[PATCH i-g-t v10 26/49] lib/unigraf: Add unigraf assert and deassert helpers

[Louis Chauvet <louis.chauvet@bootlin.com>]

Unigraf is able to manipulate the HPD line of the connector, add few
helpers to manipulate them.

Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 lib/vendor/unigraf/unigraf.c | 53 ++++++++++++++++++++++++++++++++++++++++++++
 lib/vendor/unigraf/unigraf.h |  6 +++++
 2 files changed, 59 insertions(+)

diff --git a/lib/vendor/unigraf/unigraf.c b/lib/vendor/unigraf/unigraf.c
index e6760ba84386..aca26fe06cc5 100644
--- a/lib/vendor/unigraf/unigraf.c
+++ b/lib/vendor/unigraf/unigraf.c
@@ -93,6 +93,22 @@ static void unigraf_init(void)
 	igt_install_exit_handler(unigraf_exit_handler);
 }
 
+/**
+ * unigraf_write_u32 - Write a 32-bit value to a TSI configuration item
+ * @config_id: The configuration item ID to write to
+ * @value: The 32-bit value to write
+ *
+ * This macro writes a 32-bit value to the specified TSI configuration item.
+ * This is a macro to have the proper line information when using unigraf_debug.
+ */
+#define unigraf_write_u32(config_id, value)									\
+	({													\
+		uint32_t v = (value);										\
+		igt_assert(unigraf_device);									\
+		unigraf_debug("Value write: " #config_id "=%d...\n", v);					\
+		unigraf_assert(TSIX_TS_SetConfigItem(unigraf_device, config_id, &v, sizeof(value)));		\
+	})
+
 /**
  * unigraf_device_count() - Return the number of scanned devices
  *
@@ -293,3 +309,40 @@ void unigraf_require_device(int drm_fd)
  */
 void unigraf_reset(void)
 {}
+
+/**
+ * unigraf_hpd_assert() - Assert Hot Plug Detect signal
+ *
+ * This function asserts the HPD signal, simulating a device connection.
+ */
+void unigraf_hpd_assert(void)
+{
+	unigraf_write_u32(TSI_FORCE_HOT_PLUG_STATE_W, 1);
+}
+
+/**
+ * unigraf_hpd_pulse() - Pulse the Hot Plug Detect signal
+ * @duration: The duration in milliseconds for which the HPD signal should be pulsed
+ *
+ * This function pulses the HPD signal for the specified duration.
+ */
+void unigraf_hpd_pulse(int duration)
+{
+	/* In theory this should work:
+	 * unigraf_write_u32(TSI_DPRX_HPD_PULSE_W, duration);
+	 * But this seems to be broken and this works:
+	 */
+	unigraf_hpd_deassert();
+	usleep(duration);
+	unigraf_hpd_assert();
+}
+
+/**
+ * unigraf_hpd_deassert() - Deassert Hot Plug Detect signal
+ *
+ * This function deasserts the HPD signal, simulating a device disconnection.
+ */
+void unigraf_hpd_deassert(void)
+{
+	unigraf_write_u32(TSI_FORCE_HOT_PLUG_STATE_W, 0);
+}
diff --git a/lib/vendor/unigraf/unigraf.h b/lib/vendor/unigraf/unigraf.h
index 4c2cbd6b1aa5..77fba4e53912 100644
--- a/lib/vendor/unigraf/unigraf.h
+++ b/lib/vendor/unigraf/unigraf.h
@@ -42,4 +42,10 @@ void unigraf_require_device(int drm_fd);
 
 void unigraf_reset(void);
 
+void unigraf_hpd_deassert(void);
+
+void unigraf_hpd_pulse(int duration);
+
+void unigraf_hpd_assert(void);
+
 #endif // UNIGRAF_H

-- 
2.52.0