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drm/i915/icl: Enable DDI Buffer

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This patch enables DDI buffer by writing to DDI_BUF_CTL
register and wait for DDI status to be *not idle* for a
port.

v2: Rebase
v3: Remove step hard coding comments (Jani N)

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/1537095223-5184-4-git-send-email-madhav.chauhan@intel.com
This commit is contained in:
Madhav Chauhan 2018-09-16 16:23:26 +05:30 committed by Jani Nikula
parent 3f4b9d9d02
commit ba3df888be
1 changed files with 22 additions and 0 deletions
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22
drivers/gpu/drm/i915/icl_dsi.c
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@ -258,6 +258,25 @@ static void gen11_dsi_voltage_swing_program_seq(struct intel_encoder *encoder)
}
}
static void gen11_dsi_enable_ddi_buffer(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);
u32 tmp;
enum port port;
for_each_dsi_port(port, intel_dsi->ports) {
tmp = I915_READ(DDI_BUF_CTL(port));
tmp |= DDI_BUF_CTL_ENABLE;
I915_WRITE(DDI_BUF_CTL(port), tmp);
if (wait_for_us(!(I915_READ(DDI_BUF_CTL(port)) &
DDI_BUF_IS_IDLE),
500))
DRM_ERROR("DDI port:%c buffer idle\n", port_name(port));
}
}
static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder)
{
/* step 4a: power up all lanes of the DDI used by DSI */
@ -268,6 +287,9 @@ static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder)
/* step 4c: configure voltage swing and skew */
gen11_dsi_voltage_swing_program_seq(encoder);
/* enable DDI buffer */
gen11_dsi_enable_ddi_buffer(encoder);
}
static void __attribute__((unused))