i3c: mipi-i3c-hci: Add DMA ring abort quirk for Intel controllers

DMA rings can be aborted either per-ring via RING_CONTROL or globally
via HC_CONTROL_ABORT. The driver currently relies on the per-ring
mechanism.

Some Intel I3C HCI controllers require HC_CONTROL_ABORT to be asserted
before a DMA ring abort is effective.  This behavior is non-standard.
Introduce a controller quirk to select the required abort method and
enable it for Intel LPSS I3C controllers.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260603090754.16252-12-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
index 770235ad6b2597715386bf38130ef9dafecd01f5..8274c84b16be8b466db635386291f447ff09af17 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/core.c
+++ b/drivers/i3c/master/mipi-i3c-hci/core.c
@@ -231,7 +231,20 @@ static void i3c_hci_bus_cleanup(struct i3c_master_controller *m)
 
 void mipi_i3c_hci_resume(struct i3c_hci *hci)
 {
-       reg_set(HC_CONTROL, HC_CONTROL_RESUME);
+       u32 reg = reg_read(HC_CONTROL);
+
+       reg |= HC_CONTROL_RESUME;
+       reg &= ~HC_CONTROL_ABORT;
+       reg_write(HC_CONTROL, reg);
+}
+
+void mipi_i3c_hci_abort(struct i3c_hci *hci)
+{
+       u32 reg = reg_read(HC_CONTROL);
+
+       reg &= ~HC_CONTROL_RESUME; /* Do not set resume */
+       reg |= HC_CONTROL_ABORT;
+       reg_write(HC_CONTROL, reg);
 }
 
 /* located here rather than pio.c because needed bits are in core reg space */
@@ -1053,7 +1066,8 @@ static const struct platform_device_id i3c_hci_driver_ids[] = {
        { .name = "intel-lpss-i3c", HCI_QUIRK_RPM_ALLOWED |
                                    HCI_QUIRK_RPM_IBI_ALLOWED |
                                    HCI_QUIRK_RPM_PARENT_MANAGED |
-                                   HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET },
+                                   HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET |
+                                   HCI_QUIRK_DMA_REQUIRES_HC_ABORT },
        { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(platform, i3c_hci_driver_ids);

diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
index f2d33068b8dfdfa1b4338871cd02e06ae7507298..f9023cb3c5a2c859ac197d043946ec262338d035 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/dma.c
+++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
@@ -597,8 +597,21 @@ static void hci_dma_xfer_done(struct i3c_hci *hci, struct hci_rh_data *rh)
        rh_reg_write(RING_OPERATION1, op1_val);
 }
 
-static void hci_dma_abort(struct hci_rh_data *rh)
+static void hci_dma_requires_hc_abort_quirk(struct i3c_hci *hci, struct hci_rh_data *rh)
 {
+       reinit_completion(&rh->op_done);
+       mipi_i3c_hci_abort(hci);
+       wait_for_completion_timeout(&rh->op_done, HZ);
+       rh_reg_write(RING_CONTROL, rh_reg_read(RING_CONTROL) | RING_CTRL_ABORT);
+}
+
+static void hci_dma_abort(struct i3c_hci *hci, struct hci_rh_data *rh)
+{
+       if (hci->quirks & HCI_QUIRK_DMA_REQUIRES_HC_ABORT) {
+               hci_dma_requires_hc_abort_quirk(hci, rh);
+               return;
+       }
+
        reinit_completion(&rh->op_done);
        rh_reg_write(RING_CONTROL, rh_reg_read(RING_CONTROL) | RING_CTRL_ABORT);
        wait_for_completion_timeout(&rh->op_done, HZ);
@@ -630,7 +643,7 @@ static bool hci_dma_dequeue_xfer(struct i3c_hci *hci,
                hci->enqueue_blocked = true;
                spin_unlock_irq(&hci->lock);
                /* stop the ring */
-               hci_dma_abort(rh);
+               hci_dma_abort(hci, rh);
                spin_lock_irq(&hci->lock);
                ring_status = rh_reg_read(RING_STATUS);
                if (ring_status & RING_STATUS_RUNNING) {

diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h
index 01237b12d32e8908041a99cab07d470bf423949e..97c31a315a6e305fd1cc4009f9d821d608d4780a 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/hci.h
+++ b/drivers/i3c/master/mipi-i3c-hci/hci.h
@@ -157,9 +157,11 @@ struct i3c_hci_dev_data {
 #define HCI_QUIRK_RPM_IBI_ALLOWED      BIT(6)  /* IBI and Hot-Join allowed while runtime suspended */
 #define HCI_QUIRK_RPM_PARENT_MANAGED   BIT(7)  /* Runtime PM managed by parent device */
 #define HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET BIT(8)  /* Do PIO queue SW resets after DMA abort */
+#define HCI_QUIRK_DMA_REQUIRES_HC_ABORT                BIT(9)  /* Use HC_CONTROL ABORT to abort DMA */
 
 /* global functions */
 void mipi_i3c_hci_resume(struct i3c_hci *hci);
+void mipi_i3c_hci_abort(struct i3c_hci *hci);
 void mipi_i3c_hci_pio_reset(struct i3c_hci *hci);
 void mipi_i3c_hci_pio_reset_all_queues(struct i3c_hci *hci);
 void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci);