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| author | Mårten Lindahl <marten.lindahl@axis.com> | 2021-12-20 14:30:25 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-12-21 15:28:41 +0300 |
| commit | 25d5417a90fd44cefa9af670ca358cae2f184f8b (patch) | |
| tree | 27249ca9248f17414813d46427715b3f6a919145 /drivers/mmc/host/dw_mmc.h | |
| parent | 91e2ca227b4112640b2acb7a8698651ce814e93a (diff) | |
| download | linux-25d5417a90fd44cefa9af670ca358cae2f184f8b.tar.xz | |
mmc: dw_mmc: Add driver callbacks for data read timeout
Current dw_mci driver supports a TMOUT register which consists of a 24
bit field (TMOUT[31:8]) for the DATA_TIMEOUT. The maximum value of this
field is 0xFFFFFF, which with a 200MHz clock will give a full DRTO of:
0xFFFFFF / 200000000 => ~84 ms
However, the ARTPEC-8 SoC DWMMC IP version has a TMOUT register with an
extended DATA_TIMEOUT field, which supports longer timers for the DRTO.
In this version the DATA_TIMEOUT field is split into two, which with the
same 200MHz clock as above will allow a maximum timeout of:
((TMOUT[10:8] -1) * 0xFFFFFF + TMOUT[31:11] * 8) / 200000000 => ~587 ms
Add driver callbacks for implementation specific data timeout, and
implement callback functions for the ARTPEC-8 SoC.
Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211220113026.21129-4-marten.lindahl@axis.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/dw_mmc.h')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 771d5afa3136..0a85d05eaf12 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -556,6 +556,8 @@ struct dw_mci_slot { * @set_ios: handle bus specific extensions. * @parse_dt: parse implementation specific device tree properties. * @execute_tuning: implementation specific tuning procedure. + * @set_data_timeout: implementation specific timeout. + * @get_drto_clks: implementation specific cycle count for data read timeout. * * Provide controller implementation specific extensions. The usage of this * data structure is fully optional and usage of each member in this structure @@ -573,5 +575,8 @@ struct dw_mci_drv_data { struct mmc_ios *ios); int (*switch_voltage)(struct mmc_host *mmc, struct mmc_ios *ios); + void (*set_data_timeout)(struct dw_mci *host, + unsigned int timeout_ns); + u32 (*get_drto_clks)(struct dw_mci *host); }; #endif /* _DW_MMC_H_ */ |