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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2013-01-25 16:17:41 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2013-01-25 19:52:18 +0100 |
| commit | 40a333b0623ebb4f188f9fb2820ed873f3415e41 (patch) | |
| tree | b8033cc1e64f03d46213a4e62508b55602f35571 /drivers/mci/atmel_mci.c | |
| parent | 7bd476801a0c75ca655b1e2a1dba4039aadce4d4 (diff) | |
| download | barebox-40a333b0623ebb4f188f9fb2820ed873f3415e41.tar.gz barebox-40a333b0623ebb4f188f9fb2820ed873f3415e41.tar.xz | |
atmel_mci: rwproof is only needed up to IP version 0x200
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mci/atmel_mci.c')
| -rw-r--r-- | drivers/mci/atmel_mci.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mci/atmel_mci.c b/drivers/mci/atmel_mci.c index d5fdd1df81..bf0adb0ad0 100644 --- a/drivers/mci/atmel_mci.c +++ b/drivers/mci/atmel_mci.c @@ -28,6 +28,7 @@ #include "atmel-mci-regs.h" struct atmel_mci_caps { + bool has_rwproof; bool has_odd_clk_div; }; @@ -94,7 +95,13 @@ static void atmci_set_clk_rate(struct atmel_mci *host, dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n", host->bus_hz, clock_min, clkdiv); - host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF; + /* + * WRPROOF and RDPROOF prevent overruns/underruns by + * stopping the clock when the FIFO is full/empty. + * This state is not expected to last for long. + */ + if (host->caps.has_rwproof) + host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF; atmci_writel(host, ATMCI_MR, host->mode_reg); } @@ -470,6 +477,7 @@ static void atmci_get_cap(struct atmel_mci *host) case 0x400: case 0x300: case 0x200: + host->caps.has_rwproof = 1; case 0x100: case 0x0: break; |