From c936f44d1b2daea2fd1d52300cab792abe01e28c Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Sat, 12 Jun 2010 14:32:26 +0800 Subject: [PATCH] drm/i915: Calculate cursor watermark under non-SR state for Ironlake The hardware team suggest that the "large buffer" method should be used to calculate the cursor watermark under non-SR state as well, which is to avoid the flicker when FBC is enabled on Ironlake. Signed-off-by: Zhao Yakui Signed-off-by: Zhenyu Wang Signed-off-by: Eric Anholt --- drivers/gpu/drm/i915/i915_reg.h | 3 ++ drivers/gpu/drm/i915/intel_display.c | 56 ++++++++++++++++++++++++++++++++++-- 2 files changed, 56 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 1f741a6..d0ccfa0 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2190,6 +2190,9 @@ #define ILK_DISPLAY_FIFO 128 #define ILK_DISPLAY_MAXWM 64 #define ILK_DISPLAY_DFTWM 8 +#define ILK_CURSOR_FIFO 32 +#define ILK_CURSOR_MAXWM 16 +#define ILK_CURSOR_DFTWM 8 #define ILK_DISPLAY_SR_FIFO 512 #define ILK_DISPLAY_MAX_SRWM 0x1ff diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index b580cd8..cca6ce8 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2590,6 +2590,14 @@ static struct intel_watermark_params ironlake_display_wm_info = { ILK_FIFO_LINE_SIZE }; +static struct intel_watermark_params ironlake_cursor_wm_info = { + ILK_CURSOR_FIFO, + ILK_CURSOR_MAXWM, + ILK_CURSOR_DFTWM, + 2, + ILK_FIFO_LINE_SIZE +}; + static struct intel_watermark_params ironlake_display_srwm_info = { ILK_DISPLAY_SR_FIFO, ILK_DISPLAY_MAX_SRWM, @@ -3142,6 +3150,7 @@ static void i830_update_wm(struct drm_device *dev, int planea_clock, int unused, } #define ILK_LP0_PLANE_LATENCY 700 +#define ILK_LP0_CURSOR_LATENCY 1300 static void ironlake_update_wm(struct drm_device *dev, int planea_clock, int planeb_clock, int sr_hdisplay, int sr_htotal, @@ -3153,6 +3162,21 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, unsigned long line_time_us; int sr_clock, entries_required; u32 reg_value; + int line_count; + int planea_htotal = 0, planeb_htotal = 0; + struct drm_crtc *crtc; + struct intel_crtc *intel_crtc; + + /* Need htotal for all active display plane */ + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { + intel_crtc = to_intel_crtc(crtc); + if (crtc->enabled) { + if (intel_crtc->plane == 0) + planea_htotal = crtc->mode.htotal; + else + planeb_htotal = crtc->mode.htotal; + } + } /* Calculate and update the watermark for plane A */ if (planea_clock) { @@ -3166,7 +3190,20 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, if (planea_wm > (int)ironlake_display_wm_info.max_wm) planea_wm = ironlake_display_wm_info.max_wm; - cursora_wm = 16; + /* Use the large buffer method to calculate cursor watermark */ + line_time_us = (planea_htotal * 1000) / planea_clock; + + /* Use ns/us then divide to preserve precision */ + line_count = (ILK_LP0_CURSOR_LATENCY / line_time_us + 1000) / 1000; + + /* calculate the cursor watermark for cursor A */ + entries_required = line_count * 64 * pixel_size; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_cursor_wm_info.cacheline_size); + cursora_wm = entries_required + ironlake_cursor_wm_info.guard_size; + if (cursora_wm > ironlake_cursor_wm_info.max_wm) + cursora_wm = ironlake_cursor_wm_info.max_wm; + reg_value = I915_READ(WM0_PIPEA_ILK); reg_value &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK); reg_value |= (planea_wm << WM0_PIPE_PLANE_SHIFT) | @@ -3187,7 +3224,20 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, if (planeb_wm > (int)ironlake_display_wm_info.max_wm) planeb_wm = ironlake_display_wm_info.max_wm; - cursorb_wm = 16; + /* Use the large buffer method to calculate cursor watermark */ + line_time_us = (planeb_htotal * 1000) / planeb_clock; + + /* Use ns/us then divide to preserve precision */ + line_count = (ILK_LP0_CURSOR_LATENCY / line_time_us + 1000) / 1000; + + /* calculate the cursor watermark for cursor B */ + entries_required = line_count * 64 * pixel_size; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_cursor_wm_info.cacheline_size); + cursorb_wm = entries_required + ironlake_cursor_wm_info.guard_size; + if (cursorb_wm > ironlake_cursor_wm_info.max_wm) + cursorb_wm = ironlake_cursor_wm_info.max_wm; + reg_value = I915_READ(WM0_PIPEB_ILK); reg_value &= ~(WM0_PIPE_PLANE_MASK | WM0_PIPE_CURSOR_MASK); reg_value |= (planeb_wm << WM0_PIPE_PLANE_SHIFT) | @@ -3202,7 +3252,7 @@ static void ironlake_update_wm(struct drm_device *dev, int planea_clock, * display plane is used. */ if (!planea_clock || !planeb_clock) { - int line_count; + /* Read the self-refresh latency. The unit is 0.5us */ int ilk_sr_latency = I915_READ(MLTR_ILK) & ILK_SRLT_MASK; -- 2.7.4