Re: [PATCH v3 1/5] firmware: qcom_scm: provide a read-modify-write function

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On 17/03/2023 16:27, Mukesh Ojha wrote:
It was released by Srinivas K. that there is a need of
read-modify-write scm exported function so that it can
be used by multiple clients.

Let's introduce qcom_scm_io_update_field() which masks
out the bits and write the passed value to that
bit-offset. Subsequent patch will use this function.

Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
---
  drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
  include/linux/firmware/qcom/qcom_scm.h |  2 ++
  2 files changed, 17 insertions(+)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 3e020d1..aca2556 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
  }
  EXPORT_SYMBOL(qcom_scm_set_remote_state);
+int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask, unsigned int val)
+{
+	unsigned int old, new;
+	int ret;
+
+	ret = qcom_scm_io_readl(addr, &old);
+	if (ret)
+		return ret;
+
+	new = (old & ~mask) | val;

thanks for doing this,

With field semantics, val should be shifted within the function, so the caller only sets value for field rather than passing a shifted value.
so this should be:

new = (old & ~mask) | (val << ffs(mask) - 1);


--srini



+
+	return qcom_scm_io_writel(addr, new);
+}
+EXPORT_SYMBOL(qcom_scm_io_update_field);
+
  static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
  {
  	struct qcom_scm_desc desc = {
diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
index 1e449a5..203a781 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -84,6 +84,8 @@ extern bool qcom_scm_pas_supported(u32 peripheral);
extern int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val);
  extern int qcom_scm_io_writel(phys_addr_t addr, unsigned int val);
+extern int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask,
+				    unsigned int val);
extern bool qcom_scm_restore_sec_cfg_available(void);
  extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);



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