PM: AVS: qcom-cpr: Use nvmem_cell_read_variable_le_u32()

Let's delete the private function cpr_read_efuse() since it does the
basically the same thing as the new API call
nvmem_cell_read_variable_le_u32().

Differences between the new API call and the old private function:
* less error printing (I assume this is OK).
* will give an error if the value doesn't fit in 32-bits (the old code
  would have truncated silently).

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Niklas Cassel <nks@flawful.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210521134437.v2.1.Id1c70158722750aec0673d60c12e46a9c66bbfed@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/soc/qcom/cpr.c b/drivers/soc/qcom/cpr.c
index b24cc77..4ce8e81 100644 (file)
--- a/drivers/soc/qcom/cpr.c
+++ b/drivers/soc/qcom/cpr.c
@@ -801,38 +801,6 @@ unlock:
        return ret;
 }
 
-static int cpr_read_efuse(struct device *dev, const char *cname, u32 *data)
-{
-       struct nvmem_cell *cell;
-       ssize_t len;
-       char *ret;
-       int i;
-
-       *data = 0;
-
-       cell = nvmem_cell_get(dev, cname);
-       if (IS_ERR(cell)) {
-               if (PTR_ERR(cell) != -EPROBE_DEFER)
-                       dev_err(dev, "undefined cell %s\n", cname);
-               return PTR_ERR(cell);
-       }
-
-       ret = nvmem_cell_read(cell, &len);
-       nvmem_cell_put(cell);
-       if (IS_ERR(ret)) {
-               dev_err(dev, "can't read cell %s\n", cname);
-               return PTR_ERR(ret);
-       }
-
-       for (i = 0; i < len; i++)
-               *data |= ret[i] << (8 * i);
-
-       kfree(ret);
-       dev_dbg(dev, "efuse read(%s) = %x, bytes %zd\n", cname, *data, len);
-
-       return 0;
-}
-
 static int
 cpr_populate_ring_osc_idx(struct cpr_drv *drv)
 {
@@ -843,8 +811,7 @@ cpr_populate_ring_osc_idx(struct cpr_drv *drv)
        int ret;
 
        for (; fuse < end; fuse++, fuses++) {
-               ret = cpr_read_efuse(drv->dev, fuses->ring_osc,
-                                    &data);
+               ret = nvmem_cell_read_variable_le_u32(drv->dev, fuses->ring_osc, &data);
                if (ret)
                        return ret;
                fuse->ring_osc_idx = data;
@@ -863,7 +830,7 @@ static int cpr_read_fuse_uV(const struct cpr_desc *desc,
        u32 bits = 0;
        int ret;
 
-       ret = cpr_read_efuse(drv->dev, init_v_efuse, &bits);
+       ret = nvmem_cell_read_variable_le_u32(drv->dev, init_v_efuse, &bits);
        if (ret)
                return ret;
 
@@ -932,7 +899,7 @@ static int cpr_fuse_corner_init(struct cpr_drv *drv)
                }
 
                /* Populate target quotient by scaling */
-               ret = cpr_read_efuse(drv->dev, fuses->quotient, &fuse->quot);
+               ret = nvmem_cell_read_variable_le_u32(drv->dev, fuses->quotient, &fuse->quot);
                if (ret)
                        return ret;
 
@@ -1001,7 +968,7 @@ static int cpr_calculate_scaling(const char *quot_offset,
        prev_fuse = fuse - 1;
 
        if (quot_offset) {
-               ret = cpr_read_efuse(drv->dev, quot_offset, &quot_diff);
+               ret = nvmem_cell_read_variable_le_u32(drv->dev, quot_offset, &quot_diff);
                if (ret)
                        return ret;
 
@@ -1701,7 +1668,7 @@ static int cpr_probe(struct platform_device *pdev)
         * initialized after attaching to the power domain,
         * since it depends on the CPU's OPP table.
         */
-       ret = cpr_read_efuse(dev, "cpr_fuse_revision", &cpr_rev);
+       ret = nvmem_cell_read_variable_le_u32(dev, "cpr_fuse_revision", &cpr_rev);
        if (ret)
                return ret;