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drm/i2c: tda998x: don't read write-only registers 

This patch takes care of the write-only registers of the tda998x.

The registers SOFTRESET, TBG_CNTRL_0 and TBG_CNTRL_1 have all bits
cleared after reset, so, they may be fully re-written.

The register MAT_CONTRL is set to
	MAT_CONTRL_MAT_BP | MAT_CONTRL_MAT_SC(1)
after reset, so, it may be fully set again to this value.

Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jean-Francois Moine 2014-01-25 18:14:42 +01:00 committed by Russell King
parent 73d5e253ac
commit 81b53a166f
1 changed files with 24 additions and 22 deletions
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46
drivers/gpu/drm/i2c/tda998x_drv.c
View File

@ -496,9 +496,9 @@ static void
tda998x_reset(struct tda998x_priv *priv)
{
/* reset audio and i2c master: */
reg_set(priv, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER);
reg_write(priv, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER);
msleep(50);
reg_clear(priv, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER);
reg_write(priv, REG_SOFTRESET, 0);
msleep(50);
/* reset transmitter: */
@ -860,7 +860,7 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
/* set HDMI HDCP mode off: */
reg_set(priv, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS);
reg_write(priv, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS);
reg_clear(priv, REG_TX33, TX33_HDMI);
reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(0));
@ -887,38 +887,28 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
PLL_SERIAL_2_SRL_PR(rep));
/* set color matrix bypass flag: */
reg_set(priv, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP);
reg_write(priv, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP |
MAT_CONTRL_MAT_SC(1));
/* set BIAS tmds value: */
reg_write(priv, REG_ANA_GENERAL, 0x09);
reg_clear(priv, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_MTHD);
reg_write(priv, REG_TBG_CNTRL_0, 0);
/*
* Sync on rising HSYNC/VSYNC
*/
reg_write(priv, REG_VIP_CNTRL_3, 0);
reg_set(priv, REG_VIP_CNTRL_3, VIP_CNTRL_3_SYNC_HS);
reg = VIP_CNTRL_3_SYNC_HS;
/*
* TDA19988 requires high-active sync at input stage,
* so invert low-active sync provided by master encoder here
*/
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
reg_set(priv, REG_VIP_CNTRL_3, VIP_CNTRL_3_H_TGL);
reg |= VIP_CNTRL_3_H_TGL;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
reg_set(priv, REG_VIP_CNTRL_3, VIP_CNTRL_3_V_TGL);
/*
* Always generate sync polarity relative to input sync and
* revert input stage toggled sync at output stage
*/
reg = TBG_CNTRL_1_TGL_EN;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
reg |= TBG_CNTRL_1_H_TGL;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
reg |= TBG_CNTRL_1_V_TGL;
reg_write(priv, REG_TBG_CNTRL_1, reg);
reg |= VIP_CNTRL_3_V_TGL;
reg_write(priv, REG_VIP_CNTRL_3, reg);
reg_write(priv, REG_VIDFORMAT, 0x00);
reg_write16(priv, REG_REFPIX_MSB, ref_pix);
@ -947,13 +937,25 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
reg_write(priv, REG_ENABLE_SPACE, 0x00);
}
/*
* Always generate sync polarity relative to input sync and
* revert input stage toggled sync at output stage
*/
reg = TBG_CNTRL_1_DWIN_DIS | TBG_CNTRL_1_TGL_EN;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
reg |= TBG_CNTRL_1_H_TGL;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
reg |= TBG_CNTRL_1_V_TGL;
reg_write(priv, REG_TBG_CNTRL_1, reg);
/* must be last register set: */
reg_clear(priv, REG_TBG_CNTRL_0, TBG_CNTRL_0_SYNC_ONCE);
reg_write(priv, REG_TBG_CNTRL_0, 0);
/* Only setup the info frames if the sink is HDMI */
if (priv->is_hdmi_sink) {
/* We need to turn HDMI HDCP stuff on to get audio through */
reg_clear(priv, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS);
reg &= ~TBG_CNTRL_1_DWIN_DIS;
reg_write(priv, REG_TBG_CNTRL_1, reg);
reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(1));
reg_set(priv, REG_TX33, TX33_HDMI);