The AMD HCI controller currently only supports PIO mode but exposes DMA
rings to the OS, which leads to the controller being configured in DMA
mode. To address this, add a quirk to avoid configuring the controller in
DMA mode and default to PIO mode.

Additionally, introduce a generic quirk infrastructure to the mipi-i3c-hci
driver to facilitate seamless future quirk additions.

Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Co-developed-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Co-developed-by: Guruvendra Punugupati <Guruvendra.Punugupati@amd.com>
Signed-off-by: Guruvendra Punugupati <Guruvendra.Punugupati@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/i3c/master/mipi-i3c-hci/core.c | 8 +++++++-
 drivers/i3c/master/mipi-i3c-hci/hci.h  | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
index a6781cfeebb8..23abf91b277b 100644
--- a/drivers/i3c/master/mipi-i3c-hci/core.c
+++ b/drivers/i3c/master/mipi-i3c-hci/core.c
@@ -756,6 +756,10 @@ static int i3c_hci_init(struct i3c_hci *hci)
 	mode_selector = hci->version_major > 1 ||
 				(hci->version_major == 1 && hci->version_minor > 0);
 
+	/* Quirk for HCI_QUIRK_PIO_MODE on AMD platforms */
+	if (hci->quirks & HCI_QUIRK_PIO_MODE)
+		hci->RHS_regs = NULL;
+
 	/* Try activating DMA operations first */
 	if (hci->RHS_regs) {
 		reg_clear(HC_CONTROL, HC_CONTROL_PIO_MODE);
@@ -806,6 +810,8 @@ static int i3c_hci_probe(struct platform_device *pdev)
 	/* temporary for dev_printk's, to be replaced in i3c_master_register */
 	hci->master.dev.init_name = dev_name(&pdev->dev);
 
+	hci->quirks = (unsigned long)device_get_match_data(&pdev->dev);
+
 	ret = i3c_hci_init(hci);
 	if (ret)
 		return ret;
@@ -838,7 +844,7 @@ static const __maybe_unused struct of_device_id i3c_hci_of_match[] = {
 MODULE_DEVICE_TABLE(of, i3c_hci_of_match);
 
 static const struct acpi_device_id i3c_hci_acpi_match[] = {
-	{ "AMDI5017" },
+	{ "AMDI5017", HCI_QUIRK_PIO_MODE },
 	{}
 };
 MODULE_DEVICE_TABLE(acpi, i3c_hci_acpi_match);
diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h
index f94d95e024be..c56b838fb431 100644
--- a/drivers/i3c/master/mipi-i3c-hci/hci.h
+++ b/drivers/i3c/master/mipi-i3c-hci/hci.h
@@ -135,6 +135,7 @@ struct i3c_hci_dev_data {
 
 /* list of quirks */
 #define HCI_QUIRK_RAW_CCC	BIT(1)	/* CCC framing must be explicit */
+#define HCI_QUIRK_PIO_MODE	BIT(2)  /* Set PIO mode for AMD platforms */
 
 
 /* global functions */
-- 
2.25.1