Re: [PATCH] Revert "phy: qualcomm: usb28nm: Add MDM9607 init sequence"

[Vinod Koul <vkoul@kernel.org>]

On 14-12-22, 23:37, Marijn Suijten wrote:
> This reverts commit 557a28811c7e0286d3816842032db5eb7bb5f156.
> 
> This commit introduced an init sequence from downstream DT [1] in the
> driver.  As mentioned by the comment above the HSPHY_INIT_CFG macro for
> this sequence:
> 
>     /*
>      * The macro is used to define an initialization sequence.  Each tuple
>      * is meant to program 'value' into phy register at 'offset' with 'delay'
>      * in us followed.
>      */
> 
> Instead of corresponding to offsets into the phy register, the sequence
> read by the downstream driver [2] is passed into ulpi_write [3] which
> crafts the address-value pair into a new value and writes it into the
> same register at USB_ULPI_VIEWPORT [4].  In other words, this init
> sequence is programmed into the hardware in a totally different way than
> downstream and is unlikely to achieve the desired result, if the hsphy
> is working at all.
> 
> An alternative method needs to be found to write these init values at
> the desired location.  Fortunately mdm9607 did not land upstream yet [5]
> and should have its compatible revised to use the generic one, instead
> of a compatible that writes wrong data to the wrong registers.

Applied after adding missing subsystem tag, thanks

-- 
~Vinod