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drm/i915/icl: Program TA_TIMING_PARAM registers 

This patch programs D-PHY timing parameters for the
bus turn around flow(in escape clocks) only if dsi link
frequency <=800 MHz using DPHY_TA_TIMING_PARAM and its
identical register DSI_TA_TIMING_PARAM (inside DSI
Controller within the Display Core).

v2: Changes
    - Don't use KHz() macro (Ville/Jani N)
    - Use newly defined bitfields

v3 by Jani:
 - Use intel_dsi_bitrate() in favor of a new field
 - Remove redundant parens

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2c777092a748dfc973714399d8c19ed7a8c31a10.1539613303.git.jani.nikula@intel.com
This commit is contained in:
Madhav Chauhan 2018-10-15 17:27:55 +03:00 committed by Jani Nikula
parent e72cce5310
commit 5fea864558
1 changed files with 21 additions and 0 deletions
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21
drivers/gpu/drm/i915/icl_dsi.c
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@ -309,6 +309,27 @@ static void gen11_dsi_setup_dphy_timings(struct intel_encoder *encoder)
I915_WRITE(DSI_DATA_TIMING_PARAM(port),
intel_dsi->dphy_data_lane_reg);
}
/*
* If DSI link operating at or below an 800 MHz,
* TA_SURE should be override and programmed to
* a value '0' inside TA_PARAM_REGISTERS otherwise
* leave all fields at HW default values.
*/
if (intel_dsi_bitrate(intel_dsi) <= 800000) {
for_each_dsi_port(port, intel_dsi->ports) {
tmp = I915_READ(DPHY_TA_TIMING_PARAM(port));
tmp &= ~TA_SURE_MASK;
tmp |= TA_SURE_OVERRIDE | TA_SURE(0);
I915_WRITE(DPHY_TA_TIMING_PARAM(port), tmp);
/* shadow register inside display core */
tmp = I915_READ(DSI_TA_TIMING_PARAM(port));
tmp &= ~TA_SURE_MASK;
tmp |= TA_SURE_OVERRIDE | TA_SURE(0);
I915_WRITE(DSI_TA_TIMING_PARAM(port), tmp);
}
}
}
static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder)