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Commit 3074adc8 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: add workaround for dce3 ddc line vbios bug 

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



Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Cc:stable@kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent c49948f4

drivers/gpu/drm/radeon/radeon_atombios.c

+16 −0
Original line number Diff line number Diff line
@@ -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;