From f573de5a8474ae2cfc28424423c5a68c780a904b Mon Sep 17 00:00:00 2001 From: Shobhit Kumar Date: Wed, 30 Jul 2014 20:32:37 +0530 Subject: drm/i915: Add correct hw/sw config check for DSI encoder Check in vlv_crtc_clock_get if DPLL is enabled before calling dpio read. It will not be enabled for DSI and avoid dpio read WARN dumps. Absence of ->get_config was causing other WARN dumps as well. Update dpll_hw_state as well correctly v2: Address review comments by Daniel - Check if DPLL is enabled rather than checking pipe output type - set adjusted_mode->flags to 0 in compute_config rather than using pipe_config->quirks - Add helper function in intel_dsi_pll.c and use that in intel_dsi.c - updated dpll_hw_state correctly - Updated commit message and title v3: Address review comments by Imre - Proper masking of P1, M1 fields while computing divisors - assert in case of bpp mismatch - guard for divide by 0 while computing pclk - Use ARRAY_SIZE instead of direct calculation Signed-off-by: Shobhit Kumar Reviewed-by: Imre Deak Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dsi_pll.c | 81 ++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) (limited to 'drivers/gpu/drm/i915/intel_dsi_pll.c') diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c index ba79ec19da3b..d8bb1ea2f0da 100644 --- a/drivers/gpu/drm/i915/intel_dsi_pll.c +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c @@ -298,3 +298,84 @@ void vlv_disable_dsi_pll(struct intel_encoder *encoder) mutex_unlock(&dev_priv->dpio_lock); } + +static void assert_bpp_mismatch(int pixel_format, int pipe_bpp) +{ + int bpp; + + switch (pixel_format) { + default: + case VID_MODE_FORMAT_RGB888: + case VID_MODE_FORMAT_RGB666_LOOSE: + bpp = 24; + break; + case VID_MODE_FORMAT_RGB666: + bpp = 18; + break; + case VID_MODE_FORMAT_RGB565: + bpp = 16; + break; + } + + WARN(bpp != pipe_bpp, + "bpp match assertion failure (expected %d, current %d)\n", + bpp, pipe_bpp); +} + +u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp) +{ + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + u32 dsi_clock, pclk; + u32 pll_ctl, pll_div; + u32 m = 0, p = 0; + int refclk = 25000; + int i; + + DRM_DEBUG_KMS("\n"); + + mutex_lock(&dev_priv->dpio_lock); + pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL); + pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER); + mutex_unlock(&dev_priv->dpio_lock); + + /* mask out other bits and extract the P1 divisor */ + pll_ctl &= DSI_PLL_P1_POST_DIV_MASK; + pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2); + + /* mask out the other bits and extract the M1 divisor */ + pll_div &= DSI_PLL_M1_DIV_MASK; + pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT; + + while (pll_ctl) { + pll_ctl = pll_ctl >> 1; + p++; + } + p--; + + if (!p) { + DRM_ERROR("wrong P1 divisor\n"); + return 0; + } + + for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) { + if (lfsr_converts[i] == pll_div) + break; + } + + if (i == ARRAY_SIZE(lfsr_converts)) { + DRM_ERROR("wrong m_seed programmed\n"); + return 0; + } + + m = i + 62; + + dsi_clock = (m * refclk) / p; + + /* pixel_format and pipe_bpp should agree */ + assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp); + + pclk = DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, pipe_bpp); + + return pclk; +} -- cgit v1.2.3