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drm/i915/bxt: get DSI pixelclock

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BXT's DSI PLL is different from that of VLV. So this patch
adds a new function to get the current DSI pixel clock based
on the PLL divider ratio and lane count.

This function is required for intel_dsi_get_config() function.

v2: Fixed Jani's review comments.

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shashank Sharma 2015-09-01 19:41:46 +05:30 committed by Daniel Vetter
parent baeac68a82
commit ce0c982152
3 changed files with 42 additions and 2 deletions
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8
drivers/gpu/drm/i915/intel_dsi.c
View File

@ -695,7 +695,7 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
static void intel_dsi_get_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
u32 pclk;
u32 pclk = 0;
DRM_DEBUG_KMS("\n");
/*
@ -704,7 +704,11 @@ static void intel_dsi_get_config(struct intel_encoder *encoder,
*/
pipe_config->dpll_hw_state.dpll_md = 0;
pclk = vlv_get_dsi_pclk(encoder, pipe_config->pipe_bpp);
if (IS_BROXTON(encoder->base.dev))
pclk = bxt_get_dsi_pclk(encoder, pipe_config->pipe_bpp);
else if (IS_VALLEYVIEW(encoder->base.dev))
pclk = vlv_get_dsi_pclk(encoder, pipe_config->pipe_bpp);
if (!pclk)
return;

1
drivers/gpu/drm/i915/intel_dsi.h
View File

@ -127,6 +127,7 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
extern void intel_enable_dsi_pll(struct intel_encoder *encoder);
extern void intel_disable_dsi_pll(struct intel_encoder *encoder);
extern u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp);
extern u32 bxt_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp);
extern void intel_dsi_reset_clocks(struct intel_encoder *encoder,
enum port port);

35
drivers/gpu/drm/i915/intel_dsi_pll.c
View File

@ -384,6 +384,41 @@ u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
return pclk;
}
u32 bxt_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
{
u32 pclk;
u32 dsi_clk;
u32 dsi_ratio;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
/* Divide by zero */
if (!pipe_bpp) {
DRM_ERROR("Invalid BPP(0)\n");
return 0;
}
dsi_ratio = I915_READ(BXT_DSI_PLL_CTL) &
BXT_DSI_PLL_RATIO_MASK;
/* Invalid DSI ratio ? */
if (dsi_ratio < BXT_DSI_PLL_RATIO_MIN ||
dsi_ratio > BXT_DSI_PLL_RATIO_MAX) {
DRM_ERROR("Invalid DSI pll ratio(%u) programmed\n", dsi_ratio);
return 0;
}
dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
/* pixel_format and pipe_bpp should agree */
assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
pclk = DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, pipe_bpp);
DRM_DEBUG_DRIVER("Calculated pclk=%u\n", pclk);
return pclk;
}
void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
{
u32 temp;