[Intel-gfx] [SKL-DMC-BUGFIX 1/5] drm/i915/gen9: Removed byte swapping for csr firmware

[Nagaraju, Vathsala]

"This patch contains the changes to remove the byte swapping logic introduced with old dmc firmware."
Which version of DMC need reversal  logic?  Atleast , 4,1.16,1.18 follow the same format.

-----Original Message-----
From: Manna, Animesh 
Sent: Monday, August 3, 2015 9:56 PM
To: intel-gfx at lists.freedesktop.org
Cc: Manna, Animesh; Vetter, Daniel; Lespiau, Damien; Deak, Imre; Kamath, Sunil; Nagaraju, Vathsala
Subject: [SKL-DMC-BUGFIX 1/5] drm/i915/gen9: Removed byte swapping for csr firmware

This patch contains the changes to remove the byte swapping logic introduced with old dmc firmware.
While debugging PC10 entry issue for skylake found with latest dmc firmware version 1.18 without byte swapping dmc is working fine and able to enter PC10.

v1: Initial version.

v2: Corrected firmware size during memcpy(). (Suggested by Sunil)

Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Damien Lespiau <damien.lespiau at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Sunil Kamath <sunil.kamath at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h  |  2 +-  drivers/gpu/drm/i915/intel_csr.c | 16 ++++------------
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index b94ada9..9d0ee58 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -742,7 +742,7 @@ enum csr_state {
 
 struct intel_csr {
 	const char *fw_path;
-	__be32 *dmc_payload;
+	uint32_t *dmc_payload;
 	uint32_t dmc_fw_size;
 	uint32_t mmio_count;
 	uint32_t mmioaddr[8];
diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 6d8a7bf..ba1ae03 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -244,7 +244,7 @@ void intel_csr_load_status_set(struct drm_i915_private *dev_priv,  void intel_csr_load_program(struct drm_device *dev)  {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	__be32 *payload = dev_priv->csr.dmc_payload;
+	u32 *payload = dev_priv->csr.dmc_payload;
 	uint32_t i, fw_size;
 
 	if (!IS_GEN9(dev)) {
@@ -256,7 +256,7 @@ void intel_csr_load_program(struct drm_device *dev)
 	fw_size = dev_priv->csr.dmc_fw_size;
 	for (i = 0; i < fw_size; i++)
 		I915_WRITE(CSR_PROGRAM_BASE + i * 4,
-			(u32 __force)payload[i]);
+			payload[i]);
 
 	for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 		I915_WRITE(dev_priv->csr.mmioaddr[i],
@@ -279,7 +279,7 @@ static void finish_csr_load(const struct firmware *fw, void *context)
 	char substepping = intel_get_substepping(dev);
 	uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
 	uint32_t i;
-	__be32 *dmc_payload;
+	uint32_t *dmc_payload;
 	bool fw_loaded = false;
 
 	if (!fw) {
@@ -375,15 +375,7 @@ static void finish_csr_load(const struct firmware *fw, void *context)
 	}
 
 	dmc_payload = csr->dmc_payload;
-	for (i = 0; i < dmc_header->fw_size; i++) {
-		uint32_t *tmp = (u32 *)&fw->data[readcount + i * 4];
-		/*
-		 * The firmware payload is an array of 32 bit words stored in
-		 * little-endian format in the firmware image and programmed
-		 * as 32 bit big-endian format to memory.
-		 */
-		dmc_payload[i] = cpu_to_be32(*tmp);
-	}
+	memcpy(dmc_payload, &fw->data[readcount], nbytes);
 
 	/* load csr program during system boot, as needed for DC states */
 	intel_csr_load_program(dev);
--
2.0.2