drm/i915/dmc: fix i915_reg_t usage

i915_reg_t is supposed to be a somewhat opaque data type, not to be
looked inside.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b813d0cf1b800386742eb3f919b0ba8d5c182a2a.1647870374.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
index 2e11725..5de13f9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -816,7 +816,7 @@ static int intel_dmc_debugfs_status_show(struct seq_file *m, void *unused)
        struct drm_i915_private *i915 = m->private;
        intel_wakeref_t wakeref;
        struct intel_dmc *dmc;
-       i915_reg_t dc5_reg, dc6_reg = {};
+       i915_reg_t dc5_reg, dc6_reg = INVALID_MMIO_REG;
 
        if (!HAS_DMC(i915))
                return -ENODEV;
@@ -868,7 +868,7 @@ static int intel_dmc_debugfs_status_show(struct seq_file *m, void *unused)
        }
 
        seq_printf(m, "DC3 -> DC5 count: %d\n", intel_de_read(i915, dc5_reg));
-       if (dc6_reg.reg)
+       if (i915_mmio_reg_valid(dc6_reg))
                seq_printf(m, "DC5 -> DC6 count: %d\n",
                           intel_de_read(i915, dc6_reg));