On the Lenovo Yoga Tab 3 Pro YT3-X90F there are 2 issues with the backlight
on/off MIPI sequences:
1. The backlight on sequence has an I2C MIPI sequence element which uses
bus 0, but there is a bogus I2cSerialBus resource under the GPU in
the DSDT which causes i2c_acpi_find_adapter() to pick the wrong bus.
2. There is no backlight off sequence, causing the backlight to stay on.
Add a DMI quirk fixing both issues.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/gpu/drm/i915/display/vlv_dsi.c | 32 ++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
index e247e3413d90..db519cfc243b 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -1801,6 +1801,29 @@ static void vlv_dsi_lenovo_yoga_tab2_size_fixup(struct intel_dsi *intel_dsi)
}
}
+/*
+ * On the Lenovo Yoga Tab 3 Pro YT3-X90F there are 2 problems:
+ * 1. i2c_acpi_find_adapter() picks the wrong adapter causing mipi_exec_i2c()
+ * to not work. Fix this by setting i2c_bus_num.
+ * 2. There is no backlight off MIPI sequence, causing the backlight to stay on.
+ * Add a backlight off sequence mirroring the existing backlight on sequence.
+ */
+static void vlv_dsi_lenovo_yoga_tab3_backlight_fixup(struct intel_dsi *intel_dsi)
+{
+ static const u8 backlight_off_sequence[16] = {
+ /* Header Seq-id 7, length after header 11 bytes */
+ 0x07, 0x0b, 0x00, 0x00, 0x00,
+ /* MIPI_SEQ_ELEM_I2C bus 0 addr 0x2c reg 0x00 data-len 1 data 0x00 */
+ 0x04, 0x08, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x01, 0x00,
+ /* MIPI_SEQ_ELEM_END */
+ 0x00
+ };
+ struct intel_connector *connector = intel_dsi->attached_connector;
+
+ intel_dsi->i2c_bus_num = 0;
+ connector->panel.vbt.dsi.sequence[MIPI_SEQ_BACKLIGHT_OFF] = backlight_off_sequence;
+}
+
static const struct dmi_system_id vlv_dsi_dmi_quirk_table[] = {
{
/* Asus Transformer Pad TF103C */
@@ -1824,6 +1847,15 @@ static const struct dmi_system_id vlv_dsi_dmi_quirk_table[] = {
},
.driver_data = (void *)vlv_dsi_lenovo_yoga_tab2_size_fixup,
},
+ {
+ /* Lenovo Yoga Tab 3 Pro YT3-X90F */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
+ },
+ .driver_data = (void *)vlv_dsi_lenovo_yoga_tab3_backlight_fixup,
+ },
{ }
};
--
2.41.0
