Re: [PATCH 08/16] bus: mhi: core: Add support for downloading firmware over BHIe

Manivannan Sadhasivam
2020-01-29T06:56:57Z

On Tue, Jan 28, 2020 at 12:36:04PM -0700, Jeffrey Hugo wrote:
> On 1/23/2020 4:18 AM, Manivannan Sadhasivam wrote:
> > MHI supports downloading the device firmware over BHI/BHIe (Boot Host
> > Interface) protocol. Hence, this commit adds necessary helpers, which
> > will be called during device power up stage.
> >
> > This is based on the patch submitted by Sujeev Dias:
> > https://lkml.org/lkml/2018/7/9/989
> >
> > Signed-off-by: Sujeev Dias <sdias@codeaurora.org>
> > Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
> > [mani: splitted the data transfer patch and cleaned up for upstream]
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> > drivers/bus/mhi/core/boot.c | 268 ++++++++++++++++++++++++++++++++
> > drivers/bus/mhi/core/init.c | 1 +
> > drivers/bus/mhi/core/internal.h | 1 +
> > 3 files changed, 270 insertions(+)
> >
> > diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
> > index 0996f18c4281..36956fb6eff2 100644
> > --- a/drivers/bus/mhi/core/boot.c
> > +++ b/drivers/bus/mhi/core/boot.c
> > @@ -20,6 +20,121 @@
> > #include <linux/wait.h>
> > #include "internal.h"
> > +/* Download AMSS image to device */
>
> Nit: I don't feel like this comment really adds any value. I feel like it
> either should have more content, or be removed. What do you think?

Okay, I think it can be removed.

> > +static int mhi_fw_load_amss(struct mhi_controller *mhi_cntrl,
> > + const struct mhi_buf *mhi_buf)
> > +{
>
>
> > +/* Download SBL image to device */
>
> Same here. Comment seems self evident from the function name.

Ack.

> > +static int mhi_fw_load_sbl(struct mhi_controller *mhi_cntrl,
> > + dma_addr_t dma_addr,
> > + size_t size)
> > +{
> > + u32 tx_status, val, session_id;
> > + int i, ret;
> > + void __iomem *base = mhi_cntrl->bhi;
> > + rwlock_t *pm_lock = &mhi_cntrl->pm_lock;
> > + struct {
> > + char *name;
> > + u32 offset;
> > + } error_reg[] = {
> > + { "ERROR_CODE", BHI_ERRCODE },
> > + { "ERROR_DBG1", BHI_ERRDBG1 },
> > + { "ERROR_DBG2", BHI_ERRDBG2 },
> > + { "ERROR_DBG3", BHI_ERRDBG3 },
> > + { NULL },
> > + };
> > +
> > + read_lock_bh(pm_lock);
> > + if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) {
> > + read_unlock_bh(pm_lock);
> > + goto invalid_pm_state;
> > + }
> > +
> > + /* Start SBL download via BHI protocol */
>
> I'm wondering, what do you think about having a debug level message here
> that SBL is being loaded? I think it would be handy for looking into the
> device state.
>

Agree. will add.

> > + mhi_write_reg(mhi_cntrl, base, BHI_STATUS, 0);
> > + mhi_write_reg(mhi_cntrl, base, BHI_IMGADDR_HIGH,
> > + upper_32_bits(dma_addr));
> > + mhi_write_reg(mhi_cntrl, base, BHI_IMGADDR_LOW,
> > + lower_32_bits(dma_addr));
> > + mhi_write_reg(mhi_cntrl, base, BHI_IMGSIZE, size);
> > + session_id = prandom_u32() & BHI_TXDB_SEQNUM_BMSK;
> > + mhi_write_reg(mhi_cntrl, base, BHI_IMGTXDB, session_id);
> > + read_unlock_bh(pm_lock);
> > +
> > +
> > +static void mhi_firmware_copy(struct mhi_controller *mhi_cntrl,
> > + const struct firmware *firmware,
> > + struct image_info *img_info)
>
> Perhaps its just me, but the parameters on the second and third lines do not
> look aligned in the style used in the rest of the file.
>

Yep, will fix it.

Thanks,
Mani

>
> --
> Jeffrey Hugo
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.