On 7/24/2023 2:11 PM, Komal Bajaj wrote:
Add LLCC support for multi channel DDR configuration
based on a feature register.
Signed-off-by: Komal Bajaj <quic_kbajaj@xxxxxxxxxxx>
---
drivers/soc/qcom/llcc-qcom.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index 321f8d2079f7..1d2b08dfecea 100644
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
@@ -997,6 +998,19 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev,
return ret;
}
+static int qcom_llcc_get_cfg_index(struct platform_device *pdev, u8 *cfg_index)
+{
+ int ret;
+
+ ret = nvmem_cell_read_u8(&pdev->dev, "multi-chan-ddr", cfg_index);
+ if (ret == -ENOENT || ret == -EOPNOTSUPP) {
+ *cfg_index = 0;
+ return 0;
+ }
+
+ return ret;
+}
+
static int qcom_llcc_remove(struct platform_device *pdev)
{
/* Set the global pointer to a error code to avoid referencing it */
@@ -1033,6 +1047,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
const struct qcom_llcc_config *cfg;
const struct llcc_slice_config *llcc_cfg;
u32 sz;
+ u8 cfg_index;
u32 version;
struct regmap *regmap;
@@ -1050,7 +1065,16 @@ static int qcom_llcc_probe(struct platform_device *pdev)
}
cfgs = of_device_get_match_data(&pdev->dev);
- cfg = &cfgs->llcc_config[0];
+ ret = qcom_llcc_get_cfg_index(pdev, &cfg_index);
+ if (ret)
alignment.. ?
-Mukesh
+ goto err;
+
+ if (cfg_index >= cfgs->num_cfgs) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ cfg = &cfgs->llcc_config[cfg_index];
ret = regmap_read(regmap, cfg->reg_offset[LLCC_COMMON_STATUS0], &num_banks);
if (ret)
