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* document GPIO values better based on AMD docs 

* no functional change


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42730 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Alexander von Gluck IV 2011-09-09 18:45:38 +00:00
parent c3ec7fedec
commit f3ccbf7121
1 changed files with 15 additions and 8 deletions
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23
src/add-ons/accelerants/radeon_hd/gpu.cpp
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@ -387,6 +387,8 @@ radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id)
gConnector[connector]->connector_ddc_info.valid = true;
gConnector[connector]->connector_ddc_info.gpio_id = gpio_id;
// GPIO mask (Allows software to control the GPIO pad)
// 0 = chip access; 1 = only software;
gConnector[connector]->connector_ddc_info.mask_scl_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usClkMaskRegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.mask_sda_reg
@ -396,6 +398,8 @@ radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id)
gConnector[connector]->connector_ddc_info.mask_sda_shift
= (1 << gpio->ucDataMaskShift);
// GPIO output / write (A) enable
// 0 = GPIO input (Y); 1 = GPIO output (A);
gConnector[connector]->connector_ddc_info.gpio_en_scl_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usClkEnRegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_en_sda_reg
@ -405,6 +409,17 @@ radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id)
gConnector[connector]->connector_ddc_info.gpio_en_sda_shift
= (1 << gpio->ucDataEnShift);
// GPIO output / write (A)
gConnector[connector]->connector_ddc_info.gpio_a_scl_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usClkA_RegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_a_sda_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usDataA_RegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_a_scl_shift
= (1 << gpio->ucClkA_Shift);
gConnector[connector]->connector_ddc_info.gpio_a_sda_shift
= (1 << gpio->ucDataA_Shift);
// GPIO input / read (Y)
gConnector[connector]->connector_ddc_info.gpio_y_scl_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usClkY_RegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_y_sda_reg
@ -414,14 +429,6 @@ radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id)
gConnector[connector]->connector_ddc_info.gpio_y_sda_shift
= (1 << gpio->ucDataY_Shift);
gConnector[connector]->connector_ddc_info.gpio_a_scl_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usClkA_RegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_a_sda_reg
= B_LENDIAN_TO_HOST_INT16(gpio->usDataA_RegisterIndex) * 4;
gConnector[connector]->connector_ddc_info.gpio_a_scl_shift
= (1 << gpio->ucClkA_Shift);
gConnector[connector]->connector_ddc_info.gpio_a_sda_shift
= (1 << gpio->ucDataA_Shift);
}
return B_OK;