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Commit 9476ed2e authored by Russell King's avatar Russell King
Browse files

drm/i2c: tda998x: power down pre-filter and color conversion 



Disabling the pre-filter block of the TDA998x saves 40mW and the colour
conversion block saves 15mW.  As we always disable these two blocks, we
can power these sections of the chip down to save 55mW of unnecessary
power consumption.

Tested-by: default avatarBrian Starkey <brian.starkey@arm.com>
Reviewed-by: default avatarBrian Starkey <brian.starkey@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent 3cb43378

drivers/gpu/drm/i2c/tda998x_drv.c

+4 −0
Original line number Diff line number Diff line
@@ -107,6 +107,8 @@ struct tda998x_priv { 
# define I2C_MASTER_DIS_FILT      (1 << 1)

# define I2C_MASTER_APP_STRT_LAT  (1 << 2)

#define REG_FEAT_POWERDOWN        REG(0x00, 0x0e)     /* read/write */

# define FEAT_POWERDOWN_PREFILT   BIT(0)

# define FEAT_POWERDOWN_CSC       BIT(1)

# define FEAT_POWERDOWN_SPDIF     (1 << 3)

#define REG_INT_FLAGS_0           REG(0x00, 0x0f)     /* read/write */

#define REG_INT_FLAGS_1           REG(0x00, 0x10)     /* read/write */
@@ -1284,6 +1286,7 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, 
	/* no pre-filter or interpolator: */

	reg_write(priv, REG_HVF_CNTRL_0, HVF_CNTRL_0_PREFIL(0) |

			HVF_CNTRL_0_INTPOL(0));

	reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_PREFILT);

	reg_write(priv, REG_VIP_CNTRL_5, VIP_CNTRL_5_SP_CNT(0));

	reg_write(priv, REG_VIP_CNTRL_4, VIP_CNTRL_4_BLANKIT(0) |

			VIP_CNTRL_4_BLC(0));
@@ -1306,6 +1309,7 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, 
	/* set color matrix bypass flag: */

	reg_write(priv, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP |

				MAT_CONTRL_MAT_SC(1));

	reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_CSC);



	/* set BIAS tmds value: */

	reg_write(priv, REG_ANA_GENERAL, 0x09);