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path: root/drivers/usb
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2017-07-06avr32: Retire AVR32 for goodAndy Shevchenko
AVR32 is gone. It's already more than two years for no support in Buildroot, even longer there is no support in GCC (last version is heavily patched 4.2.4). Linux kernel v4.12 got rid of it (and v4.11 didn't build successfully). There is no good point to keep this support in U-Boot either. Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heiko Schocher <hs@denx.de> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
2017-07-03powerpc: remove 4xx supportHeiko Schocher
There was for long time no activity in the 4xx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in 4xx, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
2017-06-29drivers, usb, gadget: fix compiler warnings for at91_udc.cHeiko Schocher
fix warnings: drivers/usb/gadget/at91_udc.c:1344:12: warning: 'at91rm9200_udc_init' defined but not used [-Wunused-function] drivers/usb/gadget/at91_udc.c:1379:13: warning: 'at91rm9200_udc_pullup' defined but not used [-Wunused-function] drivers/usb/gadget/at91_udc.c:1476:12: warning: 'at91sam9263_udc_init' defined but not used [-Wunused-function] Signed-off-by: Heiko Schocher <hs@denx.de>
2017-06-29usb: gadget: Call g_dnl_bind_fixup() before testing g_dnl_serial lengthLukasz Majewski
After the commit SHA1: 842778a091 - the serial number descriptor is only visible when we have non zero length of g_dnl_serial. However, on some platforms (e.g. Siemens) the serial number is set at g_dnl_bind_fixup(), so with the current code we will always omit the serial (since it is not set). This commit moves the g_dnl_bind_fixup() call before the g_dnl_serial length test. Signed-off-by: Lukasz Majewski <lukma@denx.de> Acked-by: Heiko Schocher <hs@denx.de> Tested-by: Heiko Schocher <hs@denx.de>
2017-06-18at91_udc.c: Fix unused variable warningTom Rini
With gcc-6 and later we see warnings that at91sam9263_udc_caps and at91rm9200_udc_caps are unused. Fixes: 620197670a69 ("usb: gadget: at91_udc: add at91_udc into U-Boot") Cc: Lukasz Majewski <lukma@denx.de> Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com> Acked-by: Heiko Schocher <hs@denx.de>
2017-06-17drivers/usb/ehci: Use platform-specific accessorsAlexey Brodkin
Current implementation doesn't allow utilization of platform-specific reads and writes. But some arches or platforms may want to use their accessors that do some extra work like adding barriers for data serialization etc. Interesting enough OHCI accessors already do that so just aligning EHCI to it now. This is a resend of http://patchwork.ozlabs.org/patch/726714/ Back in the day this patch broke some PPC and Sandbox boards as they we missing inclusion of "asm/io.h". Those missing items were fixed with: 1) http://patchwork.ozlabs.org/patch/751397/ 2) http://patchwork.ozlabs.org/patch/771099/ So now it should be safe to apply this patch. FWIW TravisCI builds everything with all 3 patches in place, see https://travis-ci.org/abrodkin/u-boot/builds/239563813 Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Simon Glass <sjg@chromium.org> Cc: Mateusz Kulikowski <mateusz.kulikowski@gmail.com> Acked-by: Marek Vasut <marex@denx.de>
2017-06-17usb: dwc2: force to host mode if not support HNP/SRPMeng Dongyang
In current code, after running the command of "usb start", the controller will keep in otg mode and can't switch to host mode if not support SNP/SRP capability. So add the property of "hnp-srp-disable" in the DTS to config the contrller work in force mode of host. Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
2017-06-16powerpc, 5xxx, 512x: remove support for mpc5xxx and mpc512xHeiko Schocher
There was for long time no activity in the mpx5xxx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in mpc5xxx, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
2017-06-12powerpc, 8260: remove support for mpc8260Heiko Schocher
There was for long time no activity in the 8260 area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in 8260, so remove it. Signed-off-by: Heiko Schocher <hs@denx.de>
2017-06-12powerpc, 8xx: remove support for 8xxHeiko Schocher
There was for long time no activity in the 8xx area. We need to go further and convert to Kconfig, but it turned out, nobody is interested anymore in 8xx, so remove it (with a heavy heart, knowing that I remove here the root of U-Boot). Signed-off-by: Heiko Schocher <hs@denx.de>
2017-06-07rockchip: usb: host: xhci-rockchip: add support for rk3328Meng Dongyang
Add the compatible "rockchip,rk3328-xhci" in match table for rk3328 to probe xhci controller. Use fixed regulator to control the voltage of vbus and turn off vbus when usb stop. Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2017-06-06Merge git://git.denx.de/u-boot-usbTom Rini
2017-06-05common: arm: freescale: layerscape: Move header files out of common.hSimon Glass
We should not have an arch-specific header file in common.h. Adjust the board files a little so it is not needed, and drop it. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-05common: freescale: Move arch-specific declarationsSimon Glass
The declarations should not be in common.h. Move them to the arch-specific headers. Signed-off-by: Simon Glass <sjg@chromium.org> [trini: Fixup thinko defined(FSL_LSCH3) -> defined(CONFIG_FSL_LSCH3)] Signed-off-by: Tom Rini <trini@konsulko.com>
2017-06-05arm: Add explicit include of <asm/mach-types.h>Simon Glass
Rather than relying on common.h to provide this include, which is going away at some point, include it explicitly in each file. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
2017-06-05samsung: Drop more references fo s3c24x0Simon Glass
This is dead code now. Drop it. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-05samsung: usb: Drop ohci-s3c24xx driverSimon Glass
This is not used anymore. Drop it. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-05ehci-pci: Prepare for usage of readl()/writel() accessorsAlexey Brodkin
We used to have opencoded ehci_readl()/writel() which required no external functions to be called. Now with attempt to switch to generic readl()/writel() accessors we see a missing declaration of those accessors in ehci-ppc4xx. Something like that happens if applied http://patchwork.ozlabs.org/patch/726714/: --------------------------------->8--------------------------- CC drivers/usb/host/ehci-pci.o In file included from drivers/usb/host/ehci-pci.c:14:0: drivers/usb/host/ehci-pci.c: In function 'ehci_pci_init': drivers/usb/host/ehci.h:108:36: warning: implicit declaration of function 'readl' [-Wimplicit-function-declaration] #define ehci_readl(x) cpu_to_le32(readl(x)) ^ drivers/usb/host/ehci.h:23:26: note: in definition of macro 'HC_LENGTH' #define HC_LENGTH(p) (((p) >> 0) & 0x00ff) ^ include/linux/byteorder/generic.h:89:21: note: in expansion of macro '__cpu_to_le32' #define cpu_to_le32 __cpu_to_le32 ^~~~~~~~~~~~~ drivers/usb/host/ehci-pci.c:33:14: note: in expansion of macro 'ehci_readl' HC_LENGTH(ehci_readl(&hccr->cr_capbase))); ^~~~~~~~~~ --------------------------------->8--------------------------- This the same fix as we have for "ehci-ppc4xx" in 83cb46c286b "ehci-ppc4xx: Prepare for usage of readl()/writel() accessors". Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com> Cc: Marek Vasut <marex@denx.de> Cc: Stefan Roese <sr@denx.de>
2017-06-01sandbox: usb: Convert emulators to livetreeSimon Glass
Update the sandbox flash and hub USB emulators to support a live device tree. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-01dm: usb: Convert uclass to livetreeSimon Glass
Update the usb uclass to support a live device tree. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-01dm: gpio: Add live tree supportSimon Glass
Add support for requesting GPIOs with a live device tree. This involves adjusting the function signature for the legacy function gpio_request_by_name_nodev(), so fix up all callers. Signed-off-by: Simon Glass <sjg@chromium.org> Fixes to stm32f746-disco.c: Signed-off-by: Tom Rini <trini@konsulko.com>
2017-06-01dm: core: Update device_bind_driver_to_node() to use ofnodeSimon Glass
Adjust this function to us an ofnode instead of an offset, so it can be used with livetree. This involves updating all callers. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-01dm: core: Rename of_device_is_compatible()Simon Glass
The of_ prefix conflicts with the livetree version of this function. Rename it to avoid problems when we add livetree support. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-01dm: Rename dev_addr..() functionsSimon Glass
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-06-01dm: Use dm.h header when driver mode is usedSimon Glass
This header includes things that are needed to make driver build. Adjust existing users to include that always, even if other dm/ includes are present Signed-off-by: Simon Glass <sjg@chromium.org>
2017-05-26Merge git://git.denx.de/u-boot-fsl-qoriqTom Rini
2017-05-23armv8: ls2080ardb: Add LS2081ARDB board supportPriyanka Jain
LS2081ARDB board is similar to LS2080ARDB board with few differences It hosts LS2081A SoC Default boot source is QSPI-boot It does not have IFC interface RTC and QSPI flash device are different It provides QIXIS access via I2C Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com> Signed-off-by: Santan Kumar <santan.kumar@nxp.com> Reviewed-by: York Sun <york.sun@nxp.com>
2017-05-22usb: ehci: Add Renesas RCar M3/H3 EHCI supportHiroyuki Yokoyama
Add a USB controller driver for the EHCI block in R8A7795/R8A7796 SoC. This is a stopgap measure until we have proper DT support, clock and reset framework in place, at which point we can switch to ehci-generic. Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com> Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> Reviewed-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2017-05-21net: usb: mcs7830: fix non-DM ingress pathUri Mashiach
The mcs7830_recv() (non-DM) function discards good packets and tries to process "bad" packets due to incorrect test condition. Fix the condition and return the proper value as described in function doc. Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il> Acked-by: Igor Grinberg <grinberg@compulab.co.il>
2017-05-18usb: lpc32xx: add i2c DM supportLiam Beguin
Add DM support for i2c functions. Signed-off-by: Liam Beguin <lbeguin@tycoint.com> Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com> Reviewed-by: Marek Vasut <marex@denx.de>
2017-05-15Kconfig: OMAP: USB: Migrate CONFIG_USB_EHCI_OMAP to KconfigTom Rini
Follow the exiting logic for the i.MX options when migrating this option. Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Marek Vasut <marex@denx.de>
2017-05-15Kconfig: USB: Migrate existing USB_EHCI_xxx optionsTom Rini
The following options are migrated over fully now: - USB_EHCI_ATMEL - USB_EHCI_MARVELL - USB_EHCI_MX6 - USB_EHCI_MX7 - USB_EHCI_MSM - USB_EHCI_ZYNQ - USB_EHCI_GENERIC This also requires fixing the depends on USB_EHCI_MARVELL as it's used by Orion5X and Kirkwood as well. Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Marek Vasut <marex@denx.de>
2017-05-15Kconfig: USB: Migrate CONFIG_USB_EHCI_HCD users to KconfigTom Rini
Migrate the rest of the users of CONFIG_USB_EHCI_HCD over to Kconfig. For a few SoCs, imply or default y this if USB is enabled. In some cases we had not already migrated to CONFIG_USB so do that as well. Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Marek Vasut <marex@denx.de>
2017-05-15Kconfig: USB: Migrate CONFIG_USB_EHCI to CONFIG_USB_EHCI_HCDTom Rini
In order to be able to migrate the various SoC EHCI CONFIG options we first need to finish the switch from CONFIG_USB_EHCI to CONFIG_USB_EHCI_HCD. Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Marek Vasut <marex@denx.de>
2017-05-15omap4: Drop redundant CONFIG_OMAP4430 symbolTom Rini
While there are a few different OMAP4 SoCs, today we always set CONFIG_OMAP4430 and CONFIG_OMAP44XX. Convert the few test of CONFIG_OMAP4430 to CONFIG_OMAP44XX. Cc: Marek Vasut <marex@denx.de> Cc: Paul Kocialkowski <contact@paulk.fr> Signed-off-by: Tom Rini <trini@konsulko.com>
2017-05-15omap3: Drop CONFIG_OMAP3_EVM, switch to CONFIG_TARGET_OMAP3_EVM when neededTom Rini
We make use of CONFIG_OMAP3_EVM today to know when to do a specific tweak in MUSB. This can be tested on via CONFIG_TARGET_OMAP3_EVM instead, so switch there so we can drop the now unused symbol CONFIG_OMAP3_EVM. In investigating what to do about the symbol usage we see that the cairo board defines the same function, but never called it (as it does not define CONFIG_OMAP3_EVM) and was just returning anyhow, so drop that function from that board. Cc: "Albert ARIBAUD (3ADEV)" <albert.aribaud@3adev.fr> Cc: Marek Vasut <marex@denx.de> Signed-off-by: Tom Rini <trini@konsulko.com>
2017-05-12usb: gadget: avoid variable name clipping in cb_getvarnicolas.le.bayon@st.com
Hi, A kind reminder to look at this patch (already reviewed by Marek and acked by Lukasz), and if possible to put it in the next pull list, or the one after is timing is too short. Thanks in advance for your time Best Regards Nicolas -----Original Message----- From: Nicolas LE BAYON Sent: mardi 25 avril 2017 10:18 To: Nicolas LE BAYON <nicolas.le.bayon@st.com>; u-boot@lists.denx.de; lukma@denx.de; marex@denx.de Cc: nlebayon@gmail.com; Patrice CHOTARD <patrice.chotard@st.com>; Jean-philippe ROMAIN <jean-philippe.romain@st.com> Subject: [U-Boot][PATCH v7] usb: gadget: avoid variable name clipping in cb_getvar From: Nicolas Le Bayon <nicolas.le.bayon@st.com> Instead of using a fixed-size array to store variable name, preferring a dynamic allocation treats correctly all variable name lengths. Variable names are growing through releases and features. By this way, name clipping is prevented. Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com> Reviewed-by: Marek Vasut <marex@denx.de> Acked-by: Lukasz Majewski <lukma@denx.de>
2017-05-10net: smsc95xx: Correct free_pkt() implementationSimon Glass
On further review this returns the wrong packet length from the driver. It may not be noticed since protocols will take care of it. Fix it by subtracting the header length from the packet length returned. Signed-off-by: Simon Glass <sjg@chromium.org>
2017-05-08arm: am57xx: cl-som-am57x: invoke clock API to enable/disable clocksUri Mashiach
Invoke enable_usb_clocks during board_usb_init and disable_usb_clocks during board_usb_exit to enable and disable clocks respectively. Modifications: * Enable USB clocks in the OMAP version of the function board_usb_init. * Disable USB clocks in the OMAP version of the function board_usb_cleanup. Cc: Marek Vasut <marex@denx.de> Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il> Reviewed-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
2017-05-08usb: host: xhci-omap: fix double weak board_usb_init functionsUri Mashiach
A weak version of the function board_usb_init is implemented in: common/usb.c drivers/usb/host/xhci-omap.c To fix the double implementations: * Convert the board_usb_init function in drivers/usb/host/xhci-omap.c normal (not weak). * The function board_usb_init in drivers/usb/host/xhci-omap.c calls to the weak function omap_xhci_board_usb_init. * Rename board version of the function board_usb_init to omap_xhci_board_usb_init. Done only for boards that defines CONFIG_USB_XHCI_OMAP. To achieve the same flexibility with the function board_usb_cleanup: * Add a normal (not weak) implementation of the function board_usb_cleanup in drivers/usb/host/xhci-omap.c * The function board_usb_cleanup in drivers/usb/host/xhci-omap.c calls to the weak function omap_xhci_board_usb_cleanup. * Rename board version of the function board_usb_cleanup to omap_xhci_board_usb_cleanup. Done only for boards that defines CONFIG_USB_XHCI_OMAP. Cc: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il> Acked-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Roger Quadros <rogerq@ti.com>
2017-05-08arm: usb: dra7xx: xHCI registers based on USB port indexUri Mashiach
Modify the determination of the base address of xHCI registers of DRA7XX targets. Before the commit: by the target. After the commit: by the USB port index. Cc: Lokesh Vutla <lokeshvutla@ti.com> Cc: Marek Vasut <marex@denx.de> Cc: Roger Quadros <rogerq@ti.com> Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il> Reviewed-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Roger Quadros <rogerq@ti.com> Acked-by: Marek Vasut <marex@denx.de> Acked-by: Marek Vasut <marex@denx.de>
2017-04-25ehci-ppc4xx: Prepare for usage of readl()/writel() accessorsAlexey Brodkin
We used to have opencoded ehci_readl()/writel() which required no external functions to be called. Now with attempt to switch to generic readl()/writel() accessors we see a missing declaration of those accessors in ehci-ppc4xx. Something like that happens if applied http://patchwork.ozlabs.org/patch/726714/: ---------------->8--------------- CC drivers/usb/host/ehci-ppc4xx.o drivers/usb/host/ehci-ppc4xx.c: In function 'ehci_hcd_init': drivers/usb/host/ehci-ppc4xx.c:23:3: warning: implicit declaration of function 'readl' [-Wimplicit-function-declaration] HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase))); ^ ---------------->8--------------- Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Tom Rini <trini@konsulko.com> Cc: Marek Vasut <marex@denx.de> Cc: Stefan Roese <sr@denx.de> Reviewed-by: Stefan Roese <sr@denx.de>
2017-04-25usb: musb: avoid out of bound access in udc_setup_epHeinrich Schuchardt
For id = 15 an out of bound access occurs in udc_setup_ep(). Increase the size of epinfo[] from 30 to 32 to encompass ids 0..15. The problem was highlighted by cppcheck. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2017-04-25musb: properly detect failed initialization of controllerHeinrich Schuchardt
We want to check the result of musb_init_controller and not the address were the result is stored. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2017-04-17armv7: ls1021a: Drop macro CONFIG_LS102XAYork Sun
Use CONFIG_ARCH_LS1021A instead. Signed-off-by: York Sun <york.sun@nxp.com>
2017-04-14usb: dwc2: invalidate the dcache before starting the DMAEddie Cai
We should invalidate the dcache before starting the DMA. In case there are any dirty lines from the DMA buffer in the cache, subsequent cache-line replacements may corrupt the buffer in memory while the DMA is still going on. Cache-line replacement can happen if the CPU tries to bring some other memory locations into the cache while the DMA is going on. Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com> Reviewed-by: Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de>
2017-04-14usb: dwc3: gadget: make cache-maintenance on event buffers more robustPhilipp Tomsich
Merely using dma_alloc_coherent does not ensure that there is no stale data left in the caches for the allocated DMA buffer (i.e. that the affected cacheline may still be dirty). The original code was doing the following (on AArch64, which translates a 'flush' into a 'clean + invalidate'): # during initialisation: 1. allocate buffers via memalign => buffers may still be modified (cached, dirty) # during interrupt processing 2. clean + invalidate buffers => may commit stale data from a modified cacheline 3. read from buffers This could lead to garbage info being written to buffers before reading them during even-processing. To make the event processing more robust, we use the following sequence for the cache-maintenance: # during initialisation: 1. allocate buffers via memalign 2. clean + invalidate buffers (we only need the 'invalidate' part, but dwc3_flush_cache() always performs a 'clean + invalidate') # during interrupt processing 3. read the buffers (we know these lines are not cached, due to the previous invalidation and no other code touching them in-between) 4. clean + invalidate buffers => writes back any modification we may have made during event processing and ensures that the lines are not in the cache the next time we enter interrupt processing Note that with the original sequence, we observe reproducible (depending on the cache state: i.e. running dhcp/usb start before will upset caches to get us around this) issues in the event processing (a fatal synchronous abort in dwc3_gadget_uboot_handle_interrupt on the first time interrupt handling is invoked) when running USB mass storage emulation on our RK3399-Q7 with data-caches on. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2017-04-14usb: dwc3: ensure consistent types for dwc3_flush_cachePhilipp Tomsich
The dwc3_flush_cache() call was declared and used inconsistently: * The declaration assumed 'int' for addresses (a potential issue when running in a LP64 memory model). * The invocation cast the address to 'long'. This change ensures that both the declaration and usage of this function consistently uses 'uintptr_t' for correct behaviour even when the allocated buffers (to be flushed) reside outside of the lower 32bits of memory. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2017-04-14usb: gadget: g_dnl: don't set iProduct nor iSerialNumberFelipe Balbi
Both these numbers are calculated in runtime and dynamically assigned to the device descriptor during bind(). Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2017-04-14usb: gadget: g_dnl: only set iSerialNumber if we have a serial#Felipe Balbi
We don't want to claim that we support a serial number string and later return nothing. Because of that, if g_dnl_serial is an empty string, let's skip setting iSerialNumber to a valid number. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>