Commit 7cf41601 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm/i915: clear up backlight #define confusion on gen4+ 



- Regroup definitions for BLC_PWM_CTL so that they're all together and
  and ordered according to the bitfields.

- Add all missing definitions for BLC_PWM_CTL2.

- Use the BLM_ (for backlight modulation) prefix consistently.

- Note that combination mode (i.e. also taking the legacy backlight
  control value from pci config space into account) is gen4 only.

- Move the new registers for PCH-split machines up, they're an almost
  match for the gen4 defitions.  Prefix the special PCH-only bits with
  BLM_PCH_. Also add the pipe C select bit for ivb.

- Rip out the second pair of PCH polarity definitions - they're only
  valid on early (pre-production) ilk silicon.

- Adapt the existing code to use the new definitions. This has the
  nice benefit of killing a magic (1 << 30) left behind be Jesse
  Barnes.

No functional changes in this patch.

Reviewed-by: default avatarEugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 534b5a53

drivers/gpu/drm/i915/i915_reg.h

+35 −20
Original line number Diff line number Diff line
@@ -1807,18 +1807,35 @@ 
#define PFIT_AUTO_RATIOS 0x61238



/* Backlight control */

#define BLC_PWM_CTL		0x61254

#define   BACKLIGHT_MODULATION_FREQ_SHIFT		(17)

#define BLC_PWM_CTL2		0x61250 /* 965+ only */

#define   BLM_COMBINATION_MODE (1 << 30)

#define   BLM_PWM_ENABLE		(1 << 31)

#define   BLM_COMBINATION_MODE		(1 << 30) /* gen4 only */

#define   BLM_PIPE_SELECT		(1 << 29)

#define   BLM_PIPE_SELECT_IVB		(3 << 29)

#define   BLM_PIPE_A			(0 << 29)

#define   BLM_PIPE_B			(1 << 29)

#define   BLM_PIPE_C			(2 << 29) /* ivb + */

#define   BLM_PIPE(pipe)		((pipe) << 29)

#define   BLM_POLARITY_I965		(1 << 28) /* gen4 only */

#define   BLM_PHASE_IN_INTERUPT_STATUS	(1 << 26)

#define   BLM_PHASE_IN_ENABLE		(1 << 25)

#define   BLM_PHASE_IN_INTERUPT_ENABL	(1 << 24)

#define   BLM_PHASE_IN_TIME_BASE_SHIFT	(16)

#define   BLM_PHASE_IN_TIME_BASE_MASK	(0xff << 16)

#define   BLM_PHASE_IN_COUNT_SHIFT	(8)

#define   BLM_PHASE_IN_COUNT_MASK	(0xff << 8)

#define   BLM_PHASE_IN_INCR_SHIFT	(0)

#define   BLM_PHASE_IN_INCR_MASK	(0xff << 0)

#define BLC_PWM_CTL		0x61254

/*

 * This is the most significant 15 bits of the number of backlight cycles in a

 * complete cycle of the modulated backlight control.

 *

 * The actual value is this field multiplied by two.

 */

#define   BACKLIGHT_MODULATION_FREQ_SHIFT	(17)

#define   BACKLIGHT_MODULATION_FREQ_MASK	(0x7fff << 17)

#define   BLM_LEGACY_MODE				(1 << 16)

#define   BLM_LEGACY_MODE			(1 << 16) /* gen2 only */

/*

 * This is the number of cycles out of the backlight modulation cycle for which

 * the backlight is on.
@@ -1833,6 +1850,19 @@ 


#define BLC_HIST_CTL		0x61260



/* New registers for PCH-split platforms. Safe where new bits show up, the

 * register layout machtes with gen4 BLC_PWM_CTL[12]. */

#define BLC_PWM_CPU_CTL2	0x48250

#define BLC_PWM_CPU_CTL		0x48254



/* PCH CTL1 is totally different, all but the below bits are reserved. CTL2 is

 * like the normal CTL from gen4 and earlier. Hooray for confusing naming. */

#define BLC_PWM_PCH_CTL1	0xc8250

#define   BLM_PCH_PWM_ENABLE			(1 << 30)

#define   BLM_PCH_OVERRIDE_ENABLE		(1 << 30)

#define   BLM_PCH_POLARITY			(1 << 29)

#define BLC_PWM_PCH_CTL2	0xc8254



/* TV port control */

#define TV_CTL			0x68000

/** Enables the TV encoder */
@@ -3840,21 +3870,6 @@ 
#define PCH_LVDS	0xe1180

#define  LVDS_DETECTED	(1 << 1)



#define BLC_PWM_CPU_CTL2	0x48250

#define  PWM_ENABLE		(1 << 31)

#define  PWM_PIPE_A		(0 << 29)

#define  PWM_PIPE_B		(1 << 29)

#define BLC_PWM_CPU_CTL		0x48254



#define BLC_PWM_PCH_CTL1	0xc8250

#define  PWM_PCH_ENABLE		(1 << 31)

#define  PWM_POLARITY_ACTIVE_LOW	(1 << 29)

#define  PWM_POLARITY_ACTIVE_HIGH	(0 << 29)

#define  PWM_POLARITY_ACTIVE_LOW2	(1 << 28)

#define  PWM_POLARITY_ACTIVE_HIGH2	(0 << 28)



#define BLC_PWM_PCH_CTL2	0xc8254



#define PCH_PP_STATUS		0xc7200

#define PCH_PP_CONTROL		0xc7204

#define  PANEL_UNLOCK_REGS	(0xabcd << 16)

drivers/gpu/drm/i915/intel_display.c

+2 −2
Original line number Diff line number Diff line
@@ -6895,9 +6895,9 @@ static void ivb_pch_pwm_override(struct drm_device *dev) 
	 * IVB has CPU eDP backlight regs too, set things up to let the

	 * PCH regs control the backlight

	 */

	I915_WRITE(BLC_PWM_CPU_CTL2, PWM_ENABLE);

	I915_WRITE(BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE);

	I915_WRITE(BLC_PWM_CPU_CTL, 0);

	I915_WRITE(BLC_PWM_PCH_CTL1, PWM_ENABLE | (1<<30));

	I915_WRITE(BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE | BLM_PCH_OVERRIDE_ENABLE);

}



void intel_modeset_init_hw(struct drm_device *dev)

drivers/gpu/drm/i915/intel_lvds.c

+6 −6
Original line number Diff line number Diff line
@@ -1081,16 +1081,16 @@ out: 


		/* make sure PWM is enabled and locked to the LVDS pipe */

		pwm = I915_READ(BLC_PWM_CPU_CTL2);

		if (pipe == 0 && (pwm & PWM_PIPE_B))

			I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~PWM_ENABLE);

		if (pipe == 0 && (pwm & BLM_PIPE_B))

			I915_WRITE(BLC_PWM_CPU_CTL2, pwm & ~BLM_PWM_ENABLE);

		if (pipe)

			pwm |= PWM_PIPE_B;

			pwm |= BLM_PIPE_B;

		else

			pwm &= ~PWM_PIPE_B;

		I915_WRITE(BLC_PWM_CPU_CTL2, pwm | PWM_ENABLE);

			pwm &= ~BLM_PIPE_B;

		I915_WRITE(BLC_PWM_CPU_CTL2, pwm | BLM_PWM_ENABLE);



		pwm = I915_READ(BLC_PWM_PCH_CTL1);

		pwm |= PWM_PCH_ENABLE;

		pwm |= BLM_PCH_PWM_ENABLE;

		I915_WRITE(BLC_PWM_PCH_CTL1, pwm);

		/*

		 * Unlock registers and just

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