Re: [PATCH V2 3/5] firmware: scm: Modify only the DLOAD bit in TCSR register for download mode

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On 01/02/2023 09:05, Poovendhan Selvaraj wrote:
Add support to read-modify-write TCSR register to modify only DLOAD bit.

Co-developed-by: Anusha Rao <quic_anusha@xxxxxxxxxxx>
Signed-off-by: Anusha Rao <quic_anusha@xxxxxxxxxxx>
Co-developed-by: Kathiravan Thirumoorthy <quic_kathirav@xxxxxxxxxxx>
Signed-off-by: Kathiravan Thirumoorthy <quic_kathirav@xxxxxxxxxxx>
Signed-off-by: Poovendhan Selvaraj <quic_poovendh@xxxxxxxxxxx>
---
  drivers/firmware/qcom_scm.c | 12 ++++++++----
  1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 2000323722bf..e3435587a72d 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -407,7 +407,7 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
  }
  EXPORT_SYMBOL(qcom_scm_set_remote_state);
-static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
+static int __qcom_scm_set_dload_mode(struct device *dev, u32 val, bool enable)
  {
  	struct qcom_scm_desc desc = {
  		.svc = QCOM_SCM_SVC_BOOT,
@@ -417,7 +417,7 @@ static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
  		.owner = ARM_SMCCC_OWNER_SIP,
  	};
- desc.args[1] = enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;
+	desc.args[1] = enable ? val | QCOM_SCM_BOOT_SET_DLOAD_MODE : 0;


It is not read-modify-write when enable == false, its just writing 0.

Is this intentional?


return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
  }
@@ -426,15 +426,19 @@ static void qcom_scm_set_download_mode(bool enable)
  {
  	bool avail;
  	int ret = 0;
+	u32 dload_addr_val;
avail = __qcom_scm_is_call_available(__scm->dev,
  					     QCOM_SCM_SVC_BOOT,
  					     QCOM_SCM_BOOT_SET_DLOAD_MODE);
+	ret = qcom_scm_io_readl(__scm->dload_mode_addr, &dload_addr_val);
+
  	if (avail) {
-		ret = __qcom_scm_set_dload_mode(__scm->dev, enable);
+		ret = __qcom_scm_set_dload_mode(__scm->dev, dload_addr_val, enable);
  	} else if (__scm->dload_mode_addr) {
  		ret = qcom_scm_io_writel(__scm->dload_mode_addr,
-				enable ? QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);
+				enable ? dload_addr_val |
+					QCOM_SCM_BOOT_SET_DLOAD_MODE : 0);

same here.


--srini

  	} else {
  		dev_err(__scm->dev,
  			"No available mechanism for setting download mode\n");



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