Hello The problem was due to the missing both 8BIT and MMC_SPEED supports in my sdhci driver (comes from the 2.6.32 Kernel series). I've also added the patch in attachment. Best Regards Peppe On 8/24/2010 5:11 PM, Peppe CAVALLARO wrote: > > Hello, > testing the sdhci-stm.c driver, I sent some weeks ago to the mailing list, > I'm facing some performance issues. > For example, when copy a file (e.g. ~10MiB) to the card, I've noticed > that, > in the sdhci_prepare_data, the maximum value for data->blocks is 248. > > The sdhci-stm driver uses the ADMA and: > max_seg_size = 65536, > max_hw_segs = 128, > max_phys_segs = 128, > max_req_size = 524288, > max_blk_size = 2048, > max_blk_count = 65535. > > Using my arasan.c code, I've also sent to this mailing list in July, > I could see that the data->blocks was bigger than 248 and the > performances were better. > Note that this driver used the same mmc_host parameters (max_blk_size > etc.) reported > above for the sdhci-stm. > > What am I missing? > > Welcome advice. > > Best Regards, > Giuseppe > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html >
From b3427a938ed04febdaa729ca500f266274e06bd2 Mon Sep 17 00:00:00 2001 From: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx> Date: Tue, 31 Aug 2010 05:43:45 +0200 Subject: [PATCH (sh-2.6.32.y)] sdhci: add MMC_CAP_8_BIT_DATA in the Host capabilities Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx> --- drivers/mmc/host/sdhci.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 955cad9..1c49326 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1799,7 +1799,7 @@ int sdhci_add_host(struct sdhci_host *host) mmc->caps = MMC_CAP_SDIO_IRQ; if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) - mmc->caps |= MMC_CAP_4_BIT_DATA; + mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; if (caps & SDHCI_CAN_DO_HISPD) mmc->caps |= MMC_CAP_SD_HIGHSPEED; -- 1.5.5.6
