Re: [PATCH 15/20] staging/wilc1000: pass hif operations through initialization

[glen lee]

On 2015ë 11ì 12ì 20:39, Arnd Bergmann wrote:
> On Thursday 12 November 2015 19:05:41 glen lee wrote:
> > Hi arnd,
> >
> > I appreciate the patches.
> > I did test this patch series on h/w which is arm based MCU.
> >   From this patch wilc is not working properly. After downloading firmware, the firmware cannot start and it fails.
> > I double check this patch and the previous one(14/20) which works fine.
> > I cannot find the problem in this patch at the moment. I will see if I can find something,
> > and I'd appreciate if you would help with it.
> I've looked at it some more, but didn't find anything obvious, here are some
> possible things I found:
>
>
> > > -struct wilc_hif_func wilc_hif_sdio = {
> > > -	sdio_init,
> > > -	sdio_deinit,
> > > -	sdio_read_reg,
> > > -	sdio_write_reg,
> > > -	sdio_read,
> > > -	sdio_write,
> > > -	sdio_sync,
> > > -	sdio_clear_int,
> > > -	sdio_read_int,
> > > -	sdio_clear_int_ext,
> > > -	sdio_read_size,
> > > -	sdio_write,
> > > -	sdio_read,
> > > -	sdio_sync_ext,
> > > -
> > > -	sdio_set_max_speed,
> > > -	sdio_set_default_speed,
> > > +const struct wilc_hif_func wilc_hif_sdio = {
> > > +	.hif_init = sdio_init,
> > > +	.hif_deinit = sdio_deinit,
> > > +	.hif_read_reg = sdio_read_reg,
> > > +	.hif_write_reg = sdio_write_reg,
> > > +	.hif_block_rx = sdio_read,
> > > +	.hif_block_tx = sdio_write,
> > > +	.hif_sync = sdio_sync,
> > > +	.hif_clear_int = sdio_clear_int,
> > > +	.hif_read_int = sdio_read_int,
> > > +	.hif_clear_int_ext = sdio_clear_int_ext,
> > > +	.hif_read_size = sdio_read_size,
> > > +	.hif_block_rx_ext = sdio_write,
> > > +	.hif_block_tx_ext = sdio_read,

Hi arnd,

I found this. These should be like this. It works fine.
+	.hif_block_tx_ext = sdio_write,
+	.hif_block_rx_ext = sdio_read,

also, wilc_hif_spi need to be fixed together like this.
+	.hif_block_tx_ext = _wilc_spi_write,
+	.hif_block_rx_ext = _wilc_spi_read,

Thank you for all the patches.

regards,
glen lee

> > > +	.hif_sync_ext = sdio_sync_ext,
> > > +	.hif_set_max_bus_speed = sdio_set_max_speed,
> > > +	.hif_set_default_bus_speed = sdio_set_default_speed,
> > >    };
> If the callbacks are not in the same order here, something could
> in theory go wrong. I've tried to verify them by inspection and
> could not find anything here, but you can try reverting this part.
>
> > >    	memset((void *)&g_wlan, 0, sizeof(wilc_wlan_dev_t));
> > >    	g_wlan.io_type = wilc->io_type;
> > > -
> > > -#ifdef WILC_SDIO
> > > -	if (!wilc_hif_sdio.hif_init(wilc, wilc_debug)) {
> > > -		ret = -EIO;
> > > -		goto _fail_;
> > > -	}
> > > -	memcpy((void *)&g_wlan.hif_func, &wilc_hif_sdio,
> > > -	       sizeof(struct wilc_hif_func));
> > > -#else
> > > -	if (!wilc_hif_spi.hif_init(wilc, wilc_debug)) {
> > > +	g_wlan.hif_func = *wilc->ops;
> > > +	if (!g_wlan.hif_func.hif_init(wilc, wilc_debug)) {
> > >    		ret = -EIO;
> > >    		goto _fail_;
> > >    	}
> > > -	memcpy((void *)&g_wlan.hif_func, &wilc_hif_spi,
> > > -	       sizeof(struct wilc_hif_func));
> > > -#endif
> This is the most likely part I found:
>
> doing an assigment instead of memcpy should not make a difference,
> but my new version also called init after copying over the
> operations rather than before. This seemed to be the correct
> order when I did it, but it is a change in behavior that might
> cause problems if some code relies on the hif_func structure
> to be empty at the time that hif_init is called.
>
> 	Arnd

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