 };
391
392 struct mmc_host *mmc_alloc_host(int extra, struct device *);
393 int mmc_add_host(struct mmc_host *);
394 void mmc_remove_host(struct mmc_host *);
395 void mmc_free_host(struct mmc_host *);
396 int mmc_of_parse(struct mmc_host *host);
397
398 #ifdef CONFIG_MMC_EMBEDDED_SDIO
399 extern void mmc_set_embedded_sdio_data(struct mmc_host *host,
400 struct sdio_cis *cis,
401 struct sdio_cccr *cccr,
402 struct sdio_embedded_func *funcs,
403 int num_funcs);
404 #endif
405
mmc_priv(struct mmc_host * host)406 static inline void *mmc_priv(struct mmc_host *host)
407 {
408 return (void *)host->private;
409 }
410
411 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
412
413 #define mmc_dev(x) ((x)->parent)
414 #define mmc_classdev(x) (&(x)->class_dev)
415 #define mmc_hostname(x) (dev_name(&(x)->class_dev))
416
417 int mmc_power_save_host(struct mmc_host *host);
418 int mmc_power_restore_host(struct mmc_host *host);
419
420 void mmc_detect_change(struct mmc_host *, unsigned long delay);
421 void mmc_request_done(struct mmc_host *, struct mmc_request *);
422
mmc_signal_sdio_irq(struct mmc_host * host)423 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
424 {
425 host->ops->enable_sdio_irq(host, 0);
426 host->sdio_irq_pending = true;
427 if (host->sdio_irq_thread)
428 wake_up_process(host->sdio_irq_thread);
429 }
430
431 void sdio_run_irqs(struct mmc_host *host);
432
433 #ifdef CONFIG_REGULATOR
434 int mmc_regulator_get_ocrmask(struct regulator *supply);
435 int mmc_regulator_set_ocr(struct mmc_host *mmc,
436 struct regulator *supply,
437 unsigned short vdd_bit);
438 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios);
439 #else
mmc_regulator_get_ocrmask(struct regulator * supply)440 static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
441 {
442 return 0;
443 }
444
mmc_regulator_set_ocr(struct mmc_host * mmc,struct regulator * supply,unsigned short vdd_bit)445 static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
446 struct regulator *supply,
447 unsigned short vdd_bit)
448 {
449 return 0;
450 }
451
mmc_regulator_set_vqmmc(struct mmc_host * mmc,struct mmc_ios * ios)452 static inline int mmc_regulator_set_vqmmc(struct mmc_host *mmc,
453 struct mmc_ios *ios)
454 {
455 return -EINVAL;
456 }
457 #endif
458
459 int mmc_regulator_get_supply(struct mmc_host *mmc);
460
461 int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
462
mmc_card_is_removable(struct mmc_host * host)463 static inline int mmc_card_is_removable(struct mmc_host *host)
464 {
465 return !(host->caps & MMC_CAP_NONREMOVABLE);
466 }
467
mmc_card_keep_power(struct mmc_host * host)468 static inline int mmc_card_keep_power(struct mmc_host *host)
469 {
470 return host->pm_flags & MMC_PM_KEEP_POWER;
471 }
472
mmc_card_wake_sdio_irq(struct mmc_host * host)473 static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
474 {
475 return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
476 }
477
mmc_host_cmd23(struct mmc_host * host)478 static inline int mmc_host_cmd23(struct mmc_host *host)
479 {
480 return host->caps & MMC_CAP_CMD23;
481 }
482
mmc_boot_partition_access(struct mmc_host * host)483 static inline int mmc_boot_partition_access(struct mmc_host *host)
484 {
485 return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
486 }
487
mmc_host_uhs(struct mmc_host * host)488 static inline int mmc_host_uhs(struct mmc_host *host)
489 {
490 return host->caps &
491 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
492 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
493 MMC_CAP_UHS_DDR50);
494 }
495
mmc_host_packed_wr(struct mmc_host * host)496 static inline int mmc_host_packed_wr(struct mmc_host *host)
497 {
498 return host->caps2 & MMC_CAP2_PACKED_WR;
499 }
500
mmc_card_hs(struct mmc_card * card)501 static inline int mmc_card_hs(struct mmc_card *card)
502 {
503 return card->host->ios.timing == MMC_TIMING_SD_HS ||
504 card->host->ios.timing == MMC_TIMING_MMC_HS;
505 }
506
mmc_card_uhs(struct mmc_card * card)507 static inline int mmc_card_uhs(struct mmc_card *card)
508 {
509 return card->host->ios.timing >= MMC_TIMING_UHS_SDR12 &&
510 card->host->ios.timing <= MMC_TIMING_UHS_DDR50;
511 }
512
mmc_card_hs200(struct mmc_card * card)513 static inline bool mmc_card_hs200(struct mmc_card *card)
514 {
515 return card->host->ios.timing == MMC_TIMING_MMC_HS200;
516 }
517
mmc_card_ddr52(struct mmc_card * card)518 static inline bool mmc_card_ddr52(struct mmc_card *card)
519 {
520 return card->host->ios.timing == MMC_TIMING_MMC_DDR52;
521 }
522
mmc_card_hs400(struct mmc_card * card)523 static inline bool mmc_card_hs400(struct mmc_card *card)
524 {
525 return card->host->ios.timing == MMC_TIMING_MMC_HS400;
526 }
527
528 void mmc_retune_timer_stop(struct mmc_host *host);
529
mmc_retune_needed(struct mmc_host * host)530 static inline void mmc_retune_needed(struct mmc_host *host)
531 {
532 if (host->can_retune)
533 host->need_retune = 1;
534 }
535
mmc_retune_recheck(struct mmc_host * host)536 static inline void mmc_retune_recheck(struct mmc_host *host)
537 {
538 if (host->hold_retune <= 1)
539 host->retune_now = 1;
540 }
541
542 #endif /* LINUX_MMC_HOST_H */
543