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    Subject[PATCH] [131/223] drm/radeon/kms: add workaround for dce3 ddc line vbios bug
    Date
    2.6.35-longterm review patch.  If anyone has any objections, please let me know.

    ------------------
    From: Alex Deucher <alexdeucher@gmail.com>

    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@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    drivers/gpu/drm/radeon/radeon_atombios.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    Index: linux/drivers/gpu/drm/radeon/radeon_atombios.c
    ===================================================================
    --- linux.orig/drivers/gpu/drm/radeon/radeon_atombios.c
    +++ linux/drivers/gpu/drm/radeon/radeon_atombios.c
    @@ -84,6 +84,14 @@ static inline struct radeon_i2c_bus_rec
    for (i = 0; i < num_indices; 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;

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