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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>
This commit is contained in:
Alex Deucher 2010-11-30 00:15:10 -05:00 committed by Dave Airlie
parent c49948f4bd
commit 3074adc8b6
1 changed files with 16 additions and 0 deletions
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16
drivers/gpu/drm/radeon/radeon_atombios.c
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@ -98,6 +98,14 @@ static inline struct radeon_i2c_bus_rec radeon_lookup_i2c_gpio(struct radeon_dev
}
}
/* 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 @@ void radeon_atombios_i2c_init(struct radeon_device *rdev)
}
}
/* 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;