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    SubjectRe: [PATCH v4 8/9] bus: mhi: core: Read and save device hardware information from BHI
    On Mon, Jun 29, 2020 at 09:39:41AM -0700, Bhaumik Bhatt wrote:
    > Device hardware specific information such as serial number and the OEM
    > PK hash can be read using BHI and saved on host to identify the
    > endpoint.
    >
    > Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
    > Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>

    Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

    Thanks,
    Mani

    > ---
    > drivers/bus/mhi/core/boot.c | 17 ++++++++++++++++-
    > include/linux/mhi.h | 6 ++++++
    > 2 files changed, 22 insertions(+), 1 deletion(-)
    >
    > diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
    > index 0b38014..24422f5 100644
    > --- a/drivers/bus/mhi/core/boot.c
    > +++ b/drivers/bus/mhi/core/boot.c
    > @@ -392,13 +392,28 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
    > void *buf;
    > dma_addr_t dma_addr;
    > size_t size;
    > - int ret;
    > + int i, ret;
    >
    > if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
    > dev_err(dev, "Device MHI is not in valid state\n");
    > return;
    > }
    >
    > + /* save hardware info from BHI */
    > + ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_SERIALNU,
    > + &mhi_cntrl->serial_number);
    > + if (ret)
    > + dev_err(dev, "Could not capture serial number via BHI\n");
    > +
    > + for (i = 0; i < ARRAY_SIZE(mhi_cntrl->oem_pk_hash); i++) {
    > + ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_OEMPKHASH(i),
    > + &mhi_cntrl->oem_pk_hash[i]);
    > + if (ret) {
    > + dev_err(dev, "Could not capture OEM PK HASH via BHI\n");
    > + break;
    > + }
    > + }
    > +
    > /* If device is in pass through, do reset to ready state transition */
    > if (mhi_cntrl->ee == MHI_EE_PTHRU)
    > goto fw_load_ee_pthru;
    > diff --git a/include/linux/mhi.h b/include/linux/mhi.h
    > index b1e8b4f..dad6246 100644
    > --- a/include/linux/mhi.h
    > +++ b/include/linux/mhi.h
    > @@ -16,6 +16,8 @@
    > #include <linux/wait.h>
    > #include <linux/workqueue.h>
    >
    > +#define MHI_MAX_OEM_PK_HASH_SEGMENTS 16
    > +
    > struct mhi_chan;
    > struct mhi_event;
    > struct mhi_ctxt;
    > @@ -315,6 +317,8 @@ struct mhi_controller_config {
    > * @device_number: MHI controller device number
    > * @major_version: MHI controller major revision number
    > * @minor_version: MHI controller minor revision number
    > + * @serial_number: MHI controller serial number obtained from BHI
    > + * @oem_pk_hash: MHI controller OEM PK Hash obtained from BHI
    > * @mhi_event: MHI event ring configurations table
    > * @mhi_cmd: MHI command ring configurations table
    > * @mhi_ctxt: MHI device context, shared memory between host and device
    > @@ -394,6 +398,8 @@ struct mhi_controller {
    > u32 device_number;
    > u32 major_version;
    > u32 minor_version;
    > + u32 serial_number;
    > + u32 oem_pk_hash[MHI_MAX_OEM_PK_HASH_SEGMENTS];
    >
    > struct mhi_event *mhi_event;
    > struct mhi_cmd *mhi_cmd;
    > --
    > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    > a Linux Foundation Collaborative Project
    >

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