From 811bbf05447b17db2fb13387da9b7d553438d5c6 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 24 Sep 2013 21:26:25 +0300 Subject: [PATCH] drm/i915: Clarify VLV PLL p1 limits MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit For some reason there's a sort of off by one issue with the p1 divider. The actual p1 limits according to VLV2_DPLL_mphy_hsdpll_frequency_table_ww6_rev1p1.xlsm is 2-3, so we should just say that instead of saying 1-3 and avoiding the 1 via the choice of comparison operator. I don't know why we're using different p1 limits for intel_limits_vlv_dac and intel_limits_vlv_hdmi, but let's preserve that for now. Signed-off-by: Ville Syrjälä Reviewed-by: Mika Kuoppala Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index ed95eb25833a..99c56b8f6462 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -317,7 +317,7 @@ static const intel_limit_t intel_limits_vlv_dac = { .m1 = { .min = 2, .max = 3 }, .m2 = { .min = 11, .max = 156 }, .p = { .min = 10, .max = 30 }, - .p1 = { .min = 1, .max = 3 }, + .p1 = { .min = 2, .max = 3 }, .p2 = { .dot_limit = 270000, .p2_slow = 2, .p2_fast = 20 }, }; @@ -330,7 +330,7 @@ static const intel_limit_t intel_limits_vlv_hdmi = { .m1 = { .min = 2, .max = 3 }, .m2 = { .min = 11, .max = 156 }, .p = { .min = 10, .max = 30 }, - .p1 = { .min = 2, .max = 3 }, + .p1 = { .min = 3, .max = 3 }, .p2 = { .dot_limit = 270000, .p2_slow = 2, .p2_fast = 20 }, }; @@ -688,7 +688,7 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc, /* based on hardware requirement, prefer smaller n to precision */ for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) { - for (clock.p1 = limit->p1.max; clock.p1 > limit->p1.min; clock.p1--) { + for (clock.p1 = limit->p1.max; clock.p1 >= limit->p1.min; clock.p1--) { for (clock.p2 = limit->p2.p2_fast; clock.p2 > 0; clock.p2 -= clock.p2 > 10 ? 2 : 1) { clock.p = clock.p1 * clock.p2; -- 2.30.2