On 09/07/2013 17:52, Philip Rakity wrote:
On Jul 9, 2013, at 4:44 PM, Jeremie Samuel<jeremie.samuel.ext@xxxxxxxxxx> wrote:
Hi all,
Currently the sdhci driver does everything in the atomic context.
And what is worse, PIO transfers are made from the IRQ handler.
Some patches were already submitted to solve this issue. But there were
rejected because they involved new issues.
This set of patches is an evolution of an old patch from Anton Vorontsov.
I tried to fix all the problems involved by the patches. I tested it for
several time now with SD cards and SDIO.
So, this patch set reworks sdhci code to avoid atomic context,
almost completely.
Thanks,
Running DDR50, SDR104 or HS200 what is the performance impact ?
I've realised performance tests with iozone benchmark and the performance impact was approximatively 0.5%.
Jeremie Samuel
Jeremie Samuel (8):
sdhci: Turn timeout timer into delayed work
sdhci: Turn tuning timeout timer into delayed work
sdhci: Use work structs instead of tasklets
sdhci: Use threaded IRQ handler
sdhci: Delay led blinking
sdhci: Turn host->lock into a mutex
sdhci: Get rid of mdelay()s where it is safe and makes sense
sdhci: Use jiffies instead of a timeout counter
drivers/mmc/host/sdhci.c | 327 ++++++++++++++++++++++-----------------------
include/linux/mmc/sdhci.h | 13 +-
2 files changed, 168 insertions(+), 172 deletions(-)
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1.7.10.4
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