@@ -139,6 +139,21 @@ static void cdnsp_clear_port_change_bit(struct cdnsp_device *pdev,
(portsc & PORT_CHANGE_BITS), port_regs);
}
+static void cdnsp_set_apb_timeout_value(struct cdnsp_device *pdev)
+{
+ __le32 __iomem *reg;
+ void __iomem *base;
+ u32 offset = 0;
+ u32 val;
+
+ base = &pdev->cap_regs->hc_capbase;
+ offset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);
+ reg = base + offset + REG_CHICKEN_BITS_3_OFFSET;
+
+ val = le32_to_cpu(readl(reg));
+ writel(cpu_to_le32(CHICKEN_APB_TIMEOUT_SET(val)), reg);
+}
+
static void cdnsp_set_chicken_bits_2(struct cdnsp_device *pdev, u32 bit)
{
__le32 __iomem *reg;
@@ -1798,6 +1813,13 @@ static int cdnsp_gen_setup(struct cdnsp_device *pdev)
pdev->hci_version = HC_VERSION(pdev->hcc_params);
pdev->hcc_params = readl(&pdev->cap_regs->hcc_params);
+ /* In very rare cases after resuming controller from L1 to L0 it reads
+ * registers before the clock has been enabled and as the result driver
+ * reads incorrect value.
+ * To fix this issue driver increases APB timeout value.
+ */
+ cdnsp_set_apb_timeout_value(pdev);
+
cdnsp_get_rev_cap(pdev);
/* Make sure the Device Controller is halted. */
@@ -520,6 +520,10 @@ struct cdnsp_rev_cap {
#define REG_CHICKEN_BITS_2_OFFSET 0x48
#define CHICKEN_XDMA_2_TP_CACHE_DIS BIT(28)
+#define REG_CHICKEN_BITS_3_OFFSET 0x4C
+#define CHICKEN_APB_TIMEOUT_VALUE 0x1C20
+#define CHICKEN_APB_TIMEOUT_SET(p) (((p) & ~GENMASK(21, 0)) | CHICKEN_APB_TIMEOUT_VALUE)
+
/* XBUF Extended Capability ID. */
#define XBUF_CAP_ID 0xCB
#define XBUF_RX_TAG_MASK_0_OFFSET 0x1C
Subject: [PATCH] usb: cdnsp: Fix issue with resuming from L1 In very rare cases after resuming controller from L1 to L0 it reads registers before the clock has been enabled and as the result driver reads incorrect value. To fix this issue driver increases APB timeout value. Probably this issue occurs only on Cadence platform but fix should have no impact for other existing platforms. Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver") cc: stable@vger.kernel.org Signed-off-by: Pawel Laszczak <pawell@cadence.com> --- drivers/usb/cdns3/cdnsp-gadget.c | 22 ++++++++++++++++++++++ drivers/usb/cdns3/cdnsp-gadget.h | 4 ++++ 2 files changed, 26 insertions(+)