On 2/23/2015 9:43 PM, Daniel Vetter wrote:
On Mon, Feb 16, 2015 at 01:21:34PM +0200, Ville Syrjälä wrote:
On Mon, Feb 16, 2015 at 03:07:59PM +0530, Vijay Purushothaman wrote:
As per the recommendation from PHY team, limit the max vco supported in CHV to 6.48 GHz
Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3b0fe9f..4e710f6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -390,7 +390,7 @@ static const intel_limit_t intel_limits_chv = {
* them would make no difference.
*/
.dot = { .min = 25000 * 5, .max = 540000 * 5},
- .vco = { .min = 4860000, .max = 6700000 },
+ .vco = { .min = 4860000, .max = 6480000 },
I have a patch here to reduce the minimum to 4.80 GHz, otherwise I can't
get my 2560x1440 HDMI display working (241.5 MHz clock). With that change
we still have a gap (233-240 MHz) in the frequencies we can produce.
Reducing the max to 6.48 GHz will increase that gap to 216-240 MHz, which
is a bit unfortunate. But if that's the recommendation we should follow
it I suppose, and hope no HDMI displays will want such frequencies.
Is there an updated spreadsheet available with the new limits? Quite a
few of the frequencies in the original spreadsheet did have vco>6.48
GHz.
Has the updated doc been dug up meanwhile? A big part of review is getting
access to docs and making sure they're up-to-date too ...
-Daniel
I sent the copy of excel sheet that i am using to both of you in another
mail. I still end up relying on windows driver folks since they seem to
be having latest information about PHY.
Thanks,
Vijay
I any case this seems OK, so
Acked-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
.n = { .min = 1, .max = 1 },
.m1 = { .min = 2, .max = 2 },
.m2 = { .min = 24 << 22, .max = 175 << 22 },
--
1.7.9.5
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--
Ville Syrjälä
Intel OTC
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