From 5385edc50063a2175383ef5e90aa67fb6ab1beae Mon Sep 17 00:00:00 2001 From: Ville Syrjala Date: Sat, 14 Jun 2008 20:27:20 +0300 Subject: [PATCH] at91_mci: AT91SAM9260/9263 12 byte write erratum (v2) AT91SAM926[0/3] PDC must write at least 12 bytes. The code compiles and runs but the actual condition for this erratum did not trigger in my tests so it's unclear if it actually works as intended. Signed-off-by: Ville Syrjala Signed-off-by: Nicolas Ferre Signed-off-by: Pierre Ossman --- drivers/mmc/host/at91_mci.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c index e4d018b2fe9f..d3e96ff41428 100644 --- a/drivers/mmc/host/at91_mci.c +++ b/drivers/mmc/host/at91_mci.c @@ -198,9 +198,14 @@ static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data unsigned int len, i, size; unsigned *dmabuf = host->buffer; - size = host->total_length; + size = data->blksz * data->blocks; len = data->sg_len; + /* AT91SAM926[0/3] Data Write Operation and number of bytes erratum */ + if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) + if (host->total_length == 12) + memset(dmabuf, 0, 12); + /* * Just loop through all entries. Size might not * be the entire list though so make sure that @@ -222,9 +227,10 @@ static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data for (index = 0; index < (amount / 4); index++) *dmabuf++ = swab32(sgbuffer[index]); - } - else + } else { memcpy(dmabuf, sgbuffer, amount); + dmabuf += amount; + } kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ); @@ -417,7 +423,7 @@ static void at91_mci_update_bytes_xfered(struct at91mci_host *host) /* card is in IDLE mode now */ pr_debug("-> bytes_xfered %d, total_length = %d\n", data->bytes_xfered, host->total_length); - data->bytes_xfered = host->total_length; + data->bytes_xfered = data->blksz * data->blocks; } } } @@ -600,6 +606,13 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command * Handle a write */ host->total_length = block_length * blocks; + /* + * AT91SAM926[0/3] Data Write Operation and + * number of bytes erratum + */ + if (cpu_is_at91sam9260 () || cpu_is_at91sam9263()) + if (host->total_length < 12) + host->total_length = 12; host->buffer = dma_alloc_coherent(NULL, host->total_length, &host->physical_address, GFP_KERNEL); -- 2.39.2