Request for an update on this.
Thanks, Jagan.
-----Original Message----- From: Jagannadha Sutradharudu Teki [mailto:jagannadha.sutradharudu- teki@xilinx.com] Sent: 21 May 2013 15:02 To: u-boot@lists.denx.de Cc: monstr@monstr.eu; Andy Fleming; Jagannadha Sutradharudu Teki Subject: [U-BOOT] mmc: sdhci: Enable 8-bit bus width only for 3.0 spec onwards
CAP register don't have any information for 8-bit buswidth support on 2.0 sdhci spec, only from 3.0 onwards bit[18] got this information.
Due to this misassignment in sdhci, mmc is setting 8-bit buswidth using mmc_set_bus_width even if controller doesn't support. Below change has code information. "mmc: Properly determine maximum supported bus width" (sha1: 7798f6dbd5e1a3030ed81a81da5dfb57c3307cac)
Bug log: <mmc plus and emmc cards)
zynq-uboot> mmcinfo Error detected in status(0x208100)! Device: zynq_sdhci Manufacturer ID: fe .....
So enable 8-bit support only for 3.0 spec using CAP and for below 3.0 assign mmc->host_caps = MMC_MODE_8BIT on respective platform driver if host have a support.
Signed-off-by: Jagannadha Sutradharudu Teki jaganna@xilinx.com
drivers/mmc/sdhci.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 1eaea04..c5631bf 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -486,8 +486,10 @@ int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk) mmc->voltages |= host->voltages;
mmc->host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz |MMC_MODE_4BIT;
if (caps & SDHCI_CAN_DO_8BIT)mmc->host_caps |= MMC_MODE_8BIT;
if ((host->version & SDHCI_SPEC_VER_MASK) >= SDHCI_SPEC_300) {if (caps & SDHCI_CAN_DO_8BIT)mmc->host_caps |= MMC_MODE_8BIT;} if (host->host_caps) mmc->host_caps |= host->host_caps;-- 1.7.4
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