OpenWrt – Blame information for rev 4

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Rev Author Line No. Line
4 office 1 From 4215d5757595e7ec7ca146c2b901beb177f415d8 Mon Sep 17 00:00:00 2001
2 From: Yangbo Lu <yangbo.lu@nxp.com>
3 Date: Wed, 17 Jan 2018 15:37:13 +0800
4 Subject: [PATCH 24/30] mmc: layerscape support
5  
6 This is an integrated patch for layerscape mmc support.
7  
8 Adrian Hunter <adrian.hunter@intel.com>
9 Jaehoon Chung <jh80.chung@samsung.com>
10 Masahiro Yamada <yamada.masahiro@socionext.com>
11 Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
12 ---
13 drivers/mmc/host/Kconfig | 1 +
14 drivers/mmc/host/sdhci-esdhc.h | 52 +++++---
15 drivers/mmc/host/sdhci-of-esdhc.c | 265 ++++++++++++++++++++++++++++++++++++--
16 drivers/mmc/host/sdhci.c | 45 ++++---
17 drivers/mmc/host/sdhci.h | 3 +
18 5 files changed, 320 insertions(+), 46 deletions(-)
19  
20 --- a/drivers/mmc/host/Kconfig
21 +++ b/drivers/mmc/host/Kconfig
22 @@ -144,6 +144,7 @@ config MMC_SDHCI_OF_ESDHC
23 depends on MMC_SDHCI_PLTFM
24 depends on PPC || ARCH_MXC || ARCH_LAYERSCAPE
25 select MMC_SDHCI_IO_ACCESSORS
26 + select FSL_GUTS
27 help
28 This selects the Freescale eSDHC controller support.
29  
30 --- a/drivers/mmc/host/sdhci-esdhc.h
31 +++ b/drivers/mmc/host/sdhci-esdhc.h
32 @@ -24,30 +24,46 @@
33 SDHCI_QUIRK_PIO_NEEDS_DELAY | \
34 SDHCI_QUIRK_NO_HISPD_BIT)
35  
36 -#define ESDHC_PROCTL 0x28
37 -
38 -#define ESDHC_SYSTEM_CONTROL 0x2c
39 -#define ESDHC_CLOCK_MASK 0x0000fff0
40 -#define ESDHC_PREDIV_SHIFT 8
41 -#define ESDHC_DIVIDER_SHIFT 4
42 -#define ESDHC_CLOCK_PEREN 0x00000004
43 -#define ESDHC_CLOCK_HCKEN 0x00000002
44 -#define ESDHC_CLOCK_IPGEN 0x00000001
45 -
46 /* pltfm-specific */
47 #define ESDHC_HOST_CONTROL_LE 0x20
48  
49 /*
50 - * P2020 interpretation of the SDHCI_HOST_CONTROL register
51 + * eSDHC register definition
52 */
53 -#define ESDHC_CTRL_4BITBUS (0x1 << 1)
54 -#define ESDHC_CTRL_8BITBUS (0x2 << 1)
55 -#define ESDHC_CTRL_BUSWIDTH_MASK (0x3 << 1)
56 -
57 -/* OF-specific */
58 -#define ESDHC_DMA_SYSCTL 0x40c
59 -#define ESDHC_DMA_SNOOP 0x00000040
60  
61 -#define ESDHC_HOST_CONTROL_RES 0x01
62 +/* Present State Register */
63 +#define ESDHC_PRSSTAT 0x24
64 +#define ESDHC_CLOCK_STABLE 0x00000008
65 +
66 +/* Protocol Control Register */
67 +#define ESDHC_PROCTL 0x28
68 +#define ESDHC_VOLT_SEL 0x00000400
69 +#define ESDHC_CTRL_4BITBUS (0x1 << 1)
70 +#define ESDHC_CTRL_8BITBUS (0x2 << 1)
71 +#define ESDHC_CTRL_BUSWIDTH_MASK (0x3 << 1)
72 +#define ESDHC_HOST_CONTROL_RES 0x01
73 +
74 +/* System Control Register */
75 +#define ESDHC_SYSTEM_CONTROL 0x2c
76 +#define ESDHC_CLOCK_MASK 0x0000fff0
77 +#define ESDHC_PREDIV_SHIFT 8
78 +#define ESDHC_DIVIDER_SHIFT 4
79 +#define ESDHC_CLOCK_SDCLKEN 0x00000008
80 +#define ESDHC_CLOCK_PEREN 0x00000004
81 +#define ESDHC_CLOCK_HCKEN 0x00000002
82 +#define ESDHC_CLOCK_IPGEN 0x00000001
83 +
84 +/* Host Controller Capabilities Register 2 */
85 +#define ESDHC_CAPABILITIES_1 0x114
86 +
87 +/* Tuning Block Control Register */
88 +#define ESDHC_TBCTL 0x120
89 +#define ESDHC_TB_EN 0x00000004
90 +
91 +/* Control Register for DMA transfer */
92 +#define ESDHC_DMA_SYSCTL 0x40c
93 +#define ESDHC_PERIPHERAL_CLK_SEL 0x00080000
94 +#define ESDHC_FLUSH_ASYNC_FIFO 0x00040000
95 +#define ESDHC_DMA_SNOOP 0x00000040
96  
97 #endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */
98 --- a/drivers/mmc/host/sdhci-of-esdhc.c
99 +++ b/drivers/mmc/host/sdhci-of-esdhc.c
100 @@ -16,8 +16,12 @@
101 #include <linux/err.h>
102 #include <linux/io.h>
103 #include <linux/of.h>
104 +#include <linux/of_address.h>
105 #include <linux/delay.h>
106 #include <linux/module.h>
107 +#include <linux/sys_soc.h>
108 +#include <linux/clk.h>
109 +#include <linux/ktime.h>
110 #include <linux/mmc/host.h>
111 #include "sdhci-pltfm.h"
112 #include "sdhci-esdhc.h"
113 @@ -28,8 +32,12 @@
114 struct sdhci_esdhc {
115 u8 vendor_ver;
116 u8 spec_ver;
117 + bool quirk_incorrect_hostver;
118 + unsigned int peripheral_clock;
119 };
120  
121 +static void esdhc_clock_enable(struct sdhci_host *host, bool enable);
122 +
123 /**
124 * esdhc_read*_fixup - Fixup the value read from incompatible eSDHC register
125 * to make it compatible with SD spec.
126 @@ -80,6 +88,17 @@ static u32 esdhc_readl_fixup(struct sdhc
127 return ret;
128 }
129  
130 + /*
131 + * DTS properties of mmc host are used to enable each speed mode
132 + * according to soc and board capability. So clean up
133 + * SDR50/SDR104/DDR50 support bits here.
134 + */
135 + if (spec_reg == SDHCI_CAPABILITIES_1) {
136 + ret = value & (~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
137 + SDHCI_SUPPORT_DDR50));
138 + return ret;
139 + }
140 +
141 ret = value;
142 return ret;
143 }
144 @@ -87,6 +106,8 @@ static u32 esdhc_readl_fixup(struct sdhc
145 static u16 esdhc_readw_fixup(struct sdhci_host *host,
146 int spec_reg, u32 value)
147 {
148 + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
149 + struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
150 u16 ret;
151 int shift = (spec_reg & 0x2) * 8;
152  
153 @@ -94,6 +115,12 @@ static u16 esdhc_readw_fixup(struct sdhc
154 ret = value & 0xffff;
155 else
156 ret = (value >> shift) & 0xffff;
157 + /* Workaround for T4240-R1.0-R2.0 eSDHC which has incorrect
158 + * vendor version and spec version information.
159 + */
160 + if ((spec_reg == SDHCI_HOST_VERSION) &&
161 + (esdhc->quirk_incorrect_hostver))
162 + ret = (VENDOR_V_23 << SDHCI_VENDOR_VER_SHIFT) | SDHCI_SPEC_200;
163 return ret;
164 }
165  
166 @@ -235,7 +262,11 @@ static u32 esdhc_be_readl(struct sdhci_h
167 u32 ret;
168 u32 value;
169  
170 - value = ioread32be(host->ioaddr + reg);
171 + if (reg == SDHCI_CAPABILITIES_1)
172 + value = ioread32be(host->ioaddr + ESDHC_CAPABILITIES_1);
173 + else
174 + value = ioread32be(host->ioaddr + reg);
175 +
176 ret = esdhc_readl_fixup(host, reg, value);
177  
178 return ret;
179 @@ -246,7 +277,11 @@ static u32 esdhc_le_readl(struct sdhci_h
180 u32 ret;
181 u32 value;
182  
183 - value = ioread32(host->ioaddr + reg);
184 + if (reg == SDHCI_CAPABILITIES_1)
185 + value = ioread32(host->ioaddr + ESDHC_CAPABILITIES_1);
186 + else
187 + value = ioread32(host->ioaddr + reg);
188 +
189 ret = esdhc_readl_fixup(host, reg, value);
190  
191 return ret;
192 @@ -404,15 +439,25 @@ static int esdhc_of_enable_dma(struct sd
193 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
194 {
195 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
196 + struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
197  
198 - return pltfm_host->clock;
199 + if (esdhc->peripheral_clock)
200 + return esdhc->peripheral_clock;
201 + else
202 + return pltfm_host->clock;
203 }
204  
205 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
206 {
207 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
208 + struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
209 + unsigned int clock;
210  
211 - return pltfm_host->clock / 256 / 16;
212 + if (esdhc->peripheral_clock)
213 + clock = esdhc->peripheral_clock;
214 + else
215 + clock = pltfm_host->clock;
216 + return clock / 256 / 16;
217 }
218  
219 static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
220 @@ -421,12 +466,15 @@ static void esdhc_of_set_clock(struct sd
221 struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
222 int pre_div = 1;
223 int div = 1;
224 + ktime_t timeout;
225 u32 temp;
226  
227 host->mmc->actual_clock = 0;
228  
229 - if (clock == 0)
230 + if (clock == 0) {
231 + esdhc_clock_enable(host, false);
232 return;
233 + }
234  
235 /* Workaround to start pre_div at 2 for VNN < VENDOR_V_23 */
236 if (esdhc->vendor_ver < VENDOR_V_23)
237 @@ -454,9 +502,15 @@ static void esdhc_of_set_clock(struct sd
238 clock -= 5000000;
239 }
240  
241 + /* Workaround to reduce the clock frequency for ls1021a esdhc */
242 + if (of_find_compatible_node(NULL, NULL, "fsl,ls1021a-esdhc")) {
243 + if (clock == 50000000)
244 + clock = 46500000;
245 + }
246 +
247 temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
248 - temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
249 - | ESDHC_CLOCK_MASK);
250 + temp &= ~(ESDHC_CLOCK_SDCLKEN | ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN |
251 + ESDHC_CLOCK_PEREN | ESDHC_CLOCK_MASK);
252 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
253  
254 while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
255 @@ -476,7 +530,20 @@ static void esdhc_of_set_clock(struct sd
256 | (div << ESDHC_DIVIDER_SHIFT)
257 | (pre_div << ESDHC_PREDIV_SHIFT));
258 sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
259 - mdelay(1);
260 +
261 + /* Wait max 20 ms */
262 + timeout = ktime_add_ms(ktime_get(), 20);
263 + while (!(sdhci_readl(host, ESDHC_PRSSTAT) & ESDHC_CLOCK_STABLE)) {
264 + if (ktime_after(ktime_get(), timeout)) {
265 + pr_err("%s: Internal clock never stabilised.\n",
266 + mmc_hostname(host->mmc));
267 + return;
268 + }
269 + udelay(10);
270 + }
271 +
272 + temp |= ESDHC_CLOCK_SDCLKEN;
273 + sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
274 }
275  
276 static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
277 @@ -501,12 +568,136 @@ static void esdhc_pltfm_set_bus_width(st
278 sdhci_writel(host, ctrl, ESDHC_PROCTL);
279 }
280  
281 +static void esdhc_clock_enable(struct sdhci_host *host, bool enable)
282 +{
283 + u32 val;
284 + ktime_t timeout;
285 +
286 + val = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
287 +
288 + if (enable)
289 + val |= ESDHC_CLOCK_SDCLKEN;
290 + else
291 + val &= ~ESDHC_CLOCK_SDCLKEN;
292 +
293 + sdhci_writel(host, val, ESDHC_SYSTEM_CONTROL);
294 +
295 + /* Wait max 20 ms */
296 + timeout = ktime_add_ms(ktime_get(), 20);
297 + val = ESDHC_CLOCK_STABLE;
298 + while (!(sdhci_readl(host, ESDHC_PRSSTAT) & val)) {
299 + if (ktime_after(ktime_get(), timeout)) {
300 + pr_err("%s: Internal clock never stabilised.\n",
301 + mmc_hostname(host->mmc));
302 + break;
303 + }
304 + udelay(10);
305 + }
306 +}
307 +
308 static void esdhc_reset(struct sdhci_host *host, u8 mask)
309 {
310 + u32 val;
311 +
312 sdhci_reset(host, mask);
313  
314 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
315 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
316 +
317 + if (mask & SDHCI_RESET_ALL) {
318 + val = sdhci_readl(host, ESDHC_TBCTL);
319 + val &= ~ESDHC_TB_EN;
320 + sdhci_writel(host, val, ESDHC_TBCTL);
321 + }
322 +}
323 +
324 +/* The SCFG, Supplemental Configuration Unit, provides SoC specific
325 + * configuration and status registers for the device. There is a
326 + * SDHC IO VSEL control register on SCFG for some platforms. It's
327 + * used to support SDHC IO voltage switching.
328 + */
329 +static const struct of_device_id scfg_device_ids[] = {
330 + { .compatible = "fsl,t1040-scfg", },
331 + { .compatible = "fsl,ls1012a-scfg", },
332 + { .compatible = "fsl,ls1046a-scfg", },
333 + {}
334 +};
335 +
336 +/* SDHC IO VSEL control register definition */
337 +#define SCFG_SDHCIOVSELCR 0x408
338 +#define SDHCIOVSELCR_TGLEN 0x80000000
339 +#define SDHCIOVSELCR_VSELVAL 0x60000000
340 +#define SDHCIOVSELCR_SDHC_VS 0x00000001
341 +
342 +static int esdhc_signal_voltage_switch(struct mmc_host *mmc,
343 + struct mmc_ios *ios)
344 +{
345 + struct sdhci_host *host = mmc_priv(mmc);
346 + struct device_node *scfg_node;
347 + void __iomem *scfg_base = NULL;
348 + u32 sdhciovselcr;
349 + u32 val;
350 +
351 + /*
352 + * Signal Voltage Switching is only applicable for Host Controllers
353 + * v3.00 and above.
354 + */
355 + if (host->version < SDHCI_SPEC_300)
356 + return 0;
357 +
358 + val = sdhci_readl(host, ESDHC_PROCTL);
359 +
360 + switch (ios->signal_voltage) {
361 + case MMC_SIGNAL_VOLTAGE_330:
362 + val &= ~ESDHC_VOLT_SEL;
363 + sdhci_writel(host, val, ESDHC_PROCTL);
364 + return 0;
365 + case MMC_SIGNAL_VOLTAGE_180:
366 + scfg_node = of_find_matching_node(NULL, scfg_device_ids);
367 + if (scfg_node)
368 + scfg_base = of_iomap(scfg_node, 0);
369 + if (scfg_base) {
370 + sdhciovselcr = SDHCIOVSELCR_TGLEN |
371 + SDHCIOVSELCR_VSELVAL;
372 + iowrite32be(sdhciovselcr,
373 + scfg_base + SCFG_SDHCIOVSELCR);
374 +
375 + val |= ESDHC_VOLT_SEL;
376 + sdhci_writel(host, val, ESDHC_PROCTL);
377 + mdelay(5);
378 +
379 + sdhciovselcr = SDHCIOVSELCR_TGLEN |
380 + SDHCIOVSELCR_SDHC_VS;
381 + iowrite32be(sdhciovselcr,
382 + scfg_base + SCFG_SDHCIOVSELCR);
383 + iounmap(scfg_base);
384 + } else {
385 + val |= ESDHC_VOLT_SEL;
386 + sdhci_writel(host, val, ESDHC_PROCTL);
387 + }
388 + return 0;
389 + default:
390 + return 0;
391 + }
392 +}
393 +
394 +static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
395 +{
396 + struct sdhci_host *host = mmc_priv(mmc);
397 + u32 val;
398 +
399 + /* Use tuning block for tuning procedure */
400 + esdhc_clock_enable(host, false);
401 + val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
402 + val |= ESDHC_FLUSH_ASYNC_FIFO;
403 + sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
404 +
405 + val = sdhci_readl(host, ESDHC_TBCTL);
406 + val |= ESDHC_TB_EN;
407 + sdhci_writel(host, val, ESDHC_TBCTL);
408 + esdhc_clock_enable(host, true);
409 +
410 + return sdhci_execute_tuning(mmc, opcode);
411 }
412  
413 #ifdef CONFIG_PM_SLEEP
414 @@ -589,10 +780,19 @@ static const struct sdhci_pltfm_data sdh
415 .ops = &sdhci_esdhc_le_ops,
416 };
417  
418 +static struct soc_device_attribute soc_incorrect_hostver[] = {
419 + { .family = "QorIQ T4240", .revision = "1.0", },
420 + { .family = "QorIQ T4240", .revision = "2.0", },
421 + { },
422 +};
423 +
424 static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
425 {
426 struct sdhci_pltfm_host *pltfm_host;
427 struct sdhci_esdhc *esdhc;
428 + struct device_node *np;
429 + struct clk *clk;
430 + u32 val;
431 u16 host_ver;
432  
433 pltfm_host = sdhci_priv(host);
434 @@ -602,6 +802,36 @@ static void esdhc_init(struct platform_d
435 esdhc->vendor_ver = (host_ver & SDHCI_VENDOR_VER_MASK) >>
436 SDHCI_VENDOR_VER_SHIFT;
437 esdhc->spec_ver = host_ver & SDHCI_SPEC_VER_MASK;
438 + if (soc_device_match(soc_incorrect_hostver))
439 + esdhc->quirk_incorrect_hostver = true;
440 + else
441 + esdhc->quirk_incorrect_hostver = false;
442 +
443 + np = pdev->dev.of_node;
444 + clk = of_clk_get(np, 0);
445 + if (!IS_ERR(clk)) {
446 + /*
447 + * esdhc->peripheral_clock would be assigned with a value
448 + * which is eSDHC base clock when use periperal clock.
449 + * For ls1046a, the clock value got by common clk API is
450 + * peripheral clock while the eSDHC base clock is 1/2
451 + * peripheral clock.
452 + */
453 + if (of_device_is_compatible(np, "fsl,ls1046a-esdhc"))
454 + esdhc->peripheral_clock = clk_get_rate(clk) / 2;
455 + else
456 + esdhc->peripheral_clock = clk_get_rate(clk);
457 +
458 + clk_put(clk);
459 + }
460 +
461 + if (esdhc->peripheral_clock) {
462 + esdhc_clock_enable(host, false);
463 + val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
464 + val |= ESDHC_PERIPHERAL_CLK_SEL;
465 + sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
466 + esdhc_clock_enable(host, true);
467 + }
468 }
469  
470 static int sdhci_esdhc_probe(struct platform_device *pdev)
471 @@ -624,6 +854,11 @@ static int sdhci_esdhc_probe(struct plat
472 if (IS_ERR(host))
473 return PTR_ERR(host);
474  
475 + host->mmc_host_ops.start_signal_voltage_switch =
476 + esdhc_signal_voltage_switch;
477 + host->mmc_host_ops.execute_tuning = esdhc_execute_tuning;
478 + host->tuning_delay = 1;
479 +
480 esdhc_init(pdev, host);
481  
482 sdhci_get_of_property(pdev);
483 --- a/drivers/mmc/host/sdhci.c
484 +++ b/drivers/mmc/host/sdhci.c
485 @@ -1631,26 +1631,24 @@ static void sdhci_set_ios(struct mmc_hos
486  
487 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
488  
489 - if ((ios->timing == MMC_TIMING_SD_HS ||
490 - ios->timing == MMC_TIMING_MMC_HS)
491 - && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
492 - ctrl |= SDHCI_CTRL_HISPD;
493 - else
494 - ctrl &= ~SDHCI_CTRL_HISPD;
495 + if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
496 + if ((ios->timing == MMC_TIMING_SD_HS ||
497 + ios->timing == MMC_TIMING_MMC_HS ||
498 + ios->timing == MMC_TIMING_MMC_HS400 ||
499 + ios->timing == MMC_TIMING_MMC_HS200 ||
500 + ios->timing == MMC_TIMING_MMC_DDR52 ||
501 + ios->timing == MMC_TIMING_UHS_SDR50 ||
502 + ios->timing == MMC_TIMING_UHS_SDR104 ||
503 + ios->timing == MMC_TIMING_UHS_DDR50 ||
504 + ios->timing == MMC_TIMING_UHS_SDR25))
505 + ctrl |= SDHCI_CTRL_HISPD;
506 + else
507 + ctrl &= ~SDHCI_CTRL_HISPD;
508 + }
509  
510 if (host->version >= SDHCI_SPEC_300) {
511 u16 clk, ctrl_2;
512  
513 - /* In case of UHS-I modes, set High Speed Enable */
514 - if ((ios->timing == MMC_TIMING_MMC_HS400) ||
515 - (ios->timing == MMC_TIMING_MMC_HS200) ||
516 - (ios->timing == MMC_TIMING_MMC_DDR52) ||
517 - (ios->timing == MMC_TIMING_UHS_SDR50) ||
518 - (ios->timing == MMC_TIMING_UHS_SDR104) ||
519 - (ios->timing == MMC_TIMING_UHS_DDR50) ||
520 - (ios->timing == MMC_TIMING_UHS_SDR25))
521 - ctrl |= SDHCI_CTRL_HISPD;
522 -
523 if (!host->preset_enabled) {
524 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
525 /*
526 @@ -1963,7 +1961,7 @@ static int sdhci_prepare_hs400_tuning(st
527 return 0;
528 }
529  
530 -static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
531 +int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
532 {
533 struct sdhci_host *host = mmc_priv(mmc);
534 u16 ctrl;
535 @@ -2022,6 +2020,9 @@ static int sdhci_execute_tuning(struct m
536 return err;
537 }
538  
539 + if (host->tuning_delay < 0)
540 + host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
541 +
542 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
543 ctrl |= SDHCI_CTRL_EXEC_TUNING;
544 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
545 @@ -2134,9 +2135,10 @@ static int sdhci_execute_tuning(struct m
546  
547 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
548  
549 - /* eMMC spec does not require a delay between tuning cycles */
550 - if (opcode == MMC_SEND_TUNING_BLOCK)
551 - mdelay(1);
552 + /* Spec does not require a delay between tuning cycles */
553 + if (host->tuning_delay > 0)
554 + mdelay(host->tuning_delay);
555 +
556 } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
557  
558 /*
559 @@ -2172,6 +2174,7 @@ out_unlock:
560 spin_unlock_irqrestore(&host->lock, flags);
561 return err;
562 }
563 +EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
564  
565 static int sdhci_select_drive_strength(struct mmc_card *card,
566 unsigned int max_dtr, int host_drv,
567 @@ -3004,6 +3007,8 @@ struct sdhci_host *sdhci_alloc_host(stru
568  
569 host->flags = SDHCI_SIGNALING_330;
570  
571 + host->tuning_delay = -1;
572 +
573 return host;
574 }
575  
576 --- a/drivers/mmc/host/sdhci.h
577 +++ b/drivers/mmc/host/sdhci.h
578 @@ -524,6 +524,8 @@ struct sdhci_host {
579 #define SDHCI_TUNING_MODE_1 0
580 #define SDHCI_TUNING_MODE_2 1
581 #define SDHCI_TUNING_MODE_3 2
582 + /* Delay (ms) between tuning commands */
583 + int tuning_delay;
584  
585 unsigned long private[0] ____cacheline_aligned;
586 };
587 @@ -689,6 +691,7 @@ void sdhci_set_power_noreg(struct sdhci_
588 void sdhci_set_bus_width(struct sdhci_host *host, int width);
589 void sdhci_reset(struct sdhci_host *host, u8 mask);
590 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
591 +int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
592  
593 #ifdef CONFIG_PM
594 extern int sdhci_suspend_host(struct sdhci_host *host);