Re: [PATCH] drm/i915/bxt: Additional MIPI clock divider form B0 stepping onwards

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> -----Original Message-----
> From: Jani Nikula [mailto:jani.nikula@xxxxxxxxxxxxxxx]
> Sent: Thursday, February 4, 2016 6:29 PM
> To: Deepak, M <m.deepak@xxxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Deepak, M <m.deepak@xxxxxxxxx>
> Subject: Re:  [PATCH] drm/i915/bxt: Additional MIPI clock divider
> form B0 stepping onwards
> 
> On Wed, 03 Feb 2016, Deepak M <m.deepak@xxxxxxxxx> wrote:
> > The MIPI clock calculations for the addtional clock are revised from
> > B0 stepping onwards, the bit definitions have changed compared to old
> > stepping.
> >
> > v2: Fixing compilation warning.
> 
> Why did you move and rename everything when it was not needed?
> 
> BR,
> Jani.
> 
[Deepak, M] I have deleted the old macro and added the new as per the new definitions. With the new bit fields nothing was matching as that of the old. 
> 
> >
> > Signed-off-by: Deepak M <m.deepak@xxxxxxxxx>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h      | 104 +++++++++++++++++------------
> ------
> >  drivers/gpu/drm/i915/intel_dsi_pll.c |  64 ++++++++++++++-------
> >  2 files changed, 95 insertions(+), 73 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h index c0bd691..2568f35 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7638,6 +7638,57 @@ enum skl_disp_power_wells {
> >
> >  /* MIPI DSI registers */
> >
> > +#define  BXT_MIPI1_RX_LOWER_SHIFT		16
> > +#define  BXT_MIPI2_RX_LOWER_SHIFT		0
> > +#define  BXT_MIPI_RX_LOWER_SHIFT(port)	\
> > +			_MIPI_PORT(port, BXT_MIPI1_RX_LOWER_SHIFT, \
> > +				BXT_MIPI2_RX_LOWER_SHIFT)
> > +#define  BXT_MIPI1_RX_LOWER_DIVIDER_MASK	(3 << 16)
> > +#define  BXT_MIPI2_RX_LOWER_DIVIDER_MASK	(3 << 0)
> > +#define  BXT_MIPI_RX_LOWER_DIVIDER_MASK(port)	\
> > +			(3 << BXT_MIPI_RX_LOWER_SHIFT(port))
> > +#define  BXT_MIPI_RX_LOWER_DIVIDER(port, val)	\
> > +			((val & 3) << BXT_MIPI_RX_LOWER_SHIFT(port))
> > +
> > +#define  BXT_MIPI1_8X_BY3_SHIFT		19
> > +#define  BXT_MIPI2_8X_BY3_SHIFT		3
> > +#define  BXT_MIPI_8X_BY3_SHIFT(port)          \
> > +			_MIPI_PORT(port, BXT_MIPI1_8X_BY3_SHIFT, \
> > +				BXT_MIPI2_8X_BY3_SHIFT)
> > +#define  BXT_MIPI1_8X_BY3_DIVIDER_MASK		(3 << 19)
> > +#define  BXT_MIPI2_8X_BY3_DIVIDER_MASK		(3 << 3)
> > +#define  BXT_MIPI_8X_BY3_DIVIDER_MASK(port)	\
> > +			(3 << BXT_MIPI_8X_BY3_SHIFT(port))
> > +#define  BXT_MIPI_8X_BY3_DIVIDER(port, val)	\
> > +			((val & 3) << BXT_MIPI_8X_BY3_SHIFT(port))
> > +
> > +#define  BXT_MIPI1_RX_UPPER_SHIFT		21
> > +#define  BXT_MIPI2_RX_UPPER_SHIFT		5
> > +#define  BXT_MIPI_RX_UPPER_SHIFT(port)	\
> > +			_MIPI_PORT(port, BXT_MIPI1_RX_UPPER_SHIFT, \
> > +				BXT_MIPI2_RX_UPPER_SHIFT)
> > +#define  BXT_MIPI1_RX_UPPER_DIVIDER_MASK	(3 << 21)
> > +#define  BXT_MIPI2_RX_UPPER_DIVIDER_MASK	(3 << 5)
> > +#define  BXT_MIPI_RX_UPPER_DIVIDER_MASK(port)	\
> > +			(3 << BXT_MIPI_RX_UPPER_SHIFT(port))
> > +#define  BXT_MIPI_RX_UPPER_DIVIDER(port, val)	\
> > +			((val & 3) << BXT_MIPI_RX_UPPER_SHIFT(port))
> > +
> > +#define  BXT_MIPI1_TX_SHIFT			26
> > +#define  BXT_MIPI2_TX_SHIFT			10
> > +#define  BXT_MIPI_TX_SHIFT(port)		\
> > +		_MIPI_PORT(port, BXT_MIPI1_TX_SHIFT, \
> > +				BXT_MIPI2_TX_SHIFT)
> > +#define  BXT_MIPI1_TX_DIVIDER_MASK		(0x3F << 26)
> > +#define  BXT_MIPI2_TX_DIVIDER_MASK		(0x3F << 10)
> > +#define  BXT_MIPI_TX_DIVIDER_MASK(port)		\
> > +			(0x3F << BXT_MIPI_TX_SHIFT(port))
> > +#define  BXT_MIPI_TX_DIVIDER(port, val)	\
> > +			((val & 0x3F) << BXT_MIPI_TX_SHIFT(port))
> > +
> > +#define RX_DIVIDER_BIT_1_2			0x3
> > +#define RX_DIVIDER_BIT_3_4			0xC
> > +
> >  #define _MIPI_PORT(port, a, c)	_PORT3(port, a, 0, c)	/* ports A
> and C only */
> >  #define _MMIO_MIPI(port, a, c)	_MMIO(_MIPI_PORT(port, a, c))
> >
> > @@ -7650,59 +7701,6 @@ enum skl_disp_power_wells {
> >  #define  BXT_MIPI_DIV_SHIFT(port)		\
> >  			_MIPI_PORT(port, BXT_MIPI1_DIV_SHIFT, \
> >  					BXT_MIPI2_DIV_SHIFT)
> > -/* Var clock divider to generate TX source. Result must be < 39.5 M */
> > -#define  BXT_MIPI1_ESCLK_VAR_DIV_MASK		(0x3F << 26)
> > -#define  BXT_MIPI2_ESCLK_VAR_DIV_MASK		(0x3F << 10)
> > -#define  BXT_MIPI_ESCLK_VAR_DIV_MASK(port)	\
> > -			_MIPI_PORT(port,
> BXT_MIPI1_ESCLK_VAR_DIV_MASK, \
> > -
> 	BXT_MIPI2_ESCLK_VAR_DIV_MASK)
> > -
> > -#define  BXT_MIPI_ESCLK_VAR_DIV(port, val)	\
> > -			(val << BXT_MIPI_DIV_SHIFT(port))
> > -/* TX control divider to select actual TX clock output from (8x/var) */
> > -#define  BXT_MIPI1_TX_ESCLK_SHIFT		21
> > -#define  BXT_MIPI2_TX_ESCLK_SHIFT		5
> > -#define  BXT_MIPI_TX_ESCLK_SHIFT(port)		\
> > -			_MIPI_PORT(port, BXT_MIPI1_TX_ESCLK_SHIFT, \
> > -					BXT_MIPI2_TX_ESCLK_SHIFT)
> > -#define  BXT_MIPI1_TX_ESCLK_FIXDIV_MASK		(3 << 21)
> > -#define  BXT_MIPI2_TX_ESCLK_FIXDIV_MASK		(3 << 5)
> > -#define  BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port)	\
> > -			_MIPI_PORT(port,
> BXT_MIPI1_TX_ESCLK_FIXDIV_MASK, \
> > -
> 	BXT_MIPI2_TX_ESCLK_FIXDIV_MASK)
> > -#define  BXT_MIPI_TX_ESCLK_8XDIV_BY2(port)	\
> > -		(0x0 << BXT_MIPI_TX_ESCLK_SHIFT(port))
> > -#define  BXT_MIPI_TX_ESCLK_8XDIV_BY4(port)	\
> > -		(0x1 << BXT_MIPI_TX_ESCLK_SHIFT(port))
> > -#define  BXT_MIPI_TX_ESCLK_8XDIV_BY8(port)	\
> > -		(0x2 << BXT_MIPI_TX_ESCLK_SHIFT(port))
> > -/* RX control divider to select actual RX clock output from 8x*/
> > -#define  BXT_MIPI1_RX_ESCLK_SHIFT		19
> > -#define  BXT_MIPI2_RX_ESCLK_SHIFT		3
> > -#define  BXT_MIPI_RX_ESCLK_SHIFT(port)		\
> > -			_MIPI_PORT(port, BXT_MIPI1_RX_ESCLK_SHIFT, \
> > -					BXT_MIPI2_RX_ESCLK_SHIFT)
> > -#define  BXT_MIPI1_RX_ESCLK_FIXDIV_MASK		(3 << 19)
> > -#define  BXT_MIPI2_RX_ESCLK_FIXDIV_MASK		(3 << 3)
> > -#define  BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port)	\
> > -		(3 << BXT_MIPI_RX_ESCLK_SHIFT(port))
> > -#define  BXT_MIPI_RX_ESCLK_8X_BY2(port)	\
> > -		(1 << BXT_MIPI_RX_ESCLK_SHIFT(port))
> > -#define  BXT_MIPI_RX_ESCLK_8X_BY3(port)	\
> > -		(2 << BXT_MIPI_RX_ESCLK_SHIFT(port))
> > -#define  BXT_MIPI_RX_ESCLK_8X_BY4(port)	\
> > -		(3 << BXT_MIPI_RX_ESCLK_SHIFT(port))
> > -/* BXT-A WA: Always prog DPHY dividers to 00 */
> > -#define  BXT_MIPI1_DPHY_DIV_SHIFT		16
> > -#define  BXT_MIPI2_DPHY_DIV_SHIFT		0
> > -#define  BXT_MIPI_DPHY_DIV_SHIFT(port)		\
> > -			_MIPI_PORT(port, BXT_MIPI1_DPHY_DIV_SHIFT, \
> > -					BXT_MIPI2_DPHY_DIV_SHIFT)
> > -#define  BXT_MIPI_1_DPHY_DIVIDER_MASK		(3 << 16)
> > -#define  BXT_MIPI_2_DPHY_DIVIDER_MASK		(3 << 0)
> > -#define  BXT_MIPI_DPHY_DIVIDER_MASK(port)	\
> > -		(3 << BXT_MIPI_DPHY_DIV_SHIFT(port))
> > -
> >  /* BXT MIPI mode configure */
> >  #define  _BXT_MIPIA_TRANS_HACTIVE			0x6B0F8
> >  #define  _BXT_MIPIC_TRANS_HACTIVE			0x6B8F8
> > diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c
> > b/drivers/gpu/drm/i915/intel_dsi_pll.c
> > index bb5e95a..7435115 100644
> > --- a/drivers/gpu/drm/i915/intel_dsi_pll.c
> > +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
> > @@ -362,35 +362,59 @@ static void vlv_dsi_reset_clocks(struct
> > intel_encoder *encoder, enum port port)
> >  /* Program BXT Mipi clocks and dividers */  static void
> > bxt_dsi_program_clocks(struct drm_device *dev, enum port port)  {
> > -	u32 tmp;
> > -	u32 divider;
> > -	u32 dsi_rate;
> > -	u32 pll_ratio;
> >  	struct drm_i915_private *dev_priv = dev->dev_private;
> > +	u32 tmp;
> > +	u32 dsi_rate = 0;
> > +	u32 pll_ratio = 0;
> > +	u32 rx_div;
> > +	u32 tx_div;
> > +	u32 rx_div_upper;
> > +	u32 rx_div_lower;
> > +	u32 mipi_8by3_divider;
> >
> >  	/* Clear old configurations */
> >  	tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
> > -	tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_RX_LOWER_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_RX_UPPER_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_TX_DIVIDER_MASK(port));
> >
> >  	/* Get the current DSI rate(actual) */
> >  	pll_ratio = I915_READ(BXT_DSI_PLL_CTL) &
> > -				BXT_DSI_PLL_RATIO_MASK;
> > +					BXT_DSI_PLL_RATIO_MASK;
> > +
> > +	/* To get 8X clock, divide ref_freq * pll ratio by 2 as per bspec */
> >  	dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
> >
> > -	/* Max possible output of clock is 39.5 MHz, program value -1 */
> > -	divider = (dsi_rate / BXT_MAX_VAR_OUTPUT_KHZ) - 1;
> > -	tmp |= BXT_MIPI_ESCLK_VAR_DIV(port, divider);
> > +	/*
> > +	 * tx clock should be <= 20MHz and the div value must be
> > +	 * subtracted by 1 as per bspec
> > +	 */
> > +	tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1;
> > +	/*
> > +	 * rx clock should be <= 150MHz and the div value must be
> > +	 * subtracted by 1 as per bspec
> > +	 */
> > +	rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1;
> >
> >  	/*
> > -	 * Tx escape clock must be as close to 20MHz possible, but should
> > -	 * not exceed it. Hence select divide by 2
> > +	 * rx divider value needs to be updated in the
> > +	 * two differnt bit fields in the register hence splitting the
> > +	 * rx divider value accordingly
> >  	 */
> > -	tmp |= BXT_MIPI_TX_ESCLK_8XDIV_BY2(port);
> > +	rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2;
> > +	rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2;
> > +
> > +	/* As per bpsec program the 8/3X clock divider to the below value */
> > +	if (dev_priv->vbt.dsi.config->is_cmd_mode)
> > +		mipi_8by3_divider = 0x2;
> > +	else
> > +		mipi_8by3_divider = 0x3;
> >
> > -	tmp |= BXT_MIPI_RX_ESCLK_8X_BY3(port);
> > +	tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider);
> > +	tmp |= BXT_MIPI_TX_DIVIDER(port, tx_div);
> > +	tmp |= BXT_MIPI_RX_LOWER_DIVIDER(port, rx_div_lower);
> > +	tmp |= BXT_MIPI_RX_UPPER_DIVIDER(port, rx_div_upper);
> >
> >  	I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);  } @@ -512,10 +536,10
> @@ static
> > void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port
> > port)
> >
> >  	/* Clear old configurations */
> >  	tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
> > -	tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
> > -	tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_RX_LOWER_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_RX_UPPER_DIVIDER_MASK(port));
> > +	tmp &= ~(BXT_MIPI_TX_DIVIDER_MASK(port));
> >  	I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
> >  	I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);  }
> 
> --
> Jani Nikula, Intel Open Source Technology Center
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