maestro3: treat firmware data as const

The maestro3 driver is byte-swapping its firmware to be host-endian in
advance, when it doesn't seem to be necessary -- we could just use
le16_to_cpu() as we load it.

Doing that means that we need to switch the in-tree firmware to be
little-endian too.

Take the least intrusive way of doing this, which is to switch the
existing snd_m3_convert_from_le() function to convert _to_ little-endian
instead, and use it on the in-tree firmware instead of the loaded
firmware. It's a bit suboptimal but doesn't matter much right now
because we're about to remove the special cases for the in-tree version
anyway.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index a536c59..9dfba6e 100644 (file)
--- a/sound/pci/maestro3.c
+++ b/sound/pci/maestro3.c
@@ -2240,18 +2240,16 @@ static const struct firmware assp_minisrc = {
        .size = sizeof assp_minisrc_image
 };
 
-#else /* CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL */
-
 #ifdef __LITTLE_ENDIAN
-static inline void snd_m3_convert_from_le(const struct firmware *fw) { }
+static inline void snd_m3_convert_to_le(const struct firmware *fw) { }
 #else
-static void snd_m3_convert_from_le(const struct firmware *fw)
+static void snd_m3_convert_to_le(const struct firmware *fw)
 {
        int i;
        u16 *data = (u16 *)fw->data;
 
        for (i = 0; i < fw->size / 2; ++i)
-               le16_to_cpus(&data[i]);
+               cpu_to_le16s(&data[i]);
 }
 #endif
 
@@ -2271,7 +2269,7 @@ static const u16 minisrc_lpf[MINISRC_LPF_LEN] = {
 static void snd_m3_assp_init(struct snd_m3 *chip)
 {
        unsigned int i;
-       u16 *data;
+       const u16 *data;
 
        /* zero kernel data */
        for (i = 0; i < (REV_B_DATA_MEMORY_UNIT_LENGTH * NUM_UNITS_KERNEL_DATA) / 2; i++)
@@ -2289,10 +2287,11 @@ static void snd_m3_assp_init(struct snd_m3 *chip)
                          KDATA_DMA_XFER0);
 
        /* write kernel into code memory.. */
-       data = (u16 *)chip->assp_kernel_image->data;
+       data = (const u16 *)chip->assp_kernel_image->data;
        for (i = 0 ; i * 2 < chip->assp_kernel_image->size; i++) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE, 
-                                 REV_B_CODE_MEMORY_BEGIN + i, data[i]);
+                                 REV_B_CODE_MEMORY_BEGIN + i,
+                                 le16_to_cpu(data[i]));
        }
 
        /*
@@ -2301,10 +2300,10 @@ static void snd_m3_assp_init(struct snd_m3 *chip)
         * drop it there.  It seems that the minisrc doesn't
         * need vectors, so we won't bother with them..
         */
-       data = (u16 *)chip->assp_minisrc_image->data;
+       data = (const u16 *)chip->assp_minisrc_image->data;
        for (i = 0; i * 2 < chip->assp_minisrc_image->size; i++) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE, 
-                                 0x400 + i, data[i]);
+                                 0x400 + i, le16_to_cpu(data[i]));
        }
 
        /*
@@ -2749,8 +2748,7 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
        if (err < 0) {
                snd_m3_free(chip);
                return err;
-       } else
-               snd_m3_convert_from_le(chip->assp_kernel_image);
+       }
 #endif
 
 #ifdef CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL
@@ -2761,8 +2759,7 @@ snd_m3_create(struct snd_card *card, struct pci_dev *pci,
        if (err < 0) {
                snd_m3_free(chip);
                return err;
-       } else
-               snd_m3_convert_from_le(chip->assp_minisrc_image);
+       }
 #endif
 
        if ((err = pci_request_regions(pci, card->driver)) < 0) {
@@ -2915,6 +2912,10 @@ static struct pci_driver driver = {
        
 static int __init alsa_card_m3_init(void)
 {
+#ifdef CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL
+       snd_m3_convert_to_le(&assp_kernel);
+       snd_m3_convert_to_le(&assp_minisrc);
+#endif
        return pci_register_driver(&driver);
 }