RE: [PATCH 1/7] drm: adv7511: Add struct adv7511_chip_info and use i2c_get_match_data()

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Hi Laurent Pinchart,

Thanks for the feedback.

> Subject: Re: [PATCH 1/7] drm: adv7511: Add struct adv7511_chip_info and use
> i2c_get_match_data()
> 
> Hi Biju,
> 
> Thank you for the patch.
> 
> On Sun, Aug 13, 2023 at 07:05:06PM +0100, Biju Das wrote:
> > Add struct adv7511_chip_info to handle hw differences between various
> > chips rather checking against the 'type' variable in various places.
> > Replace 'adv->type'->'info->type' by moving variable 'type' from
> > struct adv7511 to struct adv7511_chip_info.
> >
> > Replace of_device_get_match_data() and ID lookup for retrieving match
> > data with i2c_get_match_data() by adding adv7511_chip_info as device
> > data for both OF and ID tables.
> 
> As commented in similar patches, please try to explain in the commit
> message the reason *why* the change is good and/or needed. It's quite
> straightforward for me to understand the change to i2c_get_match_data()
> given the discussions we've had recently, but it would be more difficult
> without that background information.

Ok will add the info. Basically it simplifies the probe() by
replacing of_device_get_match_data() and ID lookup for retrieving 
Match data.


> 
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/bridge/adv7511/adv7511.h     |  6 +-
> >  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 68 +++++++++++---------
> >  drivers/gpu/drm/bridge/adv7511/adv7533.c     |  4 +-
> >  3 files changed, 46 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h
> > b/drivers/gpu/drm/bridge/adv7511/adv7511.h
> > index 17445800248d..59e8ef10d72e 100644
> > --- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
> > +++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
> > @@ -333,6 +333,10 @@ enum adv7511_type {
> >
> >  #define ADV7511_MAX_ADDRS 3
> >
> > +struct adv7511_chip_info {
> > +	enum adv7511_type type;
> > +};
> > +
> >  struct adv7511 {
> >  	struct i2c_client *i2c_main;
> >  	struct i2c_client *i2c_edid;
> > @@ -377,7 +381,7 @@ struct adv7511 {
> >  	u8 num_dsi_lanes;
> >  	bool use_timing_gen;
> >
> > -	enum adv7511_type type;
> > +	const struct adv7511_chip_info *info;
> >  	struct platform_device *audio_pdev;
> >
> >  	struct cec_adapter *cec_adap;
> > diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > index 2611afd2c1c1..013d8d640ef4 100644
> > --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> > @@ -354,7 +354,7 @@ static void __adv7511_power_on(struct adv7511
> *adv7511)
> >  	 * first few seconds after enabling the output. On the other hand
> >  	 * adv7535 require to enable HPD Override bit for proper HPD.
> >  	 */
> > -	if (adv7511->type == ADV7535)
> > +	if (adv7511->info->type == ADV7535)
> >  		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
> >  				   ADV7535_REG_POWER2_HPD_OVERRIDE,
> >  				   ADV7535_REG_POWER2_HPD_OVERRIDE); @@ -373,7
> +373,7 @@ static
> > void adv7511_power_on(struct adv7511 *adv7511)
> >  	 */
> >  	regcache_sync(adv7511->regmap);
> >
> > -	if (adv7511->type == ADV7533 || adv7511->type == ADV7535)
> > +	if (adv7511->info->type == ADV7533 || adv7511->info->type ==
> > +ADV7535)
> >  		adv7533_dsi_power_on(adv7511);
> >  	adv7511->powered = true;
> >  }
> > @@ -381,7 +381,7 @@ static void adv7511_power_on(struct adv7511
> > *adv7511)  static void __adv7511_power_off(struct adv7511 *adv7511)  {
> >  	/* TODO: setup additional power down modes */
> > -	if (adv7511->type == ADV7535)
> > +	if (adv7511->info->type == ADV7535)
> >  		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
> >  				   ADV7535_REG_POWER2_HPD_OVERRIDE, 0);
> >
> > @@ -397,7 +397,7 @@ static void __adv7511_power_off(struct adv7511
> > *adv7511)  static void adv7511_power_off(struct adv7511 *adv7511)  {
> >  	__adv7511_power_off(adv7511);
> > -	if (adv7511->type == ADV7533 || adv7511->type == ADV7535)
> > +	if (adv7511->info->type == ADV7533 || adv7511->info->type ==
> > +ADV7535)
> >  		adv7533_dsi_power_off(adv7511);
> >  	adv7511->powered = false;
> >  }
> > @@ -682,7 +682,7 @@ adv7511_detect(struct adv7511 *adv7511, struct
> drm_connector *connector)
> >  			status = connector_status_disconnected;
> >  	} else {
> >  		/* Renable HPD sensing */
> > -		if (adv7511->type == ADV7535)
> > +		if (adv7511->info->type == ADV7535)
> >  			regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
> >  					   ADV7535_REG_POWER2_HPD_OVERRIDE,
> >  					   ADV7535_REG_POWER2_HPD_OVERRIDE); @@ -
> 786,7 +786,7 @@ static
> > void adv7511_mode_set(struct adv7511 *adv7511,
> >  	else
> >  		low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
> >
> > -	if (adv7511->type == ADV7511)
> > +	if (adv7511->info->type == ADV7511)
> >  		regmap_update_bits(adv7511->regmap, 0xfb,
> >  				   0x6, low_refresh_rate << 1);
> >  	else
> > @@ -921,7 +921,7 @@ static enum drm_mode_status
> > adv7511_bridge_mode_valid(struct drm_bridge *bridge,  {
> >  	struct adv7511 *adv = bridge_to_adv7511(bridge);
> >
> > -	if (adv->type == ADV7533 || adv->type == ADV7535)
> > +	if (adv->info->type == ADV7533 || adv->info->type == ADV7535)
> >  		return adv7533_mode_valid(adv, mode);
> >  	else
> >  		return adv7511_mode_valid(adv, mode); @@ -1009,7 +1009,7 @@
> static
> > int adv7511_init_regulators(struct adv7511 *adv)
> >  	unsigned int i;
> >  	int ret;
> >
> > -	if (adv->type == ADV7511) {
> > +	if (adv->info->type == ADV7511) {
> >  		supply_names = adv7511_supply_names;
> >  		adv->num_supplies = ARRAY_SIZE(adv7511_supply_names);
> >  	} else {
> > @@ -1093,7 +1093,7 @@ static int adv7511_init_cec_regmap(struct adv7511
> *adv)
> >  		goto err;
> >  	}
> >
> > -	if (adv->type == ADV7533 || adv->type == ADV7535) {
> > +	if (adv->info->type == ADV7533 || adv->info->type == ADV7535) {
> >  		ret = adv7533_patch_cec_registers(adv);
> >  		if (ret)
> >  			goto err;
> > @@ -1192,7 +1192,7 @@ static int adv7511_parse_dt(struct device_node
> > *np,
> >
> >  static int adv7511_probe(struct i2c_client *i2c)  {
> > -	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
> > +	static const struct adv7511_chip_info *info;
> >  	struct adv7511_link_config link_config;
> >  	struct adv7511 *adv7511;
> >  	struct device *dev = &i2c->dev;
> > @@ -1206,18 +1206,16 @@ static int adv7511_probe(struct i2c_client *i2c)
> >  	if (!adv7511)
> >  		return -ENOMEM;
> >
> > +	info = i2c_get_match_data(i2c);
> > +
> >  	adv7511->i2c_main = i2c;
> >  	adv7511->powered = false;
> >  	adv7511->status = connector_status_disconnected;
> > -
> > -	if (dev->of_node)
> > -		adv7511->type = (enum
> adv7511_type)of_device_get_match_data(dev);
> > -	else
> > -		adv7511->type = id->driver_data;
> > +	adv7511->info = info;
> 
> You can drop the local info variable and write
OK.

> 
> 	adv7511->info = i2c_get_match_data(i2c);
> 
> >
> >  	memset(&link_config, 0, sizeof(link_config));
> >
> > -	if (adv7511->type == ADV7511)
> > +	if (adv7511->info->type == ADV7511)
> >  		ret = adv7511_parse_dt(dev->of_node, &link_config);
> >  	else
> >  		ret = adv7533_parse_dt(dev->of_node, adv7511); @@ -1254,7
> +1252,7
> > @@ static int adv7511_probe(struct i2c_client *i2c)
> >  		goto uninit_regulators;
> >  	dev_dbg(dev, "Rev. %d\n", val);
> >
> > -	if (adv7511->type == ADV7511)
> > +	if (info->type == ADV7511)
> 
> And use adv7511->info->type here and below, the same way you use it above.

OK.

Cheers,
Biju
> 
> With this addressed,
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> 
> >  		ret = regmap_register_patch(adv7511->regmap,
> >  					    adv7511_fixed_registers,
> >  					    ARRAY_SIZE(adv7511_fixed_registers));
> > @@ -1306,7 +1304,7 @@ static int adv7511_probe(struct i2c_client *i2c)
> >
> >  	i2c_set_clientdata(i2c, adv7511);
> >
> > -	if (adv7511->type == ADV7511)
> > +	if (info->type == ADV7511)
> >  		adv7511_set_link_config(adv7511, &link_config);
> >
> >  	ret = adv7511_cec_init(dev, adv7511); @@ -1325,7 +1323,7 @@ static
> > int adv7511_probe(struct i2c_client *i2c)
> >
> >  	adv7511_audio_init(dev, adv7511);
> >
> > -	if (adv7511->type == ADV7533 || adv7511->type == ADV7535) {
> > +	if (info->type == ADV7533 || info->type == ADV7535) {
> >  		ret = adv7533_attach_dsi(adv7511);
> >  		if (ret)
> >  			goto err_unregister_audio;
> > @@ -1368,22 +1366,34 @@ static void adv7511_remove(struct i2c_client
> *i2c)
> >  	i2c_unregister_device(adv7511->i2c_edid);
> >  }
> >
> > +static const struct adv7511_chip_info adv7511_chip_info = {
> > +	.type = ADV7511
> > +};
> > +
> > +static const struct adv7511_chip_info adv7533_chip_info = {
> > +	.type = ADV7533
> > +};
> > +
> > +static const struct adv7511_chip_info adv7535_chip_info = {
> > +	.type = ADV7535
> > +};
> > +
> >  static const struct i2c_device_id adv7511_i2c_ids[] = {
> > -	{ "adv7511", ADV7511 },
> > -	{ "adv7511w", ADV7511 },
> > -	{ "adv7513", ADV7511 },
> > -	{ "adv7533", ADV7533 },
> > -	{ "adv7535", ADV7535 },
> > +	{ "adv7511", (kernel_ulong_t)&adv7511_chip_info },
> > +	{ "adv7511w", (kernel_ulong_t)&adv7511_chip_info },
> > +	{ "adv7513", (kernel_ulong_t)&adv7511_chip_info },
> > +	{ "adv7533", (kernel_ulong_t)&adv7533_chip_info },
> > +	{ "adv7535", (kernel_ulong_t)&adv7535_chip_info },
> >  	{ }
> >  };
> >  MODULE_DEVICE_TABLE(i2c, adv7511_i2c_ids);
> >
> >  static const struct of_device_id adv7511_of_ids[] = {
> > -	{ .compatible = "adi,adv7511", .data = (void *)ADV7511 },
> > -	{ .compatible = "adi,adv7511w", .data = (void *)ADV7511 },
> > -	{ .compatible = "adi,adv7513", .data = (void *)ADV7511 },
> > -	{ .compatible = "adi,adv7533", .data = (void *)ADV7533 },
> > -	{ .compatible = "adi,adv7535", .data = (void *)ADV7535 },
> > +	{ .compatible = "adi,adv7511", .data = &adv7511_chip_info },
> > +	{ .compatible = "adi,adv7511w", .data = &adv7511_chip_info },
> > +	{ .compatible = "adi,adv7513", .data = &adv7511_chip_info },
> > +	{ .compatible = "adi,adv7533", .data = &adv7533_chip_info },
> > +	{ .compatible = "adi,adv7535", .data = &adv7535_chip_info },
> >  	{ }
> >  };
> >  MODULE_DEVICE_TABLE(of, adv7511_of_ids); diff --git
> > a/drivers/gpu/drm/bridge/adv7511/adv7533.c
> > b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> > index 7e3e56441aed..c452c4dc1c3f 100644
> > --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
> > +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> > @@ -108,11 +108,11 @@ enum drm_mode_status adv7533_mode_valid(struct
> adv7511 *adv,
> >  	u8 bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
> >
> >  	/* Check max clock for either 7533 or 7535 */
> > -	if (mode->clock > (adv->type == ADV7533 ? 80000 : 148500))
> > +	if (mode->clock > (adv->info->type == ADV7533 ? 80000 : 148500))
> >  		return MODE_CLOCK_HIGH;
> >
> >  	/* Check max clock for each lane */
> > -	max_lane_freq = (adv->type == ADV7533 ? 800000 : 891000);
> > +	max_lane_freq = (adv->info->type == ADV7533 ? 800000 : 891000);
> >
> >  	if (mode->clock * bpp > max_lane_freq * adv->num_dsi_lanes)
> >  		return MODE_CLOCK_HIGH;
> 
> --
> Regards,
> 
> Laurent Pinchart




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