Hi Akash,
On Wed, Apr 15, 2020 at 03:53:12PM +0530, Akash Asthana wrote:
Add necessary macros and structure variables to support ICC BW
voting from individual SE drivers.
Signed-off-by: Akash Asthana <akashast@xxxxxxxxxxxxxx>
---
Changes in V2:
- As per Bjorn's comment dropped enums for ICC paths, given the three
paths individual members
Changes in V3:
- Add geni_icc_get, geni_icc_vote_on and geni_icc_vote_off as helper API.
- Add geni_icc_path structure in common header
Changes in V4:
- As per Bjorn's comment print error message in geni_icc_get if return
value is not -EPROBE_DEFER.
- As per Bjorn's comment remove NULL on path before calling icc_set_bw
API.
- As per Bjorn's comment drop __func__ print.
- As per Matthias's comment, make ICC path a array instead of individual
member entry in geni_se struct.
Note: I have ignored below check patch suggestion because it was throwing
compilation error as 'icc_ddr' is not compile time comstant.
WARNING: char * array declaration might be better as static const
- FILE: drivers/soc/qcom/qcom-geni-se.c:726:
- const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
drivers/soc/qcom/qcom-geni-se.c | 61 +++++++++++++++++++++++++++++++++++++++++
include/linux/qcom-geni-se.h | 31 +++++++++++++++++++++
2 files changed, 92 insertions(+)
diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index 7d622ea..1527bc4 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -720,6 +720,67 @@ void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
}
EXPORT_SYMBOL(geni_se_rx_dma_unprep);
+int geni_icc_get(struct geni_se *se, const char *icc_ddr)
+{
+ int i, icc_err;
+ const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
+
+ for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
+ if (!icc_names[i])
+ continue;
+
+ se->icc_paths[i].path = devm_of_icc_get(se->dev, icc_names[i]);
+ if (IS_ERR(se->icc_paths[i].path))
+ goto icc_get_failure;
+ }
+
+ return 0;
+
+icc_get_failure:
+ icc_err = PTR_ERR(se->icc_paths[i].path);
+ if (icc_err != -EPROBE_DEFER)
+ dev_err_ratelimited(se->dev, "Failed to get path:%d, ret:%d\n",
Better be explicit that it's an ICC path and log icc_names[i] instead of i.
+ i, icc_err);
+ return icc_err;
+
+}
+EXPORT_SYMBOL(geni_icc_get);
+
+int geni_icc_vote_on(struct geni_se *se)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
+ ret = icc_set_bw(se->icc_paths[i].path,
+ se->icc_paths[i].avg_bw, se->icc_paths[i].peak_bw);
I'll leave it to others to decide whether it's ok to leave the
implementation of the icc_enable/disable() APIs suggested on
https://patchwork.kernel.org/patch/11467511/#23269555 for later.
+ if (ret) {
+ dev_err_ratelimited(se->dev, "ICC BW voting failed on path:%d, ret:%d\n",
+ i, ret);
Instead of logging the index, which isn't very expressive, you could have
a static string array of the path names ({"core", "config", "ddr"} or
similar) that is used when logging errors in _vote_on/off().
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(geni_icc_vote_on);
+
+int geni_icc_vote_off(struct geni_se *se)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
+ ret = icc_set_bw(se->icc_paths[i].path, 0, 0);
+ if (ret) {
+ dev_err_ratelimited(se->dev, "ICC BW remove failed on path:%d, ret:%d\n",
+ i, ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(geni_icc_vote_off);
+
static int geni_se_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h
index dd46494..b5b9316 100644
--- a/include/linux/qcom-geni-se.h
+++ b/include/linux/qcom-geni-se.h
@@ -6,6 +6,8 @@
#ifndef _LINUX_QCOM_GENI_SE
#define _LINUX_QCOM_GENI_SE
+#include <linux/interconnect.h>
+
/* Transfer mode supported by GENI Serial Engines */
enum geni_se_xfer_mode {
GENI_SE_INVALID,
@@ -25,6 +27,12 @@ enum geni_se_protocol_type {
struct geni_wrapper;
struct clk;
+struct geni_icc_path {
+ struct icc_path *path;
+ unsigned int avg_bw;
+ unsigned int peak_bw;
+};
+
/**
* struct geni_se - GENI Serial Engine
* @base: Base Address of the Serial Engine's register block
@@ -33,6 +41,7 @@ struct clk;
* @clk: Handle to the core serial engine clock
* @num_clk_levels: Number of valid clock levels in clk_perf_tbl
* @clk_perf_tbl: Table of clock frequency input to serial engine clock
+ * @icc_paths: Array of ICC paths for SE
*/
struct geni_se {
void __iomem *base;
@@ -41,6 +50,7 @@ struct geni_se {
struct clk *clk;
unsigned int num_clk_levels;
unsigned long *clk_perf_tbl;
+ struct geni_icc_path icc_paths[3];
You also need enums for the paths, otherwise you end up with code like
this, which isn't really self-explanatory:
gi2c->se.icc_paths[0].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[1].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[2].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
(from "[V4,5/9] i2c: i2c-qcom-geni: Add interconnect support")
I know Bjorn asked in v1 to remove the enums you had, however it was
a slightly different context. If we are sticking to use an array of
'struct geni_icc_path' (which reduces redundant code) the enums are
'needed'.
