From 25a122fd0d28b48782b9524a85895573e7ccf304 Mon Sep 17 00:00:00 2001 From: Timo Teras Date: Wed, 25 Oct 2006 09:37:41 +0300 Subject: MMC: Poll card status after rescanning cards Some broken cards seem to process CMD1 even in stand-by state. The result is that the card replies with ILLEGAL_COMMAND error for the next command sent after rescanning. Currently the next command is select card, which would return the error. But CMD7 does actually succeed and retries of the command will timeout. The workaround is to poll card status after CMD1 to clear the pending error. Signed-off-by: Timo Teras Signed-off-by: Pierre Ossman --- drivers/mmc/mmc.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index ee8863c..ec8168a 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1178,14 +1178,29 @@ static void mmc_rescan(void *data) { struct mmc_host *host = data; struct list_head *l, *n; + unsigned char power_mode; mmc_claim_host(host); - if (host->ios.power_mode == MMC_POWER_ON) + /* + * Check for removed cards and newly inserted ones. We check for + * removed cards first so we can intelligently re-select the VDD. + */ + power_mode = host->ios.power_mode; + if (power_mode == MMC_POWER_ON) mmc_check_cards(host); mmc_setup(host); + /* + * Some broken cards process CMD1 even in stand-by state. There is + * no reply, but an ILLEGAL_COMMAND error is cached and returned + * after next command. We poll for card status here to clear any + * possibly pending error. + */ + if (power_mode == MMC_POWER_ON) + mmc_check_cards(host); + if (!list_empty(&host->cards)) { /* * (Re-)calculate the fastest clock rate which the -- cgit v1.1 From 63ef731aa6a81e286de78dcc92241d123424ed39 Mon Sep 17 00:00:00 2001 From: Timo Teras Date: Thu, 2 Nov 2006 19:43:27 +0100 Subject: MMC: Do not set unsupported bits in OCR response The card might go to inactive state (according to specification), if there are unsupported bits set in the OCR. Signed-off-by: Timo Teras Signed-off-by: Pierre Ossman --- drivers/mmc/mmc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index ec8168a..766bc544 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -475,7 +475,7 @@ static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) if (bit) { bit -= 1; - ocr = 3 << bit; + ocr &= 3 << bit; host->ios.vdd = bit; mmc_set_ios(host); -- cgit v1.1