diff options
| author | Madhav Chauhan <madhav.chauhan@intel.com> | 2018-07-05 16:49:37 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2018-07-06 12:14:16 +0300 |
| commit | 45f09f7adc8a10138b158c5805a4d3b20aac611a (patch) | |
| tree | 5e1271bd2952a9b13c811f2a4271de5861e1b9d4 /drivers/gpu/drm/i915/icl_dsi.c | |
| parent | 166869b390b6fe763544fe4ae1e01acd28db331a (diff) | |
| download | linux-45f09f7adc8a10138b158c5805a4d3b20aac611a.tar.xz | |
drm/i915/icl: Power down unused DSI lanes
To save power, unused lanes should be powered
down using the bitfield of PORT_CL_DW10.
v2: Review comments from Jani N
- Put default label next to case 4
- Include the shifts in the macros
Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1530798591-2077-7-git-send-email-madhav.chauhan@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/icl_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/icl_dsi.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c index 774ab262c8f3..13830e43a4d1 100644 --- a/drivers/gpu/drm/i915/icl_dsi.c +++ b/drivers/gpu/drm/i915/icl_dsi.c @@ -74,6 +74,43 @@ static void gen11_dsi_enable_io_power(struct intel_encoder *encoder) } } +static void gen11_dsi_power_up_lanes(struct intel_encoder *encoder) +{ + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + enum port port; + u32 tmp; + u32 lane_mask; + + switch (intel_dsi->lane_count) { + case 1: + lane_mask = PWR_DOWN_LN_3_1_0; + break; + case 2: + lane_mask = PWR_DOWN_LN_3_1; + break; + case 3: + lane_mask = PWR_DOWN_LN_3; + break; + case 4: + default: + lane_mask = PWR_UP_ALL_LANES; + break; + } + + for_each_dsi_port(port, intel_dsi->ports) { + tmp = I915_READ(ICL_PORT_CL_DW10(port)); + tmp &= ~PWR_DOWN_LN_MASK; + I915_WRITE(ICL_PORT_CL_DW10(port), tmp | lane_mask); + } +} + +static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder) +{ + /* step 4a: power up all lanes of the DDI used by DSI */ + gen11_dsi_power_up_lanes(encoder); +} + static void __attribute__((unused)) gen11_dsi_pre_enable(struct intel_encoder *encoder, const struct intel_crtc_state *pipe_config, @@ -84,4 +121,7 @@ gen11_dsi_pre_enable(struct intel_encoder *encoder, /* step3: enable DSI PLL */ gen11_dsi_program_esc_clk_div(encoder); + + /* step4: enable DSI port and DPHY */ + gen11_dsi_enable_port_and_phy(encoder); } |