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| author | Marek Vasut <marex@denx.de> | 2014-10-22 21:56:01 +0200 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com> | 2014-10-27 22:37:03 +0530 |
| commit | 80d73338080c83e17fbf3f844052ec71d03ecd13 (patch) | |
| tree | 636e9c4eefe012c66d1072e1fc80f82e4115a978 /drivers | |
| parent | 37dcc130e0c804da6ad50bf273d0d737cfe9cf8f (diff) | |
| download | blackbird-obmc-uboot-80d73338080c83e17fbf3f844052ec71d03ecd13.tar.gz blackbird-obmc-uboot-80d73338080c83e17fbf3f844052ec71d03ecd13.zip | |
spi: altera: Zap endless loop
The driver contained an endless loop when waiting for TX completion,
this is a bad idea since if the hardware fails, the loop might spin
forever. Add timeout and handle it.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Pavel Machek <pavel@denx.de>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/altera_spi.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/spi/altera_spi.c b/drivers/spi/altera_spi.c index 373ce30a03..8e898b99c0 100644 --- a/drivers/spi/altera_spi.c +++ b/drivers/spi/altera_spi.c @@ -129,6 +129,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, uint bytes = bitlen / 8; const uchar *txp = dout; uchar *rxp = din; + uint32_t reg, start; debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__, slave->bus, slave->cs, bitlen, bytes, flags); @@ -154,8 +155,16 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, debug("%s: tx:%x ", __func__, d); writel(d, &altspi->regs->txdata); - while (!(readl(&altspi->regs->status) & ALTERA_SPI_STATUS_RRDY_MSK)) - ; + start = get_timer(0); + while (1) { + reg = readl(&altspi->regs->status); + if (reg & ALTERA_SPI_STATUS_RRDY_MSK) + break; + if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) { + printf("%s: Transmission timed out!\n", __func__); + goto done; + } + } d = readl(&altspi->regs->rxdata); if (rxp) |
