[PATCH 07/14] bus: mhi: core: Improve debug logs for loading firmware

[mani]

From: Bhaumik Bhatt <bbh...@codeaurora.org>

Add log messages to track boot flow errors and timeouts in SBL or AMSS
firmware loading to aid in debug.

Signed-off-by: Bhaumik Bhatt <bbh...@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jh...@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasi...@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasi...@linaro.org>
---
 drivers/bus/mhi/core/boot.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index cf6dc5a2361c..80e4d7609aaa 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -121,7 +121,8 @@ static int __mhi_download_rddm_in_panic(struct 
mhi_controller *mhi_cntrl)
                ee = mhi_get_exec_env(mhi_cntrl);
        }
 
-       dev_dbg(dev, "Waiting for image download completion, current EE: %s\n",
+       dev_dbg(dev,
+               "Waiting for RDDM image download via BHIe, current EE:%s\n",
                TO_MHI_EXEC_STR(ee));
 
        while (retry--) {
@@ -152,11 +153,14 @@ static int __mhi_download_rddm_in_panic(struct 
mhi_controller *mhi_cntrl)
 int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, bool in_panic)
 {
        void __iomem *base = mhi_cntrl->bhie;
+       struct device *dev = &mhi_cntrl->mhi_dev->dev;
        u32 rx_status;
 
        if (in_panic)
                return __mhi_download_rddm_in_panic(mhi_cntrl);
 
+       dev_dbg(dev, "Waiting for RDDM image download via BHIe\n");
+
        /* Wait for the image download to complete */
        wait_event_timeout(mhi_cntrl->state_event,
                           mhi_read_reg_field(mhi_cntrl, base,
@@ -174,6 +178,7 @@ static int mhi_fw_load_amss(struct mhi_controller 
*mhi_cntrl,
                            const struct mhi_buf *mhi_buf)
 {
        void __iomem *base = mhi_cntrl->bhie;
+       struct device *dev = &mhi_cntrl->mhi_dev->dev;
        rwlock_t *pm_lock = &mhi_cntrl->pm_lock;
        u32 tx_status, sequence_id;
        int ret;
@@ -184,6 +189,7 @@ static int mhi_fw_load_amss(struct mhi_controller 
*mhi_cntrl,
                return -EIO;
        }
 
+       dev_dbg(dev, "Starting AMSS download via BHIe\n");
        mhi_write_reg(mhi_cntrl, base, BHIE_TXVECADDR_HIGH_OFFS,
                      upper_32_bits(mhi_buf->dma_addr));
 
@@ -435,7 +441,12 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
                release_firmware(firmware);
 
        /* Error or in EDL mode, we're done */
-       if (ret || mhi_cntrl->ee == MHI_EE_EDL)
+       if (ret) {
+               dev_err(dev, "MHI did not load SBL, ret:%d\n", ret);
+               return;
+       }
+
+       if (mhi_cntrl->ee == MHI_EE_EDL)
                return;
 
        write_lock_irq(&mhi_cntrl->pm_lock);
@@ -463,8 +474,10 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
        if (!mhi_cntrl->fbc_download)
                return;
 
-       if (ret)
+       if (ret) {
+               dev_err(dev, "MHI did not enter READY state\n");
                goto error_read;
+       }
 
        /* Wait for the SBL event */
        ret = wait_event_timeout(mhi_cntrl->state_event,
@@ -482,6 +495,8 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
        ret = mhi_fw_load_amss(mhi_cntrl,
                               /* Vector table is the last entry */
                               &image_info->mhi_buf[image_info->entries - 1]);
+       if (ret)
+               dev_err(dev, "MHI did not load AMSS, ret:%d\n", ret);
 
        release_firmware(firmware);
 
-- 
2.26.GIT