diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_dp.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/atombios_dp.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 5bf825dfaa09..3e3290c203c6 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -158,7 +158,7 @@ done: #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) static ssize_t -radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) +radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { struct radeon_i2c_chan *chan = container_of(aux, struct radeon_i2c_chan, aux); @@ -178,6 +178,13 @@ radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) switch (msg->request & ~DP_AUX_I2C_MOT) { case DP_AUX_NATIVE_WRITE: case DP_AUX_I2C_WRITE: + /* The atom implementation only supports writes with a max payload of + * 12 bytes since it uses 4 bits for the total count (header + payload) + * in the parameter space. The atom interface supports 16 byte + * payloads for reads. The hw itself supports up to 16 bytes of payload. + */ + if (WARN_ON_ONCE(msg->size > 12)) + return -E2BIG; /* tx_size needs to be 4 even for bare address packets since the atom * table needs the info in tx_buf[3]. */ @@ -219,11 +226,20 @@ radeon_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) void radeon_dp_aux_init(struct radeon_connector *radeon_connector) { + struct drm_device *dev = radeon_connector->base.dev; + struct radeon_device *rdev = dev->dev_private; int ret; radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd; radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev; - radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer; + if (ASIC_IS_DCE5(rdev)) { + if (radeon_auxch) + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native; + else + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; + } else { + radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; + } ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux); if (!ret) @@ -294,8 +310,8 @@ static int dp_get_max_dp_pix_clock(int link_rate, /***** radeon specific DP functions *****/ -static int radeon_dp_get_max_link_rate(struct drm_connector *connector, - u8 dpcd[DP_DPCD_SIZE]) +int radeon_dp_get_max_link_rate(struct drm_connector *connector, + u8 dpcd[DP_DPCD_SIZE]) { int max_link_rate; |