d1dd99083d
If phy is PHY_NONE, the shift to register bits becomes negative. Check and warn about this. Reported-by: coverity-bot <keescook@chromium.org> References: https://lore.kernel.org/r/202211180848.D39006C@keescook Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20221122120948.3436180-1-jani.nikula@intel.com
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2022 Intel Corporation
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*/
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#include "i915_drv.h"
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#include "intel_de.h"
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#include "intel_display.h"
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#include "intel_hti.h"
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#include "intel_hti_regs.h"
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void intel_hti_init(struct drm_i915_private *i915)
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{
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/*
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* If the platform has HTI, we need to find out whether it has reserved
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* any display resources before we create our display outputs.
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*/
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if (INTEL_INFO(i915)->display.has_hti)
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i915->display.hti.state = intel_de_read(i915, HDPORT_STATE);
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}
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bool intel_hti_uses_phy(struct drm_i915_private *i915, enum phy phy)
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{
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if (drm_WARN_ON(&i915->drm, phy == PHY_NONE))
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return false;
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return i915->display.hti.state & HDPORT_ENABLED &&
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i915->display.hti.state & HDPORT_DDI_USED(phy);
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}
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u32 intel_hti_dpll_mask(struct drm_i915_private *i915)
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{
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if (!(i915->display.hti.state & HDPORT_ENABLED))
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return 0;
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/*
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* Note: This is subtle. The values must coincide with what's defined
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* for the platform.
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*/
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return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, i915->display.hti.state);
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}
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