From: Zhenyu Wang Date: Thu, 1 Apr 2010 05:07:53 +0000 (+0800) Subject: drm/i915: Add the support of memory self-refresh on Ironlake X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7f8a85698f5c8a981641ec0bdf9926768786db9d;p=linux-beck.git drm/i915: Add the support of memory self-refresh on Ironlake Update the self-refresh watermark for display plane/cursor and enable the memory self-refresh on Ironlake. The watermark is also updated for the active display plane. More than 1W idle power is saved on one Ironlake laptop after enabling memory self-refresh. Signed-off-by: Zhao Yakui Signed-off-by: Zhenyu Wang --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 6d8bf6220e19..527d30aecda2 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2030,6 +2030,43 @@ #define PINEVIEW_CURSOR_DFT_WM 0 #define PINEVIEW_CURSOR_GUARD_WM 5 + +/* define the Watermark register on Ironlake */ +#define WM0_PIPEA_ILK 0x45100 +#define WM0_PIPE_PLANE_MASK (0x7f<<16) +#define WM0_PIPE_PLANE_SHIFT 16 +#define WM0_PIPE_SPRITE_MASK (0x3f<<8) +#define WM0_PIPE_SPRITE_SHIFT 8 +#define WM0_PIPE_CURSOR_MASK (0x1f) + +#define WM0_PIPEB_ILK 0x45104 +#define WM1_LP_ILK 0x45108 +#define WM1_LP_SR_EN (1<<31) +#define WM1_LP_LATENCY_SHIFT 24 +#define WM1_LP_LATENCY_MASK (0x7f<<24) +#define WM1_LP_SR_MASK (0x1ff<<8) +#define WM1_LP_SR_SHIFT 8 +#define WM1_LP_CURSOR_MASK (0x3f) + +/* Memory latency timer register */ +#define MLTR_ILK 0x11222 +/* the unit of memory self-refresh latency time is 0.5us */ +#define ILK_SRLT_MASK 0x3f + +/* define the fifo size on Ironlake */ +#define ILK_DISPLAY_FIFO 128 +#define ILK_DISPLAY_MAXWM 64 +#define ILK_DISPLAY_DFTWM 8 + +#define ILK_DISPLAY_SR_FIFO 512 +#define ILK_DISPLAY_MAX_SRWM 0x1ff +#define ILK_DISPLAY_DFT_SRWM 0x3f +#define ILK_CURSOR_SR_FIFO 64 +#define ILK_CURSOR_MAX_SRWM 0x3f +#define ILK_CURSOR_DFT_SRWM 8 + +#define ILK_FIFO_LINE_SIZE 64 + /* * The two pipe frame counter registers are not synchronized, so * reading a stable value is somewhat tricky. The following code @@ -2310,8 +2347,15 @@ #define GTIIR 0x44018 #define GTIER 0x4401c +#define ILK_DISPLAY_CHICKEN2 0x42004 +#define ILK_DPARB_GATE (1<<22) +#define ILK_VSDPFD_FULL (1<<21) +#define ILK_DSPCLK_GATE 0x42020 +#define ILK_DPARB_CLK_GATE (1<<5) + #define DISP_ARB_CTL 0x45000 #define DISP_TILE_SURFACE_SWIZZLING (1<<13) +#define DISP_FBC_WM_DIS (1<<15) /* PCH */ diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e38c9068a04e..9fdea06f3e73 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2527,6 +2527,30 @@ static struct intel_watermark_params i830_wm_info = { I830_FIFO_LINE_SIZE }; +static struct intel_watermark_params ironlake_display_wm_info = { + ILK_DISPLAY_FIFO, + ILK_DISPLAY_MAXWM, + ILK_DISPLAY_DFTWM, + 2, + ILK_FIFO_LINE_SIZE +}; + +static struct intel_watermark_params ironlake_display_srwm_info = { + ILK_DISPLAY_SR_FIFO, + ILK_DISPLAY_MAX_SRWM, + ILK_DISPLAY_DFT_SRWM, + 2, + ILK_FIFO_LINE_SIZE +}; + +static struct intel_watermark_params ironlake_cursor_srwm_info = { + ILK_CURSOR_SR_FIFO, + ILK_CURSOR_MAX_SRWM, + ILK_CURSOR_DFT_SRWM, + 2, + ILK_FIFO_LINE_SIZE +}; + /** * intel_calculate_wm - calculate watermark level * @clock_in_khz: pixel clock @@ -3014,6 +3038,108 @@ static void i830_update_wm(struct drm_device *dev, int planea_clock, int unused, I915_WRITE(FW_BLC, fwater_lo); } +#define ILK_LP0_PLANE_LATENCY 700 + +static void ironlake_update_wm(struct drm_device *dev, int planea_clock, + int planeb_clock, int sr_hdisplay, int pixel_size) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + int planea_wm, planeb_wm, cursora_wm, cursorb_wm; + int sr_wm, cursor_wm; + unsigned long line_time_us; + int sr_clock, entries_required; + u32 reg_value; + + /* Calculate and update the watermark for plane A */ + if (planea_clock) { + entries_required = ((planea_clock / 1000) * pixel_size * + ILK_LP0_PLANE_LATENCY) / 1000; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_display_wm_info.cacheline_size); + planea_wm = entries_required + + ironlake_display_wm_info.guard_size; + + if (planea_wm > (int)ironlake_display_wm_info.max_wm) + planea_wm = ironlake_display_wm_info.max_wm; + + cursora_wm = 16; + 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) | + (cursora_wm & WM0_PIPE_CURSOR_MASK); + I915_WRITE(WM0_PIPEA_ILK, reg_value); + DRM_DEBUG_KMS("FIFO watermarks For pipe A - plane %d, " + "cursor: %d\n", planea_wm, cursora_wm); + } + /* Calculate and update the watermark for plane B */ + if (planeb_clock) { + entries_required = ((planeb_clock / 1000) * pixel_size * + ILK_LP0_PLANE_LATENCY) / 1000; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_display_wm_info.cacheline_size); + planeb_wm = entries_required + + ironlake_display_wm_info.guard_size; + + if (planeb_wm > (int)ironlake_display_wm_info.max_wm) + planeb_wm = ironlake_display_wm_info.max_wm; + + cursorb_wm = 16; + 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) | + (cursorb_wm & WM0_PIPE_CURSOR_MASK); + I915_WRITE(WM0_PIPEB_ILK, reg_value); + DRM_DEBUG_KMS("FIFO watermarks For pipe B - plane %d, " + "cursor: %d\n", planeb_wm, cursorb_wm); + } + + /* + * Calculate and update the self-refresh watermark only when one + * 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; + + sr_clock = planea_clock ? planea_clock : planeb_clock; + line_time_us = ((sr_hdisplay * 1000) / sr_clock); + + /* Use ns/us then divide to preserve precision */ + line_count = ((ilk_sr_latency * 500) / line_time_us + 1000) + / 1000; + + /* calculate the self-refresh watermark for display plane */ + entries_required = line_count * sr_hdisplay * pixel_size; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_display_srwm_info.cacheline_size); + sr_wm = entries_required + + ironlake_display_srwm_info.guard_size; + + /* calculate the self-refresh watermark for display cursor */ + entries_required = line_count * pixel_size * 64; + entries_required = DIV_ROUND_UP(entries_required, + ironlake_cursor_srwm_info.cacheline_size); + cursor_wm = entries_required + + ironlake_cursor_srwm_info.guard_size; + + /* configure watermark and enable self-refresh */ + reg_value = I915_READ(WM1_LP_ILK); + reg_value &= ~(WM1_LP_LATENCY_MASK | WM1_LP_SR_MASK | + WM1_LP_CURSOR_MASK); + reg_value |= WM1_LP_SR_EN | + (ilk_sr_latency << WM1_LP_LATENCY_SHIFT) | + (sr_wm << WM1_LP_SR_SHIFT) | cursor_wm; + + I915_WRITE(WM1_LP_ILK, reg_value); + DRM_DEBUG_KMS("self-refresh watermark: display plane %d " + "cursor %d\n", sr_wm, cursor_wm); + + } else { + /* Turn off self refresh if both pipes are enabled */ + I915_WRITE(WM1_LP_ILK, I915_READ(WM1_LP_ILK) & ~WM1_LP_SR_EN); + } +} /** * intel_update_watermarks - update FIFO watermark values based on current modes * @@ -4973,6 +5099,25 @@ void intel_init_clock_gating(struct drm_device *dev) } I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate); + + /* + * According to the spec the following bits should be set in + * order to enable memory self-refresh + * The bit 22/21 of 0x42004 + * The bit 5 of 0x42020 + * The bit 15 of 0x45000 + */ + if (IS_IRONLAKE(dev)) { + I915_WRITE(ILK_DISPLAY_CHICKEN2, + (I915_READ(ILK_DISPLAY_CHICKEN2) | + ILK_DPARB_GATE | ILK_VSDPFD_FULL)); + I915_WRITE(ILK_DSPCLK_GATE, + (I915_READ(ILK_DSPCLK_GATE) | + ILK_DPARB_CLK_GATE)); + I915_WRITE(DISP_ARB_CTL, + (I915_READ(DISP_ARB_CTL) | + DISP_FBC_WM_DIS)); + } return; } else if (IS_G4X(dev)) { uint32_t dspclk_gate; @@ -5088,9 +5233,18 @@ static void intel_init_display(struct drm_device *dev) i830_get_display_clock_speed; /* For FIFO watermark updates */ - if (HAS_PCH_SPLIT(dev)) - dev_priv->display.update_wm = NULL; - else if (IS_PINEVIEW(dev)) { + if (HAS_PCH_SPLIT(dev)) { + if (IS_IRONLAKE(dev)) { + if (I915_READ(MLTR_ILK) & ILK_SRLT_MASK) + dev_priv->display.update_wm = ironlake_update_wm; + else { + DRM_DEBUG_KMS("Failed to get proper latency. " + "Disable CxSR\n"); + dev_priv->display.update_wm = NULL; + } + } else + dev_priv->display.update_wm = NULL; + } else if (IS_PINEVIEW(dev)) { if (!intel_get_cxsr_latency(IS_PINEVIEW_G(dev), dev_priv->fsb_freq, dev_priv->mem_freq)) {