From 6248017ae5301ccb51cda92c4117b573b9aff6bb Mon Sep 17 00:00:00 2001 From: Arthur Heymans Date: Wed, 1 Feb 2017 00:50:26 +0100 Subject: [PATCH] drm/i915: Get correct display clock on 945gm MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This is according to Mobile Intel® 945 Express Chipset Family datasheet. Signed-off-by: Arthur Heymans Link: http://patchwork.freedesktop.org/patch/msgid/20170131235026.26003-1-arthur@aheymans.xyz Reviewed-by: Ville Syrjälä Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/i915/i915_reg.h | 2 +- drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++++++++++++-- 2 files changed, 26 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a9538ae81673..4b5761d7716c 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -119,7 +119,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg) #define GCFGC 0xf0 /* 915+ only */ #define GC_LOW_FREQUENCY_ENABLE (1 << 7) #define GC_DISPLAY_CLOCK_190_200_MHZ (0 << 4) -#define GC_DISPLAY_CLOCK_333_MHZ (4 << 4) +#define GC_DISPLAY_CLOCK_333_320_MHZ (4 << 4) #define GC_DISPLAY_CLOCK_267_MHZ_PNV (0 << 4) #define GC_DISPLAY_CLOCK_333_MHZ_PNV (1 << 4) #define GC_DISPLAY_CLOCK_444_MHZ_PNV (2 << 4) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 45e587496886..d0d042495dc7 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7411,6 +7411,26 @@ static int i945_get_display_clock_speed(struct drm_i915_private *dev_priv) return 400000; } +static int i945gm_get_display_clock_speed(struct drm_i915_private *dev_priv) +{ + struct pci_dev *pdev = dev_priv->drm.pdev; + u16 gcfgc = 0; + + pci_read_config_word(pdev, GCFGC, &gcfgc); + + if (gcfgc & GC_LOW_FREQUENCY_ENABLE) + return 133333; + else { + switch (gcfgc & GC_DISPLAY_CLOCK_MASK) { + case GC_DISPLAY_CLOCK_333_320_MHZ: + return 320000; + default: + case GC_DISPLAY_CLOCK_190_200_MHZ: + return 200000; + } + } +} + static int i915_get_display_clock_speed(struct drm_i915_private *dev_priv) { return 333333; @@ -7457,7 +7477,7 @@ static int i915gm_get_display_clock_speed(struct drm_i915_private *dev_priv) return 133333; else { switch (gcfgc & GC_DISPLAY_CLOCK_MASK) { - case GC_DISPLAY_CLOCK_333_MHZ: + case GC_DISPLAY_CLOCK_333_320_MHZ: return 333333; default: case GC_DISPLAY_CLOCK_190_200_MHZ: @@ -16268,9 +16288,12 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv) else if (IS_I915G(dev_priv)) dev_priv->display.get_display_clock_speed = i915_get_display_clock_speed; - else if (IS_I945GM(dev_priv) || IS_I845G(dev_priv)) + else if (IS_I845G(dev_priv)) dev_priv->display.get_display_clock_speed = i9xx_misc_get_display_clock_speed; + else if (IS_I945GM(dev_priv)) + dev_priv->display.get_display_clock_speed = + i945gm_get_display_clock_speed; else if (IS_I915GM(dev_priv)) dev_priv->display.get_display_clock_speed = i915gm_get_display_clock_speed; -- 2.30.2