| Message ID | 20180726151424.4bcecf41@xhacker.debian (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | solve SDHCI DWC MSHC 128MB DMA boundary limitation | expand |
Hi Jisheng,
I love your patch! Yet something to improve:
[auto build test ERROR on ulf.hansson-mmc/next]
[also build test ERROR on next-20180727]
[cannot apply to v4.18-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Jisheng-Zhang/solve-SDHCI-DWC-MSHC-128MB-DMA-boundary-limitation/20180728-234650
base: git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All error/warnings (new ones prefixed by >>):
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_adma_write_desc':
>> drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: error: 'SZ_128M' undeclared (first use in this function)
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: note: each undeclared identifier is reported only once for each function it appears in
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
In file included from include/linux/cache.h:5:0,
from include/linux/printk.h:9,
from include/linux/kernel.h:14,
from include/linux/clk.h:16,
from drivers/mmc/host/sdhci-of-dwcmshc.c:10:
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_probe':
drivers/mmc/host/sdhci-of-dwcmshc.c:82:39: error: 'SZ_128M' undeclared (first use in this function)
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^
include/uapi/linux/kernel.h:13:46: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
^
>> drivers/mmc/host/sdhci-of-dwcmshc.c:82:10: note: in expansion of macro 'DIV_ROUND_UP'
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^~~~~~~~~~~~
vim +/SZ_128M +18 drivers/mmc/host/sdhci-of-dwcmshc.c
> 10 #include <linux/clk.h>
11 #include <linux/mm.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14
15 #include "sdhci-pltfm.h"
16
17 #define BOUNDARY_OK(addr, len) \
> 18 ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
19
20 struct dwcmshc_priv {
21 struct clk *bus_clk;
22 };
23
24 /*
25 * if DMA addr spans 128MB boundary, we split the DMA transfer into two
26 * so that the DMA transfer doesn't exceed the boundary.
27 */
28 static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host,
29 void *desc, dma_addr_t addr,
30 int len, unsigned int cmd)
31 {
32 int tmplen, offset;
33
> 34 if (BOUNDARY_OK(addr, len) || !len)
35 return _sdhci_adma_write_desc(host, desc, addr, len, cmd);
36
37 offset = addr & (SZ_128M - 1);
38 tmplen = SZ_128M - offset;
39 _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
40
41 addr += tmplen;
42 len -= tmplen;
43 desc += host->desc_sz;
44 _sdhci_adma_write_desc(host, desc, addr, len, cmd);
45
46 return host->desc_sz * 2;
47 }
48
49 static const struct sdhci_ops sdhci_dwcmshc_ops = {
50 .set_clock = sdhci_set_clock,
51 .set_bus_width = sdhci_set_bus_width,
52 .set_uhs_signaling = sdhci_set_uhs_signaling,
53 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
54 .reset = sdhci_reset,
55 .adma_write_desc = dwcmshc_adma_write_desc,
56 };
57
58 static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = {
59 .ops = &sdhci_dwcmshc_ops,
60 .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
61 };
62
63 static int dwcmshc_probe(struct platform_device *pdev)
64 {
65 struct sdhci_pltfm_host *pltfm_host;
66 struct sdhci_host *host;
67 struct dwcmshc_priv *priv;
68 int err;
69 u32 extra;
70
71 host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata,
72 sizeof(struct dwcmshc_priv));
73 if (IS_ERR(host))
74 return PTR_ERR(host);
75
76 /*
77 * The DMA descriptor table number is calculated as the maximum
78 * number of segments times 2, to allow for an alignment
79 * descriptor for each segment, plus 1 for a nop end descriptor,
80 * plus extra number for cross 128M boundary handling.
81 */
> 82 extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
83 if (extra > SDHCI_MAX_SEGS)
84 extra = SDHCI_MAX_SEGS;
85 host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra;
86
87 pltfm_host = sdhci_priv(host);
88 priv = sdhci_pltfm_priv(pltfm_host);
89
90 pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
91 if (IS_ERR(pltfm_host->clk)) {
92 err = PTR_ERR(pltfm_host->clk);
93 dev_err(&pdev->dev, "failed to get core clk: %d\n", err);
94 goto free_pltfm;
95 }
96 err = clk_prepare_enable(pltfm_host->clk);
97 if (err)
98 goto free_pltfm;
99
100 priv->bus_clk = devm_clk_get(&pdev->dev, "bus");
101 if (!IS_ERR(priv->bus_clk))
102 clk_prepare_enable(priv->bus_clk);
103
104 err = mmc_of_parse(host->mmc);
105 if (err)
106 goto err_clk;
107
108 sdhci_get_of_property(pdev);
109
110 err = sdhci_add_host(host);
111 if (err)
112 goto err_clk;
113
114 return 0;
115
116 err_clk:
117 clk_disable_unprepare(pltfm_host->clk);
118 clk_disable_unprepare(priv->bus_clk);
119 free_pltfm:
120 sdhci_pltfm_free(pdev);
121 return err;
122 }
123
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Jisheng,
I love your patch! Yet something to improve:
[auto build test ERROR on ulf.hansson-mmc/next]
[also build test ERROR on next-20180727]
[cannot apply to v4.18-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Jisheng-Zhang/solve-SDHCI-DWC-MSHC-128MB-DMA-boundary-limitation/20180728-234650
base: git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next
config: mips-allmodconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=mips
All errors (new ones prefixed by >>):
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_adma_write_desc':
>> drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: error: 'SZ_128M' undeclared (first use in this function); did you mean 'PM_128K'?
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
drivers/mmc/host/sdhci-of-dwcmshc.c:18:12: note: each undeclared identifier is reported only once for each function it appears in
((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
^
drivers/mmc/host/sdhci-of-dwcmshc.c:34:6: note: in expansion of macro 'BOUNDARY_OK'
if (BOUNDARY_OK(addr, len) || !len)
^~~~~~~~~~~
In file included from include/linux/cache.h:5:0,
from arch/mips/include/asm/cpu-info.h:15,
from arch/mips/include/asm/cpu-features.h:13,
from arch/mips/include/asm/bitops.h:21,
from include/linux/bitops.h:38,
from include/linux/kernel.h:11,
from include/linux/clk.h:16,
from drivers/mmc/host/sdhci-of-dwcmshc.c:10:
drivers/mmc/host/sdhci-of-dwcmshc.c: In function 'dwcmshc_probe':
drivers/mmc/host/sdhci-of-dwcmshc.c:82:39: error: 'SZ_128M' undeclared (first use in this function); did you mean 'PM_128K'?
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^
include/uapi/linux/kernel.h:13:46: note: in definition of macro '__KERNEL_DIV_ROUND_UP'
#define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
^
drivers/mmc/host/sdhci-of-dwcmshc.c:82:10: note: in expansion of macro 'DIV_ROUND_UP'
extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE);
^~~~~~~~~~~~
vim +18 drivers/mmc/host/sdhci-of-dwcmshc.c
16
17 #define BOUNDARY_OK(addr, len) \
> 18 ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
19
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Hi Jisheng, On 26/07/18 08:14, Jisheng Zhang wrote: > When using DMA, if the DMA addr spans 128MB boundary, we have to split > the DMA transfer into two so that each one doesn't exceed the boundary. Out of interest, is the driver already setting its segment boundary mask appropriately? This sounds like the exact kind of hardware restriction that dma_parms is intended to describe, which scatterlist-generating code is *supposed* to already respect. Robin. > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> > --- > drivers/mmc/host/sdhci-of-dwcmshc.c | 42 +++++++++++++++++++++++++++++ > 1 file changed, 42 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > index 1b7cd144fb01..7e189514bc83 100644 > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > @@ -8,21 +8,51 @@ > */ > > #include <linux/clk.h> > +#include <linux/mm.h> > #include <linux/module.h> > #include <linux/of.h> > > #include "sdhci-pltfm.h" > > +#define BOUNDARY_OK(addr, len) \ > + ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) > + > struct dwcmshc_priv { > struct clk *bus_clk; > }; > > +/* > + * if DMA addr spans 128MB boundary, we split the DMA transfer into two > + * so that the DMA transfer doesn't exceed the boundary. > + */ > +static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host, > + void *desc, dma_addr_t addr, > + int len, unsigned int cmd) > +{ > + int tmplen, offset; > + > + if (BOUNDARY_OK(addr, len) || !len) > + return _sdhci_adma_write_desc(host, desc, addr, len, cmd); > + > + offset = addr & (SZ_128M - 1); > + tmplen = SZ_128M - offset; > + _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); > + > + addr += tmplen; > + len -= tmplen; > + desc += host->desc_sz; > + _sdhci_adma_write_desc(host, desc, addr, len, cmd); > + > + return host->desc_sz * 2; > +} > + > static const struct sdhci_ops sdhci_dwcmshc_ops = { > .set_clock = sdhci_set_clock, > .set_bus_width = sdhci_set_bus_width, > .set_uhs_signaling = sdhci_set_uhs_signaling, > .get_max_clock = sdhci_pltfm_clk_get_max_clock, > .reset = sdhci_reset, > + .adma_write_desc = dwcmshc_adma_write_desc, > }; > > static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { > @@ -36,12 +66,24 @@ static int dwcmshc_probe(struct platform_device *pdev) > struct sdhci_host *host; > struct dwcmshc_priv *priv; > int err; > + u32 extra; > > host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata, > sizeof(struct dwcmshc_priv)); > if (IS_ERR(host)) > return PTR_ERR(host); > > + /* > + * The DMA descriptor table number is calculated as the maximum > + * number of segments times 2, to allow for an alignment > + * descriptor for each segment, plus 1 for a nop end descriptor, > + * plus extra number for cross 128M boundary handling. > + */ > + extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE); > + if (extra > SDHCI_MAX_SEGS) > + extra = SDHCI_MAX_SEGS; > + host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra; > + > pltfm_host = sdhci_priv(host); > priv = sdhci_pltfm_priv(pltfm_host); > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Robin, On Mon, 30 Jul 2018 12:06:08 +0100 Robin Murphy wrote: > Hi Jisheng, > > On 26/07/18 08:14, Jisheng Zhang wrote: > > When using DMA, if the DMA addr spans 128MB boundary, we have to split > > the DMA transfer into two so that each one doesn't exceed the boundary. > > Out of interest, is the driver already setting its segment boundary mask > appropriately? This sounds like the exact kind of hardware restriction > that dma_parms is intended to describe, which scatterlist-generating > code is *supposed* to already respect. Thanks for the nice input. It may provide an elegant solution for this limitation. To simplify the situation, let's assume no iommu, only swiotlb. And the DDR is less than 4GB so swiotlb on arm64 doesn't init. There's no dma range limitation with the HW, the only limitation is boundary, while dma_capable() doesn't check the boundary mask, so if we taking this solution, we need to teach dma_capable() about the boundary mask, I'm not sure whether this is acceptable. Another problem is swiotlb initialization. When to init swiotlb, we dunno there's such boundary limitation HW. Is there any elegant solution for this problem? Thanks > > Robin. > > > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> > > --- > > drivers/mmc/host/sdhci-of-dwcmshc.c | 42 +++++++++++++++++++++++++++++ > > 1 file changed, 42 insertions(+) > > > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > > index 1b7cd144fb01..7e189514bc83 100644 > > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > > @@ -8,21 +8,51 @@ > > */ > > > > #include <linux/clk.h> > > +#include <linux/mm.h> > > #include <linux/module.h> > > #include <linux/of.h> > > > > #include "sdhci-pltfm.h" > > > > +#define BOUNDARY_OK(addr, len) \ > > + ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) > > + > > struct dwcmshc_priv { > > struct clk *bus_clk; > > }; > > > > +/* > > + * if DMA addr spans 128MB boundary, we split the DMA transfer into two > > + * so that the DMA transfer doesn't exceed the boundary. > > + */ > > +static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host, > > + void *desc, dma_addr_t addr, > > + int len, unsigned int cmd) > > +{ > > + int tmplen, offset; > > + > > + if (BOUNDARY_OK(addr, len) || !len) > > + return _sdhci_adma_write_desc(host, desc, addr, len, cmd); > > + > > + offset = addr & (SZ_128M - 1); > > + tmplen = SZ_128M - offset; > > + _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); > > + > > + addr += tmplen; > > + len -= tmplen; > > + desc += host->desc_sz; > > + _sdhci_adma_write_desc(host, desc, addr, len, cmd); > > + > > + return host->desc_sz * 2; > > +} > > + > > static const struct sdhci_ops sdhci_dwcmshc_ops = { > > .set_clock = sdhci_set_clock, > > .set_bus_width = sdhci_set_bus_width, > > .set_uhs_signaling = sdhci_set_uhs_signaling, > > .get_max_clock = sdhci_pltfm_clk_get_max_clock, > > .reset = sdhci_reset, > > + .adma_write_desc = dwcmshc_adma_write_desc, > > }; > > > > static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { > > @@ -36,12 +66,24 @@ static int dwcmshc_probe(struct platform_device *pdev) > > struct sdhci_host *host; > > struct dwcmshc_priv *priv; > > int err; > > + u32 extra; > > > > host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata, > > sizeof(struct dwcmshc_priv)); > > if (IS_ERR(host)) > > return PTR_ERR(host); > > > > + /* > > + * The DMA descriptor table number is calculated as the maximum > > + * number of segments times 2, to allow for an alignment > > + * descriptor for each segment, plus 1 for a nop end descriptor, > > + * plus extra number for cross 128M boundary handling. > > + */ > > + extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE); > > + if (extra > SDHCI_MAX_SEGS) > > + extra = SDHCI_MAX_SEGS; > > + host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra; > > + > > pltfm_host = sdhci_priv(host); > > priv = sdhci_pltfm_priv(pltfm_host); > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, 31 Jul 2018 11:29:24 +0800 Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote: > Hi Robin, > > On Mon, 30 Jul 2018 12:06:08 +0100 Robin Murphy wrote: > > > Hi Jisheng, > > > > On 26/07/18 08:14, Jisheng Zhang wrote: > > > When using DMA, if the DMA addr spans 128MB boundary, we have to split > > > the DMA transfer into two so that each one doesn't exceed the boundary. > > > > Out of interest, is the driver already setting its segment boundary mask > > appropriately? This sounds like the exact kind of hardware restriction > > that dma_parms is intended to describe, which scatterlist-generating > > code is *supposed* to already respect. > > Thanks for the nice input. It may provide an elegant solution for this > limitation. > > To simplify the situation, let's assume no iommu, only swiotlb. And > the DDR is less than 4GB so swiotlb on arm64 doesn't init. > > There's no dma range limitation with the HW, the only limitation > is boundary, while dma_capable() doesn't check the boundary mask, so if > we taking this solution, we need to teach dma_capable() about the boundary > mask, I'm not sure whether this is acceptable. > > Another problem is swiotlb initialization. When to init swiotlb, we dunno > there's such boundary limitation HW. Is there any elegant solution for > this problem? > One more problem is: swiotlb isn't available on all platforms, e.g arm? How to solve this SDHCI HW's limitation on arm soc w/o iommu? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index 1b7cd144fb01..7e189514bc83 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -8,21 +8,51 @@ */ #include <linux/clk.h> +#include <linux/mm.h> #include <linux/module.h> #include <linux/of.h> #include "sdhci-pltfm.h" +#define BOUNDARY_OK(addr, len) \ + ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) + struct dwcmshc_priv { struct clk *bus_clk; }; +/* + * if DMA addr spans 128MB boundary, we split the DMA transfer into two + * so that the DMA transfer doesn't exceed the boundary. + */ +static unsigned int dwcmshc_adma_write_desc(struct sdhci_host *host, + void *desc, dma_addr_t addr, + int len, unsigned int cmd) +{ + int tmplen, offset; + + if (BOUNDARY_OK(addr, len) || !len) + return _sdhci_adma_write_desc(host, desc, addr, len, cmd); + + offset = addr & (SZ_128M - 1); + tmplen = SZ_128M - offset; + _sdhci_adma_write_desc(host, desc, addr, tmplen, cmd); + + addr += tmplen; + len -= tmplen; + desc += host->desc_sz; + _sdhci_adma_write_desc(host, desc, addr, len, cmd); + + return host->desc_sz * 2; +} + static const struct sdhci_ops sdhci_dwcmshc_ops = { .set_clock = sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, .set_uhs_signaling = sdhci_set_uhs_signaling, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .reset = sdhci_reset, + .adma_write_desc = dwcmshc_adma_write_desc, }; static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { @@ -36,12 +66,24 @@ static int dwcmshc_probe(struct platform_device *pdev) struct sdhci_host *host; struct dwcmshc_priv *priv; int err; + u32 extra; host = sdhci_pltfm_init(pdev, &sdhci_dwcmshc_pdata, sizeof(struct dwcmshc_priv)); if (IS_ERR(host)) return PTR_ERR(host); + /* + * The DMA descriptor table number is calculated as the maximum + * number of segments times 2, to allow for an alignment + * descriptor for each segment, plus 1 for a nop end descriptor, + * plus extra number for cross 128M boundary handling. + */ + extra = DIV_ROUND_UP(totalram_pages, SZ_128M / PAGE_SIZE); + if (extra > SDHCI_MAX_SEGS) + extra = SDHCI_MAX_SEGS; + host->adma_table_num = SDHCI_MAX_SEGS * 2 + 1 + extra; + pltfm_host = sdhci_priv(host); priv = sdhci_pltfm_priv(pltfm_host);
When using DMA, if the DMA addr spans 128MB boundary, we have to split the DMA transfer into two so that each one doesn't exceed the boundary. Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> --- drivers/mmc/host/sdhci-of-dwcmshc.c | 42 +++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)