i3c: dw: Add quirk to address OD/PP timing issue on AMD platform

The AMD Legacy I3C is having a problem with its IP, specifically with the
push-pull and open-drain pull-up registers. These registers need to be
manually programmed for every CCC submission to align with the duty cycle.
Therefore, add a quirk to address this issue.

Reviewed-by: Jarkko Nikula <[e-mail]>
Co-developed-by: Sanket Goswami <[e-mail]>
Signed-off-by: Sanket Goswami <[e-mail]>
Signed-off-by: Shyam Sundar S K <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/i3c/master/dw-i3c-master.c

···
 
 #define XFER_TIMEOUT (msecs_to_jiffies(1000))
 #define RPM_AUTOSUSPEND_TIMEOUT 1000 /* ms */
+
+/* Timing values to configure 12.5MHz frequency */
+#define AMD_I3C_OD_TIMING          0x4C007C
+#define AMD_I3C_PP_TIMING          0x8001A
+
+/* List of quirks */
+#define AMD_I3C_OD_PP_TIMING		BIT(1)
+
 struct dw_i3c_cmd {
 	u32 cmd_lo;
 	u32 cmd_hi;
···
 	return ret;
 }
 
+static void amd_configure_od_pp_quirk(struct dw_i3c_master *master)
+{
+	master->i3c_od_timing = AMD_I3C_OD_TIMING;
+	master->i3c_pp_timing = AMD_I3C_PP_TIMING;
+}
+
 static int dw_i3c_master_send_ccc_cmd(struct i3c_master_controller *m,
 				      struct i3c_ccc_cmd *ccc)
 {
···
 
 	if (ccc->id == I3C_CCC_ENTDAA)
 		return -EINVAL;
+
+	/* AMD platform specific OD and PP timings */
+	if (master->quirks & AMD_I3C_OD_PP_TIMING) {
+		amd_configure_od_pp_quirk(master);
+		writel(master->i3c_pp_timing, master->regs + SCL_I3C_PP_TIMING);
+		writel(master->i3c_od_timing, master->regs + SCL_I3C_OD_TIMING);
+	}
 
 	ret = pm_runtime_resume_and_get(master->dev);
 	if (ret < 0) {
···
 	master->maxdevs = ret >> 16;
 	master->free_pos = GENMASK(master->maxdevs - 1, 0);
 
+	master->quirks = (unsigned long)device_get_match_data(&pdev->dev);
+
 	INIT_WORK(&master->hj_work, dw_i3c_hj_work);
 	ret = i3c_master_register(&master->base, &pdev->dev,
 				  &dw_mipi_i3c_ops, false);
···
 
 static void dw_i3c_master_restore_timing_regs(struct dw_i3c_master *master)
 {
+	/* AMD platform specific OD and PP timings */
+	if (master->quirks & AMD_I3C_OD_PP_TIMING)
+		amd_configure_od_pp_quirk(master);
+
 	writel(master->i3c_pp_timing, master->regs + SCL_I3C_PP_TIMING);
 	writel(master->bus_free_timing, master->regs + BUS_FREE_TIMING);
 	writel(master->i3c_od_timing, master->regs + SCL_I3C_OD_TIMING);
···
 MODULE_DEVICE_TABLE(of, dw_i3c_master_of_match);
 
 static const struct acpi_device_id amd_i3c_device_match[] = {
-	{ "AMDI0015" },
+	{ "AMDI0015", AMD_I3C_OD_PP_TIMING },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, amd_i3c_device_match);

drivers/i3c/master/dw-i3c-master.h

···
 	u32 bus_free_timing;
 	u32 i2c_fm_timing;
 	u32 i2c_fmp_timing;
+	u32 quirks;
 	/*
 	 * Per-device hardware data, used to manage the device address table
 	 * (DAT)