drm/radeon/kms: add workaround for dce3 ddc line vbios bug
fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=23752
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc:stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 87ead09..bc5a2c3 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -98,6 +98,14 @@
}
}
+ /* some DCE3 boards have bad data for this entry */
+ if (ASIC_IS_DCE3(rdev)) {
+ if ((i == 4) &&
+ (gpio->usClkMaskRegisterIndex == 0x1fda) &&
+ (gpio->sucI2cId.ucAccess == 0x94))
+ gpio->sucI2cId.ucAccess = 0x14;
+ }
+
if (gpio->sucI2cId.ucAccess == id) {
i2c.mask_clk_reg = le16_to_cpu(gpio->usClkMaskRegisterIndex) * 4;
i2c.mask_data_reg = le16_to_cpu(gpio->usDataMaskRegisterIndex) * 4;
@@ -174,6 +182,14 @@
}
}
+ /* some DCE3 boards have bad data for this entry */
+ if (ASIC_IS_DCE3(rdev)) {
+ if ((i == 4) &&
+ (gpio->usClkMaskRegisterIndex == 0x1fda) &&
+ (gpio->sucI2cId.ucAccess == 0x94))
+ gpio->sucI2cId.ucAccess = 0x14;
+ }
+
i2c.mask_clk_reg = le16_to_cpu(gpio->usClkMaskRegisterIndex) * 4;
i2c.mask_data_reg = le16_to_cpu(gpio->usDataMaskRegisterIndex) * 4;
i2c.en_clk_reg = le16_to_cpu(gpio->usClkEnRegisterIndex) * 4;