diff options
| author | Yangbo Lu <yangbo.lu@nxp.com> | 2019-12-12 10:52:19 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2020-01-16 13:45:54 +0300 |
| commit | 5b742232d707dd7f3da493b0ac54fe44ddfb4cb8 (patch) | |
| tree | 8a15494b43107fa91b8b7a10f61ac18394aba6fa | |
| parent | f3c2082508c0704673ba7dfcd424f2ac225cfbfd (diff) | |
| download | linux-5b742232d707dd7f3da493b0ac54fe44ddfb4cb8.tar.xz | |
mmc: sdhci-of-esdhc: update tuning erratum A-008171
There is an official update for eSDHC tuning erratum A-008171.
This patch is to implement the changes,
- Affect all revisions of SoC.
- Changes for tuning window checking.
- Hardware hits a new condition that tuning succeeds although
the eSDHC might not have tuned properly for type2 SoCs
(soc_tuning_erratum_type2[] array in driver). So check
tuning window after tuning succeeds.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20191212075219.48625-2-yangbo.lu@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-of-esdhc.c | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index 1bfd21105f5f..cc478950fedb 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -854,20 +854,20 @@ static int esdhc_signal_voltage_switch(struct mmc_host *mmc, } static struct soc_device_attribute soc_tuning_erratum_type1[] = { - { .family = "QorIQ T1023", .revision = "1.0", }, - { .family = "QorIQ T1040", .revision = "1.0", }, - { .family = "QorIQ T2080", .revision = "1.0", }, - { .family = "QorIQ LS1021A", .revision = "1.0", }, + { .family = "QorIQ T1023", }, + { .family = "QorIQ T1040", }, + { .family = "QorIQ T2080", }, + { .family = "QorIQ LS1021A", }, { }, }; static struct soc_device_attribute soc_tuning_erratum_type2[] = { - { .family = "QorIQ LS1012A", .revision = "1.0", }, - { .family = "QorIQ LS1043A", .revision = "1.*", }, - { .family = "QorIQ LS1046A", .revision = "1.0", }, - { .family = "QorIQ LS1080A", .revision = "1.0", }, - { .family = "QorIQ LS2080A", .revision = "1.0", }, - { .family = "QorIQ LA1575A", .revision = "1.0", }, + { .family = "QorIQ LS1012A", }, + { .family = "QorIQ LS1043A", }, + { .family = "QorIQ LS1046A", }, + { .family = "QorIQ LS1080A", }, + { .family = "QorIQ LS2080A", }, + { .family = "QorIQ LA1575A", }, { }, }; @@ -935,13 +935,13 @@ static void esdhc_prepare_sw_tuning(struct sdhci_host *host, u8 *window_start, /* Write 32'hFFFF_FFFF to IRQSTAT register */ sdhci_writel(host, 0xFFFFFFFF, SDHCI_INT_STATUS); - /* If TBSTAT[15:8]-TBSTAT[7:0] > 4 * div_ratio - * or TBSTAT[7:0]-TBSTAT[15:8] > 4 * div_ratio, + /* If TBSTAT[15:8]-TBSTAT[7:0] > (4 * div_ratio) + 2 + * or TBSTAT[7:0]-TBSTAT[15:8] > (4 * div_ratio) + 2, * then program TBPTR[TB_WNDW_END_PTR] = 4 * div_ratio * and program TBPTR[TB_WNDW_START_PTR] = 8 * div_ratio. */ - if (abs(start_ptr - end_ptr) > (4 * esdhc->div_ratio)) { + if (abs(start_ptr - end_ptr) > (4 * esdhc->div_ratio + 2)) { *window_start = 8 * esdhc->div_ratio; *window_end = 4 * esdhc->div_ratio; } else { @@ -1014,6 +1014,19 @@ static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) if (ret) break; + /* For type2 affected platforms of the tuning erratum, + * tuning may succeed although eSDHC might not have + * tuned properly. Need to check tuning window. + */ + if (esdhc->quirk_tuning_erratum_type2 && + !host->tuning_err) { + esdhc_tuning_window_ptr(host, &window_start, + &window_end); + if (abs(window_start - window_end) > + (4 * esdhc->div_ratio + 2)) + host->tuning_err = -EAGAIN; + } + /* If HW tuning fails and triggers erratum, * try workaround. */ |