On Wed, Jan 27, 2021 at 06:46:17PM +0000, Suzuki K Poulose wrote:
> TRCSTALLCTLR register is only implemented if
>
> TRCIDR3.STALLCTL == 0b1
>
> Make sure the driver touches the register only it is implemented.
>
> Cc: [email protected]
> Cc: Mathieu Poirier <[email protected]>
> Cc: Mike Leach <[email protected]>
> Cc: Leo Yan <[email protected]>
> Signed-off-by: Suzuki K Poulose <[email protected]>
> ---
> Changes since v2:
> - Ignore STALLCTL for sysfs mode
> ---
> drivers/hwtracing/coresight/coresight-etm4x-core.c | 9 ++++++---
> drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 +-
> 2 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 473ab7480a36..5017d33ba4f5 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -306,7 +306,8 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
> etm4x_relaxed_write32(csa, 0x0, TRCAUXCTLR);
> etm4x_relaxed_write32(csa, config->eventctrl0, TRCEVENTCTL0R);
> etm4x_relaxed_write32(csa, config->eventctrl1, TRCEVENTCTL1R);
> - etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR);
> + if (drvdata->stallctl)
> + etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR);
> etm4x_relaxed_write32(csa, config->ts_ctrl, TRCTSCTLR);
> etm4x_relaxed_write32(csa, config->syncfreq, TRCSYNCPR);
> etm4x_relaxed_write32(csa, config->ccctlr, TRCCCCTLR);
> @@ -1463,7 +1464,8 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
> state->trcauxctlr = etm4x_read32(csa, TRCAUXCTLR);
> state->trceventctl0r = etm4x_read32(csa, TRCEVENTCTL0R);
> state->trceventctl1r = etm4x_read32(csa, TRCEVENTCTL1R);
> - state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR);
> + if (drvdata->stallctl)
> + state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR);
> state->trctsctlr = etm4x_read32(csa, TRCTSCTLR);
> state->trcsyncpr = etm4x_read32(csa, TRCSYNCPR);
> state->trcccctlr = etm4x_read32(csa, TRCCCCTLR);
> @@ -1575,7 +1577,8 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
> etm4x_relaxed_write32(csa, state->trcauxctlr, TRCAUXCTLR);
> etm4x_relaxed_write32(csa, state->trceventctl0r, TRCEVENTCTL0R);
> etm4x_relaxed_write32(csa, state->trceventctl1r, TRCEVENTCTL1R);
> - etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR);
> + if (drvdata->stallctl)
> + etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR);
> etm4x_relaxed_write32(csa, state->trctsctlr, TRCTSCTLR);
> etm4x_relaxed_write32(csa, state->trcsyncpr, TRCSYNCPR);
> etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR);
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> index b646d53a3133..0995a10790f4 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> @@ -389,7 +389,7 @@ static ssize_t mode_store(struct device *dev,
> config->eventctrl1 &= ~BIT(12);
>
> /* bit[8], Instruction stall bit */
> - if (config->mode & ETM_MODE_ISTALL_EN)
> + if ((config->mode & ETM_MODE_ISTALL_EN) && (drvdata->stallctl == true))
I have applied this patch.
> config->stall_ctrl |= BIT(8);
> else
> config->stall_ctrl &= ~BIT(8);
> --
> 2.24.1
>