Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 31 Jan 2024 09:39:47 +0800 | Subject | Re: [PATCH v5 05/10] coresight-tpda: Add support to configure CMB element | From | Tao Zhang <> |
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On 1/30/2024 8:35 PM, Suzuki K Poulose wrote: > On 30/01/2024 09:02, Tao Zhang wrote: >> Read the CMB element size from the device tree. Set the register >> bit that controls the CMB element size of the corresponding port. >> >> Reviewed-by: James Clark <james.clark@arm.com> >> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com> >> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com> >> --- >> drivers/hwtracing/coresight/coresight-tpda.c | 123 +++++++++++-------- >> drivers/hwtracing/coresight/coresight-tpda.h | 6 + >> 2 files changed, 79 insertions(+), 50 deletions(-) >> >> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c >> b/drivers/hwtracing/coresight/coresight-tpda.c >> index 4ac954f4bc13..fcddff3ded81 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpda.c >> +++ b/drivers/hwtracing/coresight/coresight-tpda.c >> @@ -18,6 +18,7 @@ >> #include "coresight-priv.h" >> #include "coresight-tpda.h" >> #include "coresight-trace-id.h" >> +#include "coresight-tpdm.h" >> DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda"); >> @@ -28,24 +29,57 @@ static bool coresight_device_is_tpdm(struct >> coresight_device *csdev) >> CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM); >> } >> +static void tpdm_clear_element_size(struct coresight_device *csdev) >> +{ >> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); >> + >> + drvdata->dsb_esize = 0; >> + drvdata->cmb_esize = 0; >> +} >> + >> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 >> *val) >> +{ >> + > > > >> + if (drvdata->dsb_esize == 64) >> + *val |= TPDA_Pn_CR_DSBSIZE; > > We don't seem to be clearing the fields we modify, before updating > them. This may be OK in real world where the device connected to TPDA > port > may not change. But it is always safer to clear the bits and set it. > > e.g.: > *val &= ~(TPDA_Pn_CR_DSBSIZE | TPDA_Pn_CR_CMBSIZE); > > > >> + else if (drvdata->dsb_esize == 32) >> + *val &= ~TPDA_Pn_CR_DSBSIZE; >> + >> + if (drvdata->cmb_esize == 64) >> + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2); >> + else if (drvdata->cmb_esize == 32) >> + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1); > > Similarly here ^^^. I am happy to fix it up if you are OK with it > (unless there are other changes that need a respin)
Thank you. I would be very grateful if you could help for this.
Best,
Tao
> >> + else if (drvdata->cmb_esize == 8) >> + *val &= ~TPDA_Pn_CR_CMBSIZE; >> +} > >> + >> /* >> - * Read the DSB element size from the TPDM device >> + * Read the element size from the TPDM device. One TPDM must have at >> least one of the >> + * element size property. >> * Returns >> - * The dsb element size read from the devicetree if available. >> - * 0 - Otherwise, with a warning once. >> + * 0 - The element size property is read >> + * Others - Cannot read the property of the element size >> */ >> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev) >> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata, >> + struct coresight_device *csdev) >> { >> - int rc = 0; >> - u8 size = 0; >> + int rc = -EINVAL; >> + struct tpdm_drvdata *tpdm_data = >> dev_get_drvdata(csdev->dev.parent); >> + >> + if (tpdm_has_dsb_dataset(tpdm_data)) { >> + rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent), >> + "qcom,dsb-element-size", &drvdata->dsb_esize); >> + } >> + if (tpdm_has_cmb_dataset(tpdm_data)) { >> + rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent), >> + "qcom,cmb-element-bits", &drvdata->cmb_esize); >> + } >> - rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent), >> - "qcom,dsb-element-size", &size); >> if (rc) >> dev_warn_once(&csdev->dev, >> - "Failed to read TPDM DSB Element size: %d\n", rc); >> + "Failed to read TPDM Element size: %d\n", rc); >> - return size; >> + return rc; >> } >> /* >> @@ -56,11 +90,12 @@ static int tpdm_read_dsb_element_size(struct >> coresight_device *csdev) >> * Parameter "inport" is used to pass in the input port number >> * of TPDA, and it is set to -1 in the recursize call. >> */ >> -static int tpda_get_element_size(struct coresight_device *csdev, >> +static int tpda_get_element_size(struct tpda_drvdata *drvdata, >> + struct coresight_device *csdev, >> int inport) >> { >> - int dsb_size = -ENOENT; >> - int i, size; >> + int rc = 0; >> + int i; >> struct coresight_device *in; >> for (i = 0; i < csdev->pdata->nr_inconns; i++) { >> @@ -69,30 +104,26 @@ static int tpda_get_element_size(struct >> coresight_device *csdev, >> continue; >> /* Ignore the paths that do not match port */ >> - if (inport > 0 && >> + if (inport >= 0 && > > That looks like a bug fix, but if you don't care about fixing this in > < v6.8, I don't mind. > > > Rest looks fine to me > > Suzuki >
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