Message ID | 1401687404-3806-1-git-send-email-hs@denx.de |
---|---|
State | Accepted |
Delegated to: | Jagannadha Sutradharudu Teki |
Headers | show |
On Mon, Jun 2, 2014 at 11:06 AM, Heiko Schocher <hs@denx.de> wrote: > if status register do never set MXC_CSPICTRL_TC, spi_xchg_single > endless loops. Add a timeout here to prevent endless hang. > > Signed-off-by: Heiko Schocher <hs@denx.de> > Cc: Dirk Behme <dirk.behme@gmail.com> > Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com> > > --- > - changes for v2: > - use timer api to poll till TC bit is set as Jagan Teki suggested > and make this timeout configurable through CONFIG_SYS_SPI_MXC_WAIT > --- > README | 4 ++++ > drivers/spi/mxc_spi.c | 18 ++++++++++++++++-- > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/README b/README > index a280435..ff8928b 100644 > --- a/README > +++ b/README > @@ -2564,6 +2564,10 @@ CBFS (Coreboot Filesystem) support > Enables the driver for the SPI controllers on i.MX and MXC > SoCs. Currently i.MX31/35/51 are supported. > > + CONFIG_SYS_SPI_MXC_WAIT > + Timeout for waiting until spi transfer completed. > + default: (CONFIG_SYS_HZ/100) /* 10 ms */ > + > - FPGA Support: CONFIG_FPGA > > Enables FPGA subsystem. > diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c > index f3f029d..4732850 100644 > --- a/drivers/spi/mxc_spi.c > +++ b/drivers/spi/mxc_spi.c > @@ -30,6 +30,10 @@ static unsigned long spi_bases[] = { > #define reg_read readl > #define reg_write(a, v) writel(v, a) > > +#if !defined(CONFIG_SYS_SPI_MXC_WAIT) > +#define CONFIG_SYS_SPI_MXC_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */ > +#endif > + > struct mxc_spi_slave { > struct spi_slave slave; > unsigned long base; > @@ -212,6 +216,8 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, > int nbytes = DIV_ROUND_UP(bitlen, 8); > u32 data, cnt, i; > struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; > + u32 ts; > + int status; > > debug("%s: bitlen %d dout 0x%x din 0x%x\n", > __func__, bitlen, (u32)dout, (u32)din); > @@ -272,9 +278,17 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, > reg_write(®s->ctrl, mxcs->ctrl_reg | > MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); > > + ts = get_timer(0); > + status = reg_read(®s->stat); > /* Wait until the TC (Transfer completed) bit is set */ > - while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0) > - ; > + while ((status & MXC_CSPICTRL_TC) == 0) { > + if (get_timer(ts) > CONFIG_SYS_SPI_MXC_WAIT) { > + printf("spi_xchg_single: Timeout!\n"); > + return -1; > + } > + udelay(10); > + status = reg_read(®s->stat); > + } > > /* Transfer completed, clear any pending request */ > reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); > -- > 1.8.3.1 > Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
On Sun, Jun 8, 2014 at 11:03 PM, Jagan Teki <jagannadh.teki@gmail.com> wrote: > On Mon, Jun 2, 2014 at 11:06 AM, Heiko Schocher <hs@denx.de> wrote: >> if status register do never set MXC_CSPICTRL_TC, spi_xchg_single >> endless loops. Add a timeout here to prevent endless hang. >> >> Signed-off-by: Heiko Schocher <hs@denx.de> >> Cc: Dirk Behme <dirk.behme@gmail.com> >> Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com> >> >> --- >> - changes for v2: >> - use timer api to poll till TC bit is set as Jagan Teki suggested >> and make this timeout configurable through CONFIG_SYS_SPI_MXC_WAIT >> --- >> README | 4 ++++ >> drivers/spi/mxc_spi.c | 18 ++++++++++++++++-- >> 2 files changed, 20 insertions(+), 2 deletions(-) >> >> diff --git a/README b/README >> index a280435..ff8928b 100644 >> --- a/README >> +++ b/README >> @@ -2564,6 +2564,10 @@ CBFS (Coreboot Filesystem) support >> Enables the driver for the SPI controllers on i.MX and MXC >> SoCs. Currently i.MX31/35/51 are supported. >> >> + CONFIG_SYS_SPI_MXC_WAIT >> + Timeout for waiting until spi transfer completed. >> + default: (CONFIG_SYS_HZ/100) /* 10 ms */ >> + >> - FPGA Support: CONFIG_FPGA >> >> Enables FPGA subsystem. >> diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c >> index f3f029d..4732850 100644 >> --- a/drivers/spi/mxc_spi.c >> +++ b/drivers/spi/mxc_spi.c >> @@ -30,6 +30,10 @@ static unsigned long spi_bases[] = { >> #define reg_read readl >> #define reg_write(a, v) writel(v, a) >> >> +#if !defined(CONFIG_SYS_SPI_MXC_WAIT) >> +#define CONFIG_SYS_SPI_MXC_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */ >> +#endif >> + >> struct mxc_spi_slave { >> struct spi_slave slave; >> unsigned long base; >> @@ -212,6 +216,8 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, >> int nbytes = DIV_ROUND_UP(bitlen, 8); >> u32 data, cnt, i; >> struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; >> + u32 ts; >> + int status; >> >> debug("%s: bitlen %d dout 0x%x din 0x%x\n", >> __func__, bitlen, (u32)dout, (u32)din); >> @@ -272,9 +278,17 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, >> reg_write(®s->ctrl, mxcs->ctrl_reg | >> MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); >> >> + ts = get_timer(0); >> + status = reg_read(®s->stat); >> /* Wait until the TC (Transfer completed) bit is set */ >> - while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0) >> - ; >> + while ((status & MXC_CSPICTRL_TC) == 0) { >> + if (get_timer(ts) > CONFIG_SYS_SPI_MXC_WAIT) { >> + printf("spi_xchg_single: Timeout!\n"); >> + return -1; >> + } >> + udelay(10); >> + status = reg_read(®s->stat); >> + } >> >> /* Transfer completed, clear any pending request */ >> reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); >> -- >> 1.8.3.1 >> > > Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Tom, I guess this will goes along with the series, if not I will pick. Let me know for any. thanks!
diff --git a/README b/README index a280435..ff8928b 100644 --- a/README +++ b/README @@ -2564,6 +2564,10 @@ CBFS (Coreboot Filesystem) support Enables the driver for the SPI controllers on i.MX and MXC SoCs. Currently i.MX31/35/51 are supported. + CONFIG_SYS_SPI_MXC_WAIT + Timeout for waiting until spi transfer completed. + default: (CONFIG_SYS_HZ/100) /* 10 ms */ + - FPGA Support: CONFIG_FPGA Enables FPGA subsystem. diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index f3f029d..4732850 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -30,6 +30,10 @@ static unsigned long spi_bases[] = { #define reg_read readl #define reg_write(a, v) writel(v, a) +#if !defined(CONFIG_SYS_SPI_MXC_WAIT) +#define CONFIG_SYS_SPI_MXC_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */ +#endif + struct mxc_spi_slave { struct spi_slave slave; unsigned long base; @@ -212,6 +216,8 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, int nbytes = DIV_ROUND_UP(bitlen, 8); u32 data, cnt, i; struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; + u32 ts; + int status; debug("%s: bitlen %d dout 0x%x din 0x%x\n", __func__, bitlen, (u32)dout, (u32)din); @@ -272,9 +278,17 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); + ts = get_timer(0); + status = reg_read(®s->stat); /* Wait until the TC (Transfer completed) bit is set */ - while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0) - ; + while ((status & MXC_CSPICTRL_TC) == 0) { + if (get_timer(ts) > CONFIG_SYS_SPI_MXC_WAIT) { + printf("spi_xchg_single: Timeout!\n"); + return -1; + } + udelay(10); + status = reg_read(®s->stat); + } /* Transfer completed, clear any pending request */ reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF);
if status register do never set MXC_CSPICTRL_TC, spi_xchg_single endless loops. Add a timeout here to prevent endless hang. Signed-off-by: Heiko Schocher <hs@denx.de> Cc: Dirk Behme <dirk.behme@gmail.com> Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com> --- - changes for v2: - use timer api to poll till TC bit is set as Jagan Teki suggested and make this timeout configurable through CONFIG_SYS_SPI_MXC_WAIT --- README | 4 ++++ drivers/spi/mxc_spi.c | 18 ++++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-)