drm/i915: Don't trust CSR program memory contents
Replaces "drm/i915: Force loading of csr program at boot" in the old
series.
Previously we called blindly into intel_csr_load_program() and depended
on a check of whether the CSR program memory was cleared or not.
This check is not reliable and no longer needed since we fixed the
call-sites of intel_csr_load_program().
Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447084107-8521-2-git-send-email-patrik.jakobsson@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 2d6527e..d16f77f 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -216,14 +216,10 @@
return;
}
- /*
- * FIXME: Firmware gets lost on S3/S4, but not when entering system
- * standby or suspend-to-idle (which is just like forced runtime pm).
- * Unfortunately the ACPI subsystem doesn't yet give us a way to
- * differentiate this, hence figure it out with this hack.
- */
- if ((!dev_priv->csr.dmc_payload) || I915_READ(CSR_PROGRAM(0)))
+ if (!dev_priv->csr.dmc_payload) {
+ DRM_ERROR("Tried to program CSR with empty payload\n");
return;
+ }
fw_size = dev_priv->csr.dmc_fw_size;
for (i = 0; i < fw_size; i++)