Attachment 130979 Details for Bug 100755 – test_revert

[patch] test_revert

0001-Revert-drm-i915-dp-reduce-link-M-N-parameters.patch (text/plain), 1.36 KB, created by Dhinakaran Pandiyan on 2017-04-22 07:15:11 UTC

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Creator: Dhinakaran Pandiyan

Created: 2017-04-22 07:15:11 UTC

Size: 1.36 KB

patch

obsolete

>From 8cd36c63ba72824e92b0d8339df887f59a70d972 Mon Sep 17 00:00:00 2001
>From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
>Date: Fri, 21 Apr 2017 23:58:09 -0700
>Subject: [PATCH] Revert "drm/i915/dp: reduce link M/N parameters"
>
>This reverts commit 9a86cda07af2 ("drm/i915/dp: reduce link M/N
>parameters")
>
>Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
>---
> drivers/gpu/drm/i915/intel_display.c | 11 -----------
> 1 file changed, 11 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>index 3617927..180709c 100644
>--- a/drivers/gpu/drm/i915/intel_display.c
>+++ b/drivers/gpu/drm/i915/intel_display.c
>@@ -6279,17 +6279,6 @@ intel_reduce_m_n_ratio(uint32_t *num, uint32_t *den)
> static void compute_m_n(unsigned int m, unsigned int n,
> 			uint32_t *ret_m, uint32_t *ret_n)
> {
>-	/*
>-	 * Reduce M/N as much as possible without loss in precision. Several DP
>-	 * dongles in particular seem to be fussy about too large *link* M/N
>-	 * values. The passed in values are more likely to have the least
>-	 * significant bits zero than M after rounding below, so do this first.
>-	 */
>-	while ((m & 1) == 0 && (n & 1) == 0) {
>-		m >>= 1;
>-		n >>= 1;
>-	}
>-
> 	*ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);
> 	*ret_m = div_u64((uint64_t) m * *ret_n, n);
> 	intel_reduce_m_n_ratio(ret_m, ret_n);
>-- 
>2.7.4
>

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Attachments on bug 100755: 130972 | 130973 | 130979 | 130986 | 131053 | 131054 | 131098

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