diff options
| author | Doug Brown <doug@schmorgal.com> | 2023-01-16 11:43:56 -0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-01-24 11:56:41 +0100 |
| commit | 7f7a201ad1fcd916526d10b21685690a35aa8d7a (patch) | |
| tree | 976e576c53a02db25c314f751f746ed2623c7528 | |
| parent | e764395080184544aa963b0dead24c01d1ca3b0e (diff) | |
mmc: sdhci-pxav2: add register workaround for PXA168 silicon bug
The PXA168 has a documented silicon bug that results in a data abort
exception when accessing the SDHCI_HOST_VERSION register on SDH2 and
SDH4 through a 16-bit read. Implement the workaround described in the
errata, which performs a 32-bit read from a lower address instead. This
is safe to use on all four SDH peripherals.
Signed-off-by: Doug Brown <doug@schmorgal.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230116194401.20372-4-doug@schmorgal.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-pxav2.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pxav2.c b/drivers/mmc/host/sdhci-pxav2.c index 5707d597ecae..5e01dab94426 100644 --- a/drivers/mmc/host/sdhci-pxav2.c +++ b/drivers/mmc/host/sdhci-pxav2.c @@ -80,6 +80,15 @@ static void pxav2_reset(struct sdhci_host *host, u8 mask) } } +static u16 pxav1_readw(struct sdhci_host *host, int reg) +{ + /* Workaround for data abort exception on SDH2 and SDH4 on PXA168 */ + if (reg == SDHCI_HOST_VERSION) + return readl(host->ioaddr + SDHCI_HOST_VERSION - 2) >> 16; + + return readw(host->ioaddr + reg); +} + static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width) { u8 ctrl; @@ -107,6 +116,7 @@ struct sdhci_pxa_variant { }; static const struct sdhci_ops pxav1_sdhci_ops = { + .read_w = pxav1_readw, .set_clock = sdhci_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .set_bus_width = pxav2_mmc_set_bus_width, |