Commit 31643d54 authored by Ben Widawsky's avatar Ben Widawsky Committed by Daniel Vetter

drm/i915: Workaround to bump rc6 voltage to 450

BIOS should be setting the minimum voltage for rc6 to be 450mV. Old or
buggy BIOSen may not be doing this, so we correct it for them. Ideally
customers should update the BIOS as only it would know the optimal
values for the platform, so we leave that fact as a DRM_ERROR for the
user to see.

Unfortunately this isn't fixing any of the issues it was targeted to
fix, but it is documented that we must do it.

CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Matt Turner <mattst88@gmail.com>
Signed-off-by: default avatarBen Widawsky <ben@bwidawsk.net>
Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
[danvet: bikeshedded loglevel of the "your bios is broken message" to
debug.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 42c0526c
......@@ -4225,6 +4225,10 @@
#define GEN6_READ_OC_PARAMS 0xc
#define GEN6_PCODE_WRITE_MIN_FREQ_TABLE 0x8
#define GEN6_PCODE_READ_MIN_FREQ_TABLE 0x9
#define GEN6_PCODE_WRITE_RC6VIDS 0x4
#define GEN6_PCODE_READ_RC6VIDS 0x5
#define GEN6_ENCODE_RC6_VID(mv) (((mv) / 5) - 245) < 0 ?: 0
#define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) > 0 ? ((vids) * 5) + 245 : 0)
#define GEN6_PCODE_DATA 0x138128
#define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
......
......@@ -2404,7 +2404,7 @@ static void gen6_enable_rps(struct drm_device *dev)
struct intel_ring_buffer *ring;
u32 rp_state_cap;
u32 gt_perf_status;
u32 pcu_mbox, rc6_mask = 0;
u32 rc6vids, pcu_mbox, rc6_mask = 0;
u32 gtfifodbg;
int rc6_mode;
int i, ret;
......@@ -2526,6 +2526,20 @@ static void gen6_enable_rps(struct drm_device *dev)
/* enable all PM interrupts */
I915_WRITE(GEN6_PMINTRMSK, 0);
rc6vids = 0;
ret = sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids);
if (IS_GEN6(dev) && ret) {
DRM_DEBUG_DRIVER("Couldn't check for BIOS workaround\n");
} else if (IS_GEN6(dev) && (GEN6_DECODE_RC6_VID(rc6vids & 0xff) < 450)) {
DRM_DEBUG_DRIVER("You should update your BIOS. Correcting minimum rc6 voltage (%dmV->%dmV)\n",
GEN6_DECODE_RC6_VID(rc6vids & 0xff), 450);
rc6vids &= 0xffff00;
rc6vids |= GEN6_ENCODE_RC6_VID(450);
ret = sandybridge_pcode_write(dev_priv, GEN6_PCODE_WRITE_RC6VIDS, rc6vids);
if (ret)
DRM_ERROR("Couldn't fix incorrect rc6 voltage\n");
}
gen6_gt_force_wake_put(dev_priv);
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment