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mmc: sdhci-omap: Workaround for Errata i802

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Errata i802 in AM572x Sitara Processors Silicon Revision 2.0, 1.1
(SPRZ429K July 2014–Revised March 2017 [1]) mentions
DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
during the tuning procedure and it has to be disabled during the
tuning procedure Implement workaround for Errata i802 here..

[1] -> http://www.ti.com/lit/er/sprz429k/sprz429k.pdf

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kishon Vijay Abraham I 2018-02-05 18:20:18 +05:30 committed by Ulf Hansson
parent 9fc2cd7612
commit 7d33c35815
1 changed files with 13 additions and 0 deletions
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13
drivers/mmc/host/sdhci-omap.c
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@ -257,6 +257,7 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
u32 start_window = 0, max_window = 0;
u8 cur_match, prev_match = 0;
u32 length = 0, max_len = 0;
u32 ier = host->ier;
u32 phase_delay = 0;
int ret = 0;
u32 reg;
@ -277,6 +278,16 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
reg |= DLL_SWT;
sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg);
/*
* OMAP5/DRA74X/DRA72x Errata i802:
* DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur
* during the tuning procedure. So disable it during the
* tuning procedure.
*/
ier &= ~SDHCI_INT_DATA_CRC;
sdhci_writel(host, ier, SDHCI_INT_ENABLE);
sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
while (phase_delay <= MAX_PHASE_DELAY) {
sdhci_omap_set_dll(omap_host, phase_delay);
@ -322,6 +333,8 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
ret:
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
return ret;
}