include/linux/mmc/host.h

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