[Intel-gfx] [PATCH] drm/i915/psr: Program default IO buffer Wake and Fast Wake

[Souza, Jose]

On Fri, 2020-06-05 at 03:23 +0300, Gwan-gyeong Mun wrote:
> The IO buffer Wake and Fast Wake bit size and value have been changed from
> Gen12+.
> It programs default value of IO buffer Wake and Fast Wake on Gen12+.
> 
> - Pre Gen12
>   Bit location: IO buffer Wake: Register_PSR2_CTL[14:13]
>                 Fast Wake: Register_PSR2_CTL[12:11]
> 
>   Value: 0x0: 8 lines
>          0x1: 7 lines
>          0x2: 6 lines
>          0x3: 5 lines
> 
> - Gen12+
>   Bit location: IO buffer Wake: Register_PSR2_CTL[15:13]
>                 Fast Wake: Register_PSR2_CTL[12:10]
> 
>   Value: 0x0: 5 lines
>          0x1: 6 lines
>          0x2: 7 lines
>          0x3: 8 lines
>          0x4: 9 lines
>          0x5: 10 lines
>          0x6: 11 lines
>          0x7: 12 lines

If you define the macro like bellow you don't need to add this information to the commit description.

> 
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 19 +++++++++++++++++++
>  drivers/gpu/drm/i915/i915_reg.h          |  6 ++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index b7a2c102648a..de2a17fe8860 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -518,6 +518,25 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
>  	else
>  		val |= EDP_PSR2_TP2_TIME_2500us;
>  
> +	if (INTEL_GEN(dev_priv) >= 12) {
> +		/*
> +		 * TODO: In order to setting an optimal power consumption,
> +		 * lower than 4k resoluition mode needs to decrese IO_BUFFER_WAKE
> +		 * and FAST_WAKE. And higher than 4K resolution mode needs
> +		 * to increase IO_BUFFER_WAKE and FAST_WAKE.
> +		 */
> +		u32 io_buffer_wake = 0x2; /* default BSpec value, 7 lines */
> +		u32 fast_wake = 0x2; /* default BSpec value, 7 lines */
> +
> +		/*
> +		 * To program line 9 to 12 on IO_BUFFER_WAKE and FAST_WAKE,
> +		 * EDP_PSR2_CTL should be set EDP_PSR2_BLOCK_COUNT_NUM_3.
> +		 */
> +		val |= EDP_PSR2_BLOCK_COUNT_NUM_2;
> +		val |= EDP_PSR2_IO_BUFFER_WAKE(io_buffer_wake);
> +		val |= EDP_PSR2_FAST_WAKE(fast_wake);

The parameter for this 2 macros should be the number of the lines not the bit value.
As you are at it, please set the GEN9+ default values, the TGL macros will need a "TGL_" prefix.


> +
>  	/*
>  	 * PSR2 HW is incorrectly using EDP_PSR_TP1_TP3_SEL and BSpec is
>  	 * recommending keep this bit unset while PSR2 is enabled.
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 96d351fbeebb..d055b7d93a5d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4514,10 +4514,16 @@ enum {
>  #define EDP_PSR2_CTL(tran)		_MMIO_TRANS2(tran, _PSR2_CTL_A)
>  #define   EDP_PSR2_ENABLE		(1 << 31)
>  #define   EDP_SU_TRACK_ENABLE		(1 << 30)
> +#define   EDP_PSR2_BLOCK_COUNT_NUM_2	(0 << 28) /* TGL+ */
> +#define   EDP_PSR2_BLOCK_COUNT_NUM_3	(1 << 28) /* TGL+ */
>  #define   EDP_Y_COORDINATE_VALID	(1 << 26) /* GLK and CNL+ */
>  #define   EDP_Y_COORDINATE_ENABLE	(1 << 25) /* GLK and CNL+ */
>  #define   EDP_MAX_SU_DISABLE_TIME(t)	((t) << 20)
>  #define   EDP_MAX_SU_DISABLE_TIME_MASK	(0x1f << 20)
> +#define   EDP_PSR2_IO_BUFFER_WAKE(a)	((a) << 13)
> +#define   EDP_PSR2_IO_BUFFER_WAKE_MASK	(0x7 << 13) /* TGL+ */
> +#define   EDP_PSR2_FAST_WAKE(a)		((a) << 10) /* TGL+ */
> +#define   EDP_PSR2_FAST_WAKE_MASK	(0x7 << 10) /* TGL+ */
>  #define   EDP_PSR2_TP2_TIME_500us	(0 << 8)
>  #define   EDP_PSR2_TP2_TIME_100us	(1 << 8)
>  #define   EDP_PSR2_TP2_TIME_2500us	(2 << 8)