diff options
| author | Sowjanya Komatineni <skomatineni@nvidia.com> | 2019-03-24 07:45:19 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-04-15 12:55:54 +0300 |
| commit | 1d8cd065f7ab2992903f4611d8400ee794de0699 (patch) | |
| tree | 520333cfeec83fbf20f29b96d637f86c3dc28efe /drivers/mmc/host/sdhci.h | |
| parent | 92cd1667d579af5c3ef383680598a112da3695df (diff) | |
| download | linux-1d8cd065f7ab2992903f4611d8400ee794de0699.tar.xz | |
mmc: sdhci: allow host to specify maximum tuning loops
As per the Host Controller Standard Specification Version 4.20,
limitation of tuning iteration count is removed as PLL locking
time can be longer than UHS-1 tuning due to larger PVT fluctuation
and it will result in increase of tuning iteration to complete the
tuning.
This patch creates sdhci_host member tuning_loop_count to allow
hosts to specify maximum tuning iterations and also updates
execute_tuning to use this specified maximum tuning iteration count.
Default tuning_loop_count is set to same as existing loop count of
MAX_TUNING_LOOP which is 40 iterations.
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.h')
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 01002cba1359..57bb3e3dca89 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -596,6 +596,7 @@ struct sdhci_host { #define SDHCI_TUNING_MODE_3 2 /* Delay (ms) between tuning commands */ int tuning_delay; + int tuning_loop_count; /* Host SDMA buffer boundary. */ u32 sdma_boundary; |