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

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
......@@ -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);
......
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