Messages in this thread Patch in this message | | | From | Pierre Ossman <> | Subject | [PATCH 19/21] [MMC] Quirk for broken reset | Date | Wed, 21 Jun 2006 16:26:41 +0200 |
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Some controllers fail to complete a reset unless you touch the clock register first.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> ---
drivers/mmc/sdhci.c | 29 +++++++++++++++++++++++++++-- 1 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 1a12427..617a588 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -32,9 +32,21 @@ static unsigned int debug_nodma = 0; static unsigned int debug_forcedma = 0; static unsigned int debug_quirks = 0; +#define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0) + static const struct pci_device_id pci_ids[] __devinitdata = { - /* handle any SD host controller */ - {PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)}, + { + .vendor = PCI_VENDOR_ID_RICOH, + .device = PCI_DEVICE_ID_RICOH_R5C822, + .subvendor = PCI_VENDOR_ID_IBM, + .subdevice = PCI_ANY_ID, + .driver_data = SDHCI_QUIRK_CLOCK_BEFORE_RESET, + }, + + { /* Generic SD host controller */ + PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00) + }, + { /* end: all zeroes */ }, }; @@ -808,6 +820,19 @@ static void sdhci_tasklet_finish(unsigne if ((mrq->cmd->error != MMC_ERR_NONE) || (mrq->data && ((mrq->data->error != MMC_ERR_NONE) || (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) { + + /* Some controllers need this kick or reset won't work here */ + if (host->chip->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) { + unsigned int clock; + + /* This is to force an update */ + clock = host->clock; + host->clock = 0; + sdhci_set_clock(host, clock); + } + + /* Spec says we should do both at the same time, but Ricoh + controllers do not like that. */ sdhci_reset(host, SDHCI_RESET_CMD); sdhci_reset(host, SDHCI_RESET_DATA); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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