All of lore.kernel.org
 help / color / mirror / Atom feed
From: Sam Ravnborg <sam@ravnborg.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: emil.l.velikov@gmail.com, dri-devel@lists.freedesktop.org,
	kraxel@redhat.com, airlied@redhat.com
Subject: Re: [PATCH 01/13] drm/ast: Move I2C code within ast_mode.c
Date: Tue, 28 Jul 2020 20:04:58 +0200	[thread overview]
Message-ID: <20200728180458.GC1114934@ravnborg.org> (raw)
In-Reply-To: <20200728074425.2749-2-tzimmermann@suse.de>

Hi Thomas.

A few comments related to the code - but not to this patch and
not to this patch-set.
But I noticed so here goes.

	Sam

On Tue, Jul 28, 2020 at 09:44:13AM +0200, Thomas Zimmermann wrote:
> The I2C support feels slammed down to the end of ast_mode.c. Improve
> this by moving the code before it's callers, remove the declarations,
> rename the callbacks to match I2C's get/set sda/scl convention, and
> prefix all functions with ast_. No functional changes have been made.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/ast/ast_mode.c | 249 +++++++++++++++++----------------
>  1 file changed, 125 insertions(+), 124 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> index 154cd877d9d1..19f1dfc8e9e0 100644
> --- a/drivers/gpu/drm/ast/ast_mode.c
> +++ b/drivers/gpu/drm/ast/ast_mode.c
> @@ -46,9 +46,6 @@
>  #include "ast_drv.h"
>  #include "ast_tables.h"
>  
> -static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev);
> -static void ast_i2c_destroy(struct ast_i2c_chan *i2c);
> -
>  static inline void ast_load_palette_index(struct ast_private *ast,
>  				     u8 index, u8 red, u8 green,
>  				     u8 blue)
> @@ -514,6 +511,131 @@ static void ast_set_start_address_crt1(struct ast_private *ast,
>  
>  }
>  
> +/*
> + * I2C
> + */
> +
> +static int ast_i2c_getscl(void *i2c_priv)
> +{
> +	struct ast_i2c_chan *i2c = i2c_priv;
> +	struct ast_private *ast = to_ast_private(i2c->dev);
> +	uint32_t val, val2, count, pass;
s/uint32_t/u32

> +
> +	count = 0;
> +	pass = 0;
> +	val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
So val is a bool - but anyway an int is used.

> +	do {
> +		val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
Likewise for val2.

> +		if (val == val2) {
> +			pass++;
> +		} else {
> +			pass = 0;
> +			val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
> +		}
> +	} while ((pass < 5) && (count++ < 0x10000));
> +
> +	return val & 1 ? 1 : 0;
bool to int conversion could do the trick here.

> +}
> +
> +static int ast_i2c_getsda(void *i2c_priv)
> +{
> +	struct ast_i2c_chan *i2c = i2c_priv;
> +	struct ast_private *ast = to_ast_private(i2c->dev);
> +	uint32_t val, val2, count, pass;
> +
> +	count = 0;
> +	pass = 0;
> +	val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> +	do {
> +		val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> +		if (val == val2) {
> +			pass++;
> +		} else {
> +			pass = 0;
> +			val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> +		}
> +	} while ((pass < 5) && (count++ < 0x10000));
> +
> +	return val & 1 ? 1 : 0;
> +}
> +
> +static void ast_i2c_setscl(void *i2c_priv, int clock)
> +{
> +	struct ast_i2c_chan *i2c = i2c_priv;
> +	struct ast_private *ast = to_ast_private(i2c->dev);
> +	int i;
> +	u8 ujcrb7, jtemp;
And now u8 is used for registers.
Maybe because ast_get_index_reg_mask() returns uint8_t.

So for consistentcy do the uint8_t => u8 etc. conversion first.

> +
> +	for (i = 0; i < 0x10000; i++) {
> +		ujcrb7 = ((clock & 0x01) ? 0 : 1);
> +		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7);
> +		jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01);
> +		if (ujcrb7 == jtemp)
> +			break;
> +	}
> +}
> +
> +static void ast_i2c_setsda(void *i2c_priv, int data)
> +{
> +	struct ast_i2c_chan *i2c = i2c_priv;
> +	struct ast_private *ast = to_ast_private(i2c->dev);
> +	int i;
> +	u8 ujcrb7, jtemp;
> +
> +	for (i = 0; i < 0x10000; i++) {
> +		ujcrb7 = ((data & 0x01) ? 0 : 1) << 2;
> +		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7);
> +		jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04);
> +		if (ujcrb7 == jtemp)
> +			break;
> +	}
> +}
> +
> +static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev)
> +{
> +	struct ast_i2c_chan *i2c;
> +	int ret;
> +
> +	i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL);
> +	if (!i2c)
> +		return NULL;
> +
> +	i2c->adapter.owner = THIS_MODULE;
> +	i2c->adapter.class = I2C_CLASS_DDC;
> +	i2c->adapter.dev.parent = &dev->pdev->dev;
> +	i2c->dev = dev;
> +	i2c_set_adapdata(&i2c->adapter, i2c);
If ast_private * was passed here and not i2c.
Then the implementation of ast_i2c_* could be a tad simpler - no
upclassing needed.
And then you could drop the drm_device field.
(And would need to invent another way to check if i2c is initialized).


> +	snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
> +		 "AST i2c bit bus");
> +	i2c->adapter.algo_data = &i2c->bit;
> +
> +	i2c->bit.udelay = 20;
> +	i2c->bit.timeout = 2;
> +	i2c->bit.data = i2c;
> +	i2c->bit.setsda = ast_i2c_setsda;
> +	i2c->bit.setscl = ast_i2c_setscl;
> +	i2c->bit.getsda = ast_i2c_getsda;
> +	i2c->bit.getscl = ast_i2c_getscl;
> +	ret = i2c_bit_add_bus(&i2c->adapter);
> +	if (ret) {
> +		drm_err(dev, "Failed to register bit i2c\n");
> +		goto out_free;
> +	}
> +
> +	return i2c;
> +out_free:
> +	kfree(i2c);
> +	return NULL;
> +}
> +
> +static void ast_i2c_destroy(struct ast_i2c_chan *i2c)
> +{
> +	if (!i2c)
> +		return;
> +	i2c_del_adapter(&i2c->adapter);
> +	kfree(i2c);
> +}
> +
>  /*
>   * Primary plane
>   */
> @@ -1146,124 +1268,3 @@ int ast_mode_config_init(struct ast_private *ast)
>  
>  	return 0;
>  }
> -
> -static int get_clock(void *i2c_priv)
> -{
> -	struct ast_i2c_chan *i2c = i2c_priv;
> -	struct ast_private *ast = to_ast_private(i2c->dev);
> -	uint32_t val, val2, count, pass;
> -
> -	count = 0;
> -	pass = 0;
> -	val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
> -	do {
> -		val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
> -		if (val == val2) {
> -			pass++;
> -		} else {
> -			pass = 0;
> -			val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
> -		}
> -	} while ((pass < 5) && (count++ < 0x10000));
> -
> -	return val & 1 ? 1 : 0;
> -}
> -
> -static int get_data(void *i2c_priv)
> -{
> -	struct ast_i2c_chan *i2c = i2c_priv;
> -	struct ast_private *ast = to_ast_private(i2c->dev);
> -	uint32_t val, val2, count, pass;
> -
> -	count = 0;
> -	pass = 0;
> -	val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> -	do {
> -		val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> -		if (val == val2) {
> -			pass++;
> -		} else {
> -			pass = 0;
> -			val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
> -		}
> -	} while ((pass < 5) && (count++ < 0x10000));
> -
> -	return val & 1 ? 1 : 0;
> -}
> -
> -static void set_clock(void *i2c_priv, int clock)
> -{
> -	struct ast_i2c_chan *i2c = i2c_priv;
> -	struct ast_private *ast = to_ast_private(i2c->dev);
> -	int i;
> -	u8 ujcrb7, jtemp;
> -
> -	for (i = 0; i < 0x10000; i++) {
> -		ujcrb7 = ((clock & 0x01) ? 0 : 1);
> -		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7);
> -		jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01);
> -		if (ujcrb7 == jtemp)
> -			break;
> -	}
> -}
> -
> -static void set_data(void *i2c_priv, int data)
> -{
> -	struct ast_i2c_chan *i2c = i2c_priv;
> -	struct ast_private *ast = to_ast_private(i2c->dev);
> -	int i;
> -	u8 ujcrb7, jtemp;
> -
> -	for (i = 0; i < 0x10000; i++) {
> -		ujcrb7 = ((data & 0x01) ? 0 : 1) << 2;
> -		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7);
> -		jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04);
> -		if (ujcrb7 == jtemp)
> -			break;
> -	}
> -}
> -
> -static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev)
> -{
> -	struct ast_i2c_chan *i2c;
> -	int ret;
> -
> -	i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL);
> -	if (!i2c)
> -		return NULL;
> -
> -	i2c->adapter.owner = THIS_MODULE;
> -	i2c->adapter.class = I2C_CLASS_DDC;
> -	i2c->adapter.dev.parent = &dev->pdev->dev;
> -	i2c->dev = dev;
> -	i2c_set_adapdata(&i2c->adapter, i2c);
> -	snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
> -		 "AST i2c bit bus");
> -	i2c->adapter.algo_data = &i2c->bit;
> -
> -	i2c->bit.udelay = 20;
> -	i2c->bit.timeout = 2;
> -	i2c->bit.data = i2c;
> -	i2c->bit.setsda = set_data;
> -	i2c->bit.setscl = set_clock;
> -	i2c->bit.getsda = get_data;
> -	i2c->bit.getscl = get_clock;
> -	ret = i2c_bit_add_bus(&i2c->adapter);
> -	if (ret) {
> -		drm_err(dev, "Failed to register bit i2c\n");
> -		goto out_free;
> -	}
> -
> -	return i2c;
> -out_free:
> -	kfree(i2c);
> -	return NULL;
> -}
> -
> -static void ast_i2c_destroy(struct ast_i2c_chan *i2c)
> -{
> -	if (!i2c)
> -		return;
> -	i2c_del_adapter(&i2c->adapter);
> -	kfree(i2c);
> -}
> -- 
> 2.27.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2020-07-28 18:05 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28  7:44 [PATCH 00/13] drm/ast: Convert to managed initialization Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 01/13] drm/ast: Move I2C code within ast_mode.c Thomas Zimmermann
2020-07-28 18:04   ` Sam Ravnborg [this message]
2020-07-30  9:18     ` Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 02/13] drm/ast: Test if I2C support has been initialized Thomas Zimmermann
2020-07-28 17:38   ` Sam Ravnborg
2020-07-28  7:44 ` [PATCH 03/13] drm/ast: Embed I2C fields in struct ast_connector Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 04/13] drm/ast: Managed release of I2C adapter Thomas Zimmermann
2020-07-28  9:23   ` daniel
2020-07-28  9:33     ` Thomas Zimmermann
2020-07-30  9:19     ` Thomas Zimmermann
2020-07-28 18:06   ` Sam Ravnborg
2020-07-30  9:23     ` Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 05/13] drm/ast: Embed CRTC and connector in struct ast_private Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 06/13] drm/ast: Separate DRM driver from PCI code Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 07/13] drm/ast: Replace driver load/unload functions with device create/destroy Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 08/13] drm/ast: Replace struct_drm_device.dev_private with to_ast_private() Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 09/13] drm/ast: Don't use ast->dev if dev is available Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 10/13] drm/ast: Embed struct drm_device in struct ast_private Thomas Zimmermann
2020-07-28  7:44 ` [PATCH 11/13] drm/ast: Managed release of ast firmware Thomas Zimmermann
2020-07-28  9:17   ` daniel
2020-07-28  9:32     ` Thomas Zimmermann
2020-07-28  9:34       ` daniel
2020-07-28  7:44 ` [PATCH 12/13] drm/ast: Manage release of firmware backup memory Thomas Zimmermann
2020-07-28  9:18   ` daniel
2020-07-28  7:44 ` [PATCH 13/13] drm/ast: Managed device release Thomas Zimmermann
2020-07-28 18:10 ` [PATCH 00/13] drm/ast: Convert to managed initialization Sam Ravnborg

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200728180458.GC1114934@ravnborg.org \
    --to=sam@ravnborg.org \
    --cc=airlied@redhat.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=emil.l.velikov@gmail.com \
    --cc=kraxel@redhat.com \
    --cc=tzimmermann@suse.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.