| Message ID | 20220717035027.2135106-3-bjorn.andersson@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | i2c: qcom-geni: Make it possible to run i2cdetect | expand |
On 16-07-22, 20:50, Bjorn Andersson wrote: > Waiting for M_CMD_ABORT_EN in geni_i2c_abort_xfer() races with the > interrupt handler which will read and clear the abort bit, the result is > that every abort attempt takes 1 second and is followed by a message > about the abort having times out. > > Introduce a new state variable to carry the abort_done state from the > interrupt handler back to geni_i2c_abort_xfer(). Reviewed-by: Vinod Koul <vkoul@kernel.org>
On Sat, Jul 16, 2022 at 08:50:26PM -0700, Bjorn Andersson wrote: > Waiting for M_CMD_ABORT_EN in geni_i2c_abort_xfer() races with the > interrupt handler which will read and clear the abort bit, the result is > that every abort attempt takes 1 second and is followed by a message > about the abort having times out. > > Introduce a new state variable to carry the abort_done state from the > interrupt handler back to geni_i2c_abort_xfer(). > > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> > --- > drivers/i2c/busses/i2c-qcom-geni.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c > index 3bec7c782824..e212e7ae7ad2 100644 > --- a/drivers/i2c/busses/i2c-qcom-geni.c > +++ b/drivers/i2c/busses/i2c-qcom-geni.c > @@ -97,6 +97,7 @@ struct geni_i2c_dev { > struct dma_chan *tx_c; > struct dma_chan *rx_c; > bool gpi_mode; > + bool abort_done; > }; > > struct geni_i2c_err_log { > @@ -203,9 +204,14 @@ static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) > dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n", > gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags); > > - if (err != NACK && err != GENI_ABORT_DONE) { > + switch (err) { > + case GENI_ABORT_DONE: > + gi2c->abort_done = true; > + break; > + default: > dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg); > geni_i2c_err_misc(gi2c); > + break; > } > } > If I'm reading this right this changes the behavior on a NACK error now, right? Was that intentional? Otherwise looks good to me. > @@ -311,21 +317,21 @@ static irqreturn_t geni_i2c_irq(int irq, void *dev) > > static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c) > { > - u32 val; > unsigned long time_left = ABORT_TIMEOUT; > unsigned long flags; > > spin_lock_irqsave(&gi2c->lock, flags); > geni_i2c_err(gi2c, GENI_TIMEOUT); > gi2c->cur = NULL; > + gi2c->abort_done = false; > geni_se_abort_m_cmd(&gi2c->se); > spin_unlock_irqrestore(&gi2c->lock, flags); > + > do { > time_left = wait_for_completion_timeout(&gi2c->done, time_left); > - val = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS); > - } while (!(val & M_CMD_ABORT_EN) && time_left); > + } while (!gi2c->abort_done && time_left); > > - if (!(val & M_CMD_ABORT_EN)) > + if (!time_left) > dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n"); > } > > -- > 2.35.1 >
On Tue, Jul 19, 2022 at 03:50:54PM -0500, Andrew Halaney wrote: > On Sat, Jul 16, 2022 at 08:50:26PM -0700, Bjorn Andersson wrote: > > Waiting for M_CMD_ABORT_EN in geni_i2c_abort_xfer() races with the > > interrupt handler which will read and clear the abort bit, the result is > > that every abort attempt takes 1 second and is followed by a message > > about the abort having times out. > > > > Introduce a new state variable to carry the abort_done state from the > > interrupt handler back to geni_i2c_abort_xfer(). > > > > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> > > --- > > drivers/i2c/busses/i2c-qcom-geni.c | 16 +++++++++++----- > > 1 file changed, 11 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c > > index 3bec7c782824..e212e7ae7ad2 100644 > > --- a/drivers/i2c/busses/i2c-qcom-geni.c > > +++ b/drivers/i2c/busses/i2c-qcom-geni.c > > @@ -97,6 +97,7 @@ struct geni_i2c_dev { > > struct dma_chan *tx_c; > > struct dma_chan *rx_c; > > bool gpi_mode; > > + bool abort_done; > > }; > > > > struct geni_i2c_err_log { > > @@ -203,9 +204,14 @@ static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) > > dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n", > > gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags); > > > > - if (err != NACK && err != GENI_ABORT_DONE) { > > + switch (err) { > > + case GENI_ABORT_DONE: > > + gi2c->abort_done = true; > > + break; > > + default: > > dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg); > > geni_i2c_err_misc(gi2c); > > + break; > > } > > } > > > > If I'm reading this right this changes the behavior on a NACK error now, > right? Was that intentional? > > Otherwise looks good to me. > Hmmm (I should really review the whole series before hitting send :P ), it seems you cleaned the NACK stuff up in the next patch in the series. I guess one more thing, does this patch deserve a Fixes: tag? If so might be nice to make NACK not so loud in this patch in case it gets backported without the next patch. Thanks, Andrew > > @@ -311,21 +317,21 @@ static irqreturn_t geni_i2c_irq(int irq, void *dev) > > > > static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c) > > { > > - u32 val; > > unsigned long time_left = ABORT_TIMEOUT; > > unsigned long flags; > > > > spin_lock_irqsave(&gi2c->lock, flags); > > geni_i2c_err(gi2c, GENI_TIMEOUT); > > gi2c->cur = NULL; > > + gi2c->abort_done = false; > > geni_se_abort_m_cmd(&gi2c->se); > > spin_unlock_irqrestore(&gi2c->lock, flags); > > + > > do { > > time_left = wait_for_completion_timeout(&gi2c->done, time_left); > > - val = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS); > > - } while (!(val & M_CMD_ABORT_EN) && time_left); > > + } while (!gi2c->abort_done && time_left); > > > > - if (!(val & M_CMD_ABORT_EN)) > > + if (!time_left) > > dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n"); > > } > > > > -- > > 2.35.1 > >
> I guess one more thing, does this patch deserve a Fixes: tag? If so > might be nice to make NACK not so loud in this patch in case it gets > backported without the next patch. I squashed the two patches to keep the NACK behaviour and ease backporting.
On Sat, Jul 16, 2022 at 08:50:26PM -0700, Bjorn Andersson wrote: > Waiting for M_CMD_ABORT_EN in geni_i2c_abort_xfer() races with the > interrupt handler which will read and clear the abort bit, the result is > that every abort attempt takes 1 second and is followed by a message > about the abort having times out. > > Introduce a new state variable to carry the abort_done state from the > interrupt handler back to geni_i2c_abort_xfer(). > > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Applied to for-next, thanks!
diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 3bec7c782824..e212e7ae7ad2 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -97,6 +97,7 @@ struct geni_i2c_dev { struct dma_chan *tx_c; struct dma_chan *rx_c; bool gpi_mode; + bool abort_done; }; struct geni_i2c_err_log { @@ -203,9 +204,14 @@ static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n", gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags); - if (err != NACK && err != GENI_ABORT_DONE) { + switch (err) { + case GENI_ABORT_DONE: + gi2c->abort_done = true; + break; + default: dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg); geni_i2c_err_misc(gi2c); + break; } } @@ -311,21 +317,21 @@ static irqreturn_t geni_i2c_irq(int irq, void *dev) static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c) { - u32 val; unsigned long time_left = ABORT_TIMEOUT; unsigned long flags; spin_lock_irqsave(&gi2c->lock, flags); geni_i2c_err(gi2c, GENI_TIMEOUT); gi2c->cur = NULL; + gi2c->abort_done = false; geni_se_abort_m_cmd(&gi2c->se); spin_unlock_irqrestore(&gi2c->lock, flags); + do { time_left = wait_for_completion_timeout(&gi2c->done, time_left); - val = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS); - } while (!(val & M_CMD_ABORT_EN) && time_left); + } while (!gi2c->abort_done && time_left); - if (!(val & M_CMD_ABORT_EN)) + if (!time_left) dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n"); }
Waiting for M_CMD_ABORT_EN in geni_i2c_abort_xfer() races with the interrupt handler which will read and clear the abort bit, the result is that every abort attempt takes 1 second and is followed by a message about the abort having times out. Introduce a new state variable to carry the abort_done state from the interrupt handler back to geni_i2c_abort_xfer(). Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> --- drivers/i2c/busses/i2c-qcom-geni.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)