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-rw-r--r--drivers/firmware/xilinx/zynqmp.c27
-rw-r--r--drivers/soc/xilinx/xlnx_event_manager.c4
-rw-r--r--drivers/soc/xilinx/zynqmp_pm_domains.c2
-rw-r--r--include/linux/firmware/xlnx-zynqmp.h4
4 files changed, 33 insertions, 4 deletions
diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 129f68d7a6f5..acd83d29c866 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -738,8 +738,31 @@ EXPORT_SYMBOL_GPL(zynqmp_pm_get_pll_frac_data);
*/
int zynqmp_pm_set_sd_tapdelay(u32 node_id, u32 type, u32 value)
{
- return zynqmp_pm_invoke_fn(PM_IOCTL, node_id, IOCTL_SET_SD_TAPDELAY,
- type, value, NULL);
+ u32 reg = (type == PM_TAPDELAY_INPUT) ? SD_ITAPDLY : SD_OTAPDLYSEL;
+ u32 mask = (node_id == NODE_SD_0) ? GENMASK(15, 0) : GENMASK(31, 16);
+
+ if (value) {
+ return zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
+ IOCTL_SET_SD_TAPDELAY,
+ type, value, NULL);
+ }
+
+ /*
+ * Work around completely misdesigned firmware API on Xilinx ZynqMP.
+ * The IOCTL_SET_SD_TAPDELAY firmware call allows the caller to only
+ * ever set IOU_SLCR SD_ITAPDLY Register SD0_ITAPDLYENA/SD1_ITAPDLYENA
+ * bits, but there is no matching call to clear those bits. If those
+ * bits are not cleared, SDMMC tuning may fail.
+ *
+ * Luckily, there are PM_MMIO_READ/PM_MMIO_WRITE calls which seem to
+ * allow complete unrestricted access to all address space, including
+ * IOU_SLCR SD_ITAPDLY Register and all the other registers, access
+ * to which was supposed to be protected by the current firmware API.
+ *
+ * Use PM_MMIO_READ/PM_MMIO_WRITE to re-implement the missing counter
+ * part of IOCTL_SET_SD_TAPDELAY which clears SDx_ITAPDLYENA bits.
+ */
+ return zynqmp_pm_invoke_fn(PM_MMIO_WRITE, reg, mask, 0, 0, NULL);
}
EXPORT_SYMBOL_GPL(zynqmp_pm_set_sd_tapdelay);
diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
index 2de082765bef..c76381899ef4 100644
--- a/drivers/soc/xilinx/xlnx_event_manager.c
+++ b/drivers/soc/xilinx/xlnx_event_manager.c
@@ -116,8 +116,10 @@ static int xlnx_add_cb_for_notify_event(const u32 node_id, const u32 event, cons
INIT_LIST_HEAD(&eve_data->cb_list_head);
cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
- if (!cb_data)
+ if (!cb_data) {
+ kfree(eve_data);
return -ENOMEM;
+ }
cb_data->eve_cb = cb_fun;
cb_data->agent_data = data;
diff --git a/drivers/soc/xilinx/zynqmp_pm_domains.c b/drivers/soc/xilinx/zynqmp_pm_domains.c
index fcce2433bd6d..69d03ad4cf1e 100644
--- a/drivers/soc/xilinx/zynqmp_pm_domains.c
+++ b/drivers/soc/xilinx/zynqmp_pm_domains.c
@@ -227,7 +227,7 @@ static struct generic_pm_domain *zynqmp_gpd_xlate
goto done;
}
- /**
+ /*
* Add index in empty node_id of power domain list as no existing
* power domain found for current index.
*/
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index b986e267d149..eb88b4ba62f9 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -79,6 +79,10 @@
#define EVENT_ERROR_PSM_ERR1 (0x28108000U)
#define EVENT_ERROR_PSM_ERR2 (0x2810C000U)
+/* ZynqMP SD tap delay tuning */
+#define SD_ITAPDLY 0xFF180314
+#define SD_OTAPDLYSEL 0xFF180318
+
enum pm_api_cb_id {
PM_INIT_SUSPEND_CB = 30,
PM_ACKNOWLEDGE_CB = 31,