[PATCH 09/21] drm/radeon/kms: add workaround for dce3 ddc line vbios bug

[Alex Deucher]

commit 3074adc8b6d9bf28b574a58241b958057a69a7a0 upstream.

fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=23752

[AK: Dropped hunk for non existing i2c code in .35]
Signed-off-by: Alex Deucher <alexdeucher@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
[ backported -maks ]
Signed-off-by: maximilian attems <max@xxxxxxx>
Signed-off-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/radeon_atombios.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 7c9b013..cddf2c9 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -83,6 +83,14 @@ static inline struct radeon_i2c_bus_rec radeon_lookup_i2c_gpio(struct radeon_dev
 	for (i = 0; i < ATOM_MAX_SUPPORTED_DEVICE; i++) {
 		gpio = &i2c_info->asGPIO_Info[i];

+			/* 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;
--
1.7.0.4

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