Re: [PATCH v3 04/15] drm: bridge/dw_hdmi: add indentification registers parse and record

[yakir <ykk@rock-chips.com>]

On 02/05/2015 11:46 PM, Daniel Kurtz wrote:
> On Tue, Feb 3, 2015 at 11:11 PM, Yakir Yang <ykk@rock-chips.com> wrote:
>> By parsing the indentification registers we can know what functions
>> are present on the hdmi ip.
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>> ---
>> Changes in v3:
>> - Add ID registers parse and record
>>
>> Changes in v2: None
>>
>>   drivers/gpu/drm/bridge/dw_hdmi.c | 59 ++++++++++++++++++++++++++++++++++++++++
>>   drivers/gpu/drm/bridge/dw_hdmi.h | 23 ++++++++++++++++
>>   2 files changed, 82 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
>> index 08f10da..7b5b664 100644
>> --- a/drivers/gpu/drm/bridge/dw_hdmi.c
>> +++ b/drivers/gpu/drm/bridge/dw_hdmi.c
>> @@ -79,6 +79,23 @@ static const u16 csc_coeff_rgb_in_eitu709[3][4] = {
>>          { 0x6756, 0x78ab, 0x2000, 0x0200 }
>>   };
>>
>> +struct hdmi_id {
>> +       u8 design;
>> +       u8 revision;
>> +
>> +       bool prepen;
>> +       bool audspdif;
>> +       bool audi2s;
>> +       bool hdmi14;
>> +       bool csc;
>> +       bool hdcp;
>> +       bool hdmi20;
>> +       bool confapb;
>> +       bool ahbauddma;
>> +       bool gpaud;
>> +       u8 phy_type;
>> +};
>> +
>>   struct hdmi_vmode {
>>          bool mdvi;
>>          bool mhsyncpolarity;
>> @@ -111,6 +128,8 @@ struct dw_hdmi {
>>          struct clk *isfr_clk;
>>          struct clk *iahb_clk;
>>
>> +       struct hdmi_id id;
>> +
>>          struct hdmi_data_info hdmi_data;
>>          const struct dw_hdmi_plat_data *plat_data;
>>
>> @@ -1259,6 +1278,36 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>>          return 0;
>>   }
>>
>> +static void hdmi_parse_id(struct dw_hdmi *hdmi)
>> +{
>> +       u8 config0_id, config1_id, config2_id, config3_id;
>> +
>> +       config0_id = hdmi_readb(hdmi, HDMI_CONFIG0_ID);
>> +       config1_id = hdmi_readb(hdmi, HDMI_CONFIG1_ID);
>> +       config2_id = hdmi_readb(hdmi, HDMI_CONFIG2_ID);
>> +       config3_id = hdmi_readb(hdmi, HDMI_CONFIG3_ID);
>> +
>> +       hdmi->id.prepen = config0_id & HDMI_CONFIG0_ID_PREPEN ? true : false;
> These could all be "!!(A & B)", but perhaps that is just a matter of
> personal preference.
Okay, "!!(A & B)" looks good, I will modify it.

Thanks.  : )
>> +       hdmi->id.audi2s = config0_id & HDMI_CONFIG0_ID_AUDI2S ? true : false;
>> +       hdmi->id.hdmi14 = config0_id & HDMI_CONFIG0_ID_HDMI14 ? true : false;
>> +       hdmi->id.hdcp = config0_id & HDMI_CONFIG0_ID_HDCP ? true : false;
>> +       hdmi->id.csc = config0_id & HDMI_CONFIG0_ID_CSC ? true : false;
>> +       hdmi->id.audspdif = config0_id & HDMI_CONFIG0_ID_AUDSPDIF ?
>> +                           true : false;
>> +
>> +       hdmi->id.confapb = config1_id & HDMI_CONFIG1_ID_CONFAPB ? true : false;
>> +       hdmi->id.hdmi20 = config1_id & HDMI_CONFIG1_ID_HDMI20 ? true : false;
>> +
>> +       hdmi->id.phy_type = config2_id & HDMI_CONFIG2_ID;
> HDMI_CONFIG2_ID is a register offset, not a mask.

Thanks, I will correct it.

>> +
>> +       hdmi->id.gpaud = config3_id & HDMI_CONFIG3_ID_GPAUD ? true : false;
>> +       hdmi->id.ahbauddma = config3_id & HDMI_CONFIG3_ID_AHBAUDDMA ?
>> +                            true : false;
>> +
>> +       hdmi->id.design = hdmi_readb(hdmi, HDMI_DESIGN_ID);
>> +       hdmi->id.revision = hdmi_readb(hdmi, HDMI_REVISION_ID);
>> +}
>> +
>>   /* Wait until we are registered to enable interrupts */
>>   static int dw_hdmi_fb_registered(struct dw_hdmi *hdmi)
>>   {
>> @@ -1670,6 +1719,16 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
>>                   hdmi_readb(hdmi, HDMI_PRODUCT_ID0),
>>                   hdmi_readb(hdmi, HDMI_PRODUCT_ID1));
>>
>> +       /* Config IDs */
>> +       dev_info(dev,
>> +                "Detected HDMI config_id 0x%x:0x%x:0x%x:0x%x\n",
>> +                hdmi_readb(hdmi, HDMI_CONFIG0_ID),
>> +                hdmi_readb(hdmi, HDMI_CONFIG1_ID),
>> +                hdmi_readb(hdmi, HDMI_CONFIG2_ID),
>> +                hdmi_readb(hdmi, HDMI_CONFIG3_ID));
>> +
>> +       hdmi_parse_id(hdmi);
> It seems a bit silly to read the regs once to print them, and then
> again in hdmi_parse_id().
> Perhaps move the dev_info() inside hdmi_parse_id().
> It would also be nice to print a full summary of all of the parsed fields.
Okay, I will warp them into hdmi_parse_id().

Thanks.  : )

>> +
>>          initialize_hdmi_ih_mutes(hdmi);
>>
>>          ret = devm_request_threaded_irq(dev, irq, dw_hdmi_hardirq,
>> diff --git a/drivers/gpu/drm/bridge/dw_hdmi.h b/drivers/gpu/drm/bridge/dw_hdmi.h
>> index 175dbc8..e4ba634 100644
>> --- a/drivers/gpu/drm/bridge/dw_hdmi.h
>> +++ b/drivers/gpu/drm/bridge/dw_hdmi.h
>> @@ -545,6 +545,29 @@
>>   #define HDMI_I2CM_FS_SCL_LCNT_0_ADDR            0x7E12
>>
>>   enum {
>> +/* HDMI_CONFIG0_ID */
>> +       HDMI_CONFIG0_ID_PREPEN = 0x80,
>> +       HDMI_CONFIG0_ID_AUDSPDIF = 0x20,
>> +       HDMI_CONFIG0_ID_AUDI2S = 0x10,
>> +       HDMI_CONFIG0_ID_HDMI14 = 0x08,
>> +       HDMI_CONFIG0_ID_CSC = 0x04,
>> +       HDMI_CONFIG0_ID_HDCP = 0x01,
>> +
>> +/* HDMI_CONFIG1_ID */
>> +       HDMI_CONFIG1_ID_HDMI20 = 0x20,
>> +       HDMI_CONFIG1_ID_CONFAPB = 0x02,
>> +
>> +/* HDMI_CONFIG2_ID */
>> +       HDMI_CONFIG2_ID_PHY_GEN2 = 0xf2,
>> +       HDMI_CONFIG2_ID_PHY_GEN2_HECA = 0xe2,
>> +       HDMI_CONFIG2_ID_PHY_HDMI_MHL = 0xc2,
>> +       HDMI_CONFIG2_ID_PHY_HDMI_MHL_HECA = 0xb2,
>> +       HDMI_CONFIG2_ID_LEGACY_PHY = 0x00,
>> +
>> +/* HDMI_CONFIG3_ID */
>> +       HDMI_CONFIG3_ID_AHBAUDDMA = 0x02,
>> +       HDMI_CONFIG3_ID_GPAUD = 0x01,
>> +
>>   /* IH_FC_INT2 field values */
>>          HDMI_IH_FC_INT2_OVERFLOW_MASK = 0x03,
>>          HDMI_IH_FC_INT2_LOW_PRIORITY_OVERFLOW = 0x02,
>> --
>> 2.1.2
>>
>>
>
>