diff options
Diffstat (limited to 'drivers/mmc/host/meson-mx-sdhc-mmc.c')
| -rw-r--r-- | drivers/mmc/host/meson-mx-sdhc-mmc.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/mmc/host/meson-mx-sdhc-mmc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c index 5c00958d7754..53e3f6a4245a 100644 --- a/drivers/mmc/host/meson-mx-sdhc-mmc.c +++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c @@ -586,10 +586,17 @@ static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data) cmd->data->flags & MMC_DATA_READ) { meson_mx_sdhc_wait_cmd_ready(host->mmc); + /* + * If MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH was + * previously 0x1 then it has to be set to 0x3. If it + * was 0x0 before then it has to be set to 0x2. Without + * this reading SD cards sometimes transfers garbage, + * which results in cards not being detected due to: + * unrecognised SCR structure version <random number> + */ val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, 2); - regmap_update_bits(host->regmap, MESON_SDHC_PDMA, - MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, val, val); } |