linux-kernel - Re: [PATCH 5/5] sata, highbank: send extra clock cycles in SGPIO patterns

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Message-ID: <51F29A4D.6010307@gmail.com>
Date:	Fri, 26 Jul 2013 10:48:29 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Mark Langsdorf <mark.langsdorf@...xeda.com>
CC:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	tj@...nel.org, devicetree@...r.kernel.org, pawel.moll@....com,
	mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com
Subject: Re: [PATCH 5/5] sata, highbank: send extra clock cycles in SGPIO
 patterns

On 07/26/2013 10:11 AM, Mark Langsdorf wrote:
> Some SGPIO PICs don't follow the standard very well and expect a
> certain number of clock cycles or port frames in each SGPIO pattern.
> Add two optional parameters in the DTB that can provide the number of
> extra clock cycles to be sent before and after each SGPIO pattern.
> Read those parameters from the DTB and send the extra clock cycles.
> 
> Signed-off-by: Mark Langsdorf <mark.langsdorf@...xeda.com>

Acked-by: Rob Herring <rob.herring@...xeda.com>

> ---
>  Documentation/devicetree/bindings/ata/sata_highbank.txt |  4 ++++
>  drivers/ata/sata_highbank.c                             | 16 +++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
> index d692e9e..a05eb92 100644
> --- a/Documentation/devicetree/bindings/ata/sata_highbank.txt
> +++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt
> @@ -22,6 +22,10 @@ Optional properties:
>  			SGPIO bitstream.
>  - calxeda,tx-atten  : a u8 array that contains TX attenuation override
>  			codes, one per port.
> +- calxeda,pre-clocks : a u32 that indicates the number of additional clock
> +			cycles to transmit before sending an SGPIO pattern
> +- calxeda,post-clocks: a u32 that indicates the number of additional clock
> +			cycles to transmit after sending an SGPIO pattern
>  
>  Example:
>          sata@...08000 {
> diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
> index 4c8444f..0ca27fe 100644
> --- a/drivers/ata/sata_highbank.c
> +++ b/drivers/ata/sata_highbank.c
> @@ -82,9 +82,11 @@ static DEFINE_SPINLOCK(sgpio_lock);
>  #define SGPIO_PINS			3
>  #define SGPIO_PORTS			8
>  
> -/* can be cast as an ahci_host_priv for compatibility with most functions */
>  struct ecx_plat_data {
>  	u32		n_ports;
> +	/* number of extra clocks that the SGPIO PIC controller expects */
> +	u32		pre_clocks;
> +	u32		post_clocks;
>  	unsigned	sgpio_gpio[SGPIO_PINS];
>  	u32		sgpio_pattern;
>  	u32		port_to_sgpio[SGPIO_PORTS];
> @@ -144,7 +146,7 @@ static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
>  	struct ecx_plat_data *pdata = (struct ecx_plat_data *) hpriv->plat_data;
>  	struct ahci_port_priv *pp = ap->private_data;
>  	unsigned long flags;
> -	int pmp, i;
> +	int pmp, i, patt_len;
>  	struct ahci_em_priv *emp;
>  	u32 sgpio_out;
>  
> @@ -161,6 +163,9 @@ static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
>  	spin_lock_irqsave(&sgpio_lock, flags);
>  	ecx_parse_sgpio(pdata, ap->port_no, state);
>  	sgpio_out = pdata->sgpio_pattern;
> +	for (i = 0; i < pdata->pre_clocks; i++)
> +		ecx_led_cycle_clock(pdata);
> +
>  	gpio_set_value(pdata->sgpio_gpio[SLOAD], 1);
>  	ecx_led_cycle_clock(pdata);
>  	gpio_set_value(pdata->sgpio_gpio[SLOAD], 0);
> @@ -168,11 +173,14 @@ static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
>  	 * bit-bang out the SGPIO pattern, by consuming a bit and then
>  	 * clocking it out.
>  	 */
> -	for (i = 0; i < (SGPIO_SIGNALS * pdata->n_ports); i++) {
> +	patt_len = SGPIO_SIGNALS * pdata->n_ports;
> +	for (i = 0; i < patt_len; i++) {
>  		gpio_set_value(pdata->sgpio_gpio[SDATA], sgpio_out & 1);
>  		sgpio_out >>= 1;
>  		ecx_led_cycle_clock(pdata);
>  	}
> +	for (i = 0; i < pdata->post_clocks; i++)
> +		ecx_led_cycle_clock(pdata);
>  
>  	/* save off new led state for port/slot */
>  	emp->led_state = state;
> @@ -207,6 +215,8 @@ static void highbank_set_em_messages(struct device *dev,
>  	of_property_read_u32_array(np, "calxeda,led-order",
>  						pdata->port_to_sgpio,
>  						pdata->n_ports);
> +	of_property_read_u32(np, "calxeda,pre-clocks", &pdata->pre_clocks);
> +	of_property_read_u32(np, "calxeda,post-clocks", &pdata->post_clocks);
>  
>  	/* store em_loc */
>  	hpriv->em_loc = 0;
> 

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