Add support to dump testbus registers to enhance debugging capabilities
for the Qualcomm UFS Host Controller.
Signed-off-by: Manish Pandey <quic_mapa@xxxxxxxxxxx>
---
drivers/ufs/host/ufs-qcom.c | 50 +++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index fc9e8d0ddc92..85043db89b8c 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -5,6 +5,7 @@
#include <linux/acpi.h>
#include <linux/clk.h>
+#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/devfreq.h>
#include <linux/gpio/consumer.h>
@@ -96,6 +97,24 @@ static const struct __ufs_qcom_bw_table {
[MODE_MAX][0][0] = { 7643136, 819200 },
};
+static const struct {
+ int nminor;
+ char *prefix;
+} testbus_info[TSTBUS_MAX] = {
+ [TSTBUS_UAWM] = {32, "TSTBUS_UAWM"},
+ [TSTBUS_UARM] = {32, "TSTBUS_UARM"},
+ [TSTBUS_TXUC] = {32, "TSTBUS_TXUC"},
+ [TSTBUS_RXUC] = {32, "TSTBUS_RXUC"},
+ [TSTBUS_DFC] = {32, "TSTBUS_DFC"},
+ [TSTBUS_TRLUT] = {32, "TSTBUS_TRLUT"},
+ [TSTBUS_TMRLUT] = {32, "TSTBUS_TMRLUT"},
+ [TSTBUS_OCSC] = {32, "TSTBUS_OCSC"},
+ [TSTBUS_UTP_HCI] = {32, "TSTBUS_UTP_HCI"},
+ [TSTBUS_COMBINED] = {32, "TSTBUS_COMBINED"},
+ [TSTBUS_WRAPPER] = {32, "TSTBUS_WRAPPER"},
+ [TSTBUS_UNIPRO] = {256, "TSTBUS_UNIPRO"},
+};
+
static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host);
static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, bool is_scale_up);
@@ -1542,6 +1561,32 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
return 0;
}
+static void ufs_qcom_dump_testbus(struct ufs_hba *hba)
+{
+ struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+ int i, j, nminor = 0, testbus_len = 0;
+ u32 *testbus __free(kfree) = NULL;
+ char *prefix;
+
+ testbus = kmalloc_array(256, sizeof(u32), GFP_KERNEL);
+ if (!testbus)
+ return;
+
+ for (j = 0; j < TSTBUS_MAX; j++) {
+ nminor = testbus_info[j].nminor;
+ prefix = testbus_info[j].prefix;
+ host->testbus.select_major = j;
+ testbus_len = nminor * sizeof(u32);
+ for (i = 0; i < nminor; i++) {
+ host->testbus.select_minor = i;
+ ufs_qcom_testbus_config(host);
+ testbus[i] = ufshcd_readl(hba, UFS_TEST_BUS);
+ }
+ print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET,
+ 16, 4, testbus, testbus_len, false);
+ }
+}
+
static void ufs_qcom_dump_mcq_hci_regs(struct ufs_hba *hba)
{
/* sleep intermittently to prevent CPU hog during data dumps. */
@@ -1659,6 +1704,11 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba)
/* Dump MCQ Host Vendor Specific Registers */
if (hba->mcq_enabled)
ufs_qcom_dump_mcq_hci_regs(hba);
+
+ /* sleep a bit intermittently as we are dumping too much data */
+ ufshcd_dump_regs(hba, UFS_TEST_BUS, 4, "UFS_TEST_BUS ");
+ usleep_range(1000, 1100);
+ ufs_qcom_dump_testbus(hba);
}
}
--
2.17.1
