mirror of
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Main-line Linux kernel tree
http://www.kernel.org
76bfc7ccc2
In mmc_send_op_cond(), loops are continuously performed at the same interval of 10 ms. However the behaviour is not good for some eMMC which can be out from a busy state earlier than 10 ms if normal. Rather than fixing about the interval time in mmc_send_op_cond(), let's instead convert into using the common __mmc_poll_for_busy(). The reason for adjusting the interval time is that it is important to reduce the eMMC initialization time, especially in devices that use eMMC as rootfs. Test log(eMMC:KLM8G1GETF-B041): before: 12 ms (0.311016 - 0.298729) [ 0.295823] mmc0: starting CMD0 arg 00000000 flags 000000c0 [ 0.298729] mmc0: starting CMD1 arg 40000080 flags 000000e1<-start [ 0.311016] mmc0: starting CMD1 arg 40000080 flags 000000e1<-finish [ 0.311336] mmc0: starting CMD2 arg 00000000 flags 00000007 after: 2 ms (0.301270 - 0.298762) [ 0.295862] mmc0: starting CMD0 arg 00000000 flags 000000c0 [ 0.298762] mmc0: starting CMD1 arg 40000080 flags 000000e1<-start [ 0.299067] mmc0: starting CMD1 arg 40000080 flags 000000e1 [ 0.299441] mmc0: starting CMD1 arg 40000080 flags 000000e1 [ 0.299879] mmc0: starting CMD1 arg 40000080 flags 000000e1 [ 0.300446] mmc0: starting CMD1 arg 40000080 flags 000000e1 [ 0.301270] mmc0: starting CMD1 arg 40000080 flags 000000e1<-finish [ 0.301572] mmc0: starting CMD2 arg 00000000 flags 00000007 Signed-off-by: Huijin Park <huijin.park@samsung.com> Link: https://lore.kernel.org/r/20211104063231.2115-3-huijin.park@samsung.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
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| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| COPYING | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.