mmc: sdhci-omap: Workaround for Errata i802

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>

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 36e0626d3de20fdea919fac7495b592cd50ee4dc..e24ae903f7badd90d89fe6a187407c646f62287d 100644 (file)
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -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 @@ tuning_error:
 
 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;
 }