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* perform some i2c cleanup from xorg ati driver

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* read gpio pins back after setting them to improve reliability


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42772 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Alexander von Gluck IV 2011-09-27 20:08:46 +00:00
parent 2815c2d2c6
commit 4a0f028c4d
1 changed files with 20 additions and 19 deletions
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39
src/add-ons/accelerants/radeon_hd/gpu.cpp
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@ -285,20 +285,22 @@ lock_i2c(void* cookie, bool lock)
uint32 buffer = 0;
// hw_capable and > DCE3
if (info->hw_capable == true
&& sinfo.device_chipset >= (RADEON_R600 | 0x20)) {
// Switch GPIO pads to ddc mode
buffer = Read32(OUT, info->mask_scl_reg);
buffer &= ~(1 << 16);
Write32(OUT, info->mask_scl_reg, buffer);
}
if (lock == true) {
// hw_capable and > DCE3
if (info->hw_capable == true
&& sinfo.device_chipset >= (RADEON_R600 | 0x20)) {
// Switch GPIO pads to ddc mode
buffer = Read32(OUT, info->mask_scl_reg);
buffer &= ~(1 << 16);
Write32(OUT, info->mask_scl_reg, buffer);
}
// Clear pins
buffer = Read32(OUT, info->a_scl_reg) & ~info->a_scl_mask;
Write32(OUT, info->a_scl_reg, buffer);
buffer = Read32(OUT, info->a_sda_reg) & ~info->a_sda_mask;
Write32(OUT, info->a_sda_reg, buffer);
// Clear pins
buffer = Read32(OUT, info->a_scl_reg) & ~info->a_scl_mask;
Write32(OUT, info->a_scl_reg, buffer);
buffer = Read32(OUT, info->a_sda_reg) & ~info->a_sda_mask;
Write32(OUT, info->a_sda_reg, buffer);
}
// Set pins to input
buffer = Read32(OUT, info->en_scl_reg) & ~info->en_scl_mask;
@ -313,7 +315,6 @@ lock_i2c(void* cookie, bool lock)
} else {
buffer &= ~info->mask_scl_mask;
}
Write32(OUT, info->mask_scl_reg, buffer);
Read32(OUT, info->mask_scl_reg);
@ -323,7 +324,6 @@ lock_i2c(void* cookie, bool lock)
} else {
buffer &= ~info->mask_sda_mask;
}
Write32(OUT, info->mask_sda_reg, buffer);
Read32(OUT, info->mask_sda_reg);
}
@ -353,14 +353,15 @@ set_i2c_signals(void* cookie, int clock, int data)
uint32 scl = Read32(OUT, info->en_scl_reg)
& ~info->en_scl_mask;
scl |= clock ? 0 : info->en_scl_mask;
Write32(OUT, info->en_scl_reg, scl);
Read32(OUT, info->en_scl_reg);
uint32 sda = Read32(OUT, info->en_sda_reg)
& ~info->en_sda_mask;
scl |= clock ? 0 : info->en_scl_mask;
sda |= data ? 0 : info->en_sda_mask;
Write32(OUT, info->en_scl_reg, scl);
Write32(OUT, info->en_sda_reg, sda);
Read32(OUT, info->en_sda_reg);
return B_OK;
}