[PATCH] drm/i915/csr: Allow matching unknown HW steppings with generic firmware

Chris Wilson
2016-03-07T12:06:09Z

If the firmware is generic and has a run-anywhere mode, enable it rather
than completely failing on unknown HW revisions.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Sunil Kamath <sunil.kamath@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Animesh Manna <animesh.manna@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
---
This is probably stable@ material since it could allow future hw to
just work.
-Chris
---
drivers/gpu/drm/i915/intel_csr.c | 46 +++++++++++++++++-----------------------
1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
index 902054efb902..575a5821d2a1 100644
--- a/drivers/gpu/drm/i915/intel_csr.c
+++ b/drivers/gpu/drm/i915/intel_csr.c
@@ -188,28 +188,31 @@ static const struct stepping_info bxt_stepping_info[] = {
{'B', '0'}, {'B', '1'}, {'B', '2'}
};

-static const struct stepping_info *intel_get_stepping_info(struct drm_device *dev)
+static const struct stepping_info no_stepping_info = { '*', '*' };
+
+static const struct stepping_info *
+intel_get_stepping_info(struct drm_i915_private *dev_priv)
{
const struct stepping_info *si;
unsigned int size;

- if (IS_KABYLAKE(dev)) {
+ if (IS_KABYLAKE(dev_priv)) {
size = ARRAY_SIZE(kbl_stepping_info);
si = kbl_stepping_info;
- } else if (IS_SKYLAKE(dev)) {
+ } else if (IS_SKYLAKE(dev_priv)) {
size = ARRAY_SIZE(skl_stepping_info);
si = skl_stepping_info;
- } else if (IS_BROXTON(dev)) {
+ } else if (IS_BROXTON(dev_priv)) {
size = ARRAY_SIZE(bxt_stepping_info);
si = bxt_stepping_info;
} else {
- return NULL;
+ size = 0;
}

- if (INTEL_REVID(dev) < size)
- return si + INTEL_REVID(dev);
+ if (INTEL_REVID(dev_priv) < size)
+ return si + INTEL_REVID(dev_priv);

- return NULL;
+ return &no_stepping_info;
}

/**
@@ -252,13 +255,11 @@ bool intel_csr_load_program(struct drm_i915_private *dev_priv)
static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
const struct firmware *fw)
{
- struct drm_device *dev = dev_priv->dev;
struct intel_css_header *css_header;
struct intel_package_header *package_header;
struct intel_dmc_header *dmc_header;
struct intel_csr *csr = &dev_priv->csr;
- const struct stepping_info *stepping_info = intel_get_stepping_info(dev);
- char stepping, substepping;
+ const struct stepping_info *si = intel_get_stepping_info(dev_priv);
uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
uint32_t i;
uint32_t *dmc_payload;
@@ -266,14 +267,6 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
if (!fw)
return NULL;

- if (!stepping_info) {
- DRM_ERROR("Unknown stepping info, firmware loading failed\n");
- return NULL;
- }
-
- stepping = stepping_info->stepping;
- substepping = stepping_info->substepping;
-
/* Extract CSS Header information*/
css_header = (struct intel_css_header *)fw->data;
if (sizeof(struct intel_css_header) !=
@@ -285,7 +278,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,

csr->version = css_header->version;

- if ((IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) &&
+ if ((IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) &&
csr->version < SKL_CSR_VERSION_REQUIRED) {
DRM_INFO("Refusing to load old Skylake DMC firmware v%u.%u,"
" please upgrade to v%u.%u or later"
@@ -313,11 +306,11 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
/* Search for dmc_offset to find firware binary. */
for (i = 0; i < package_header->num_entries; i++) {
if (package_header->fw_info[i].substepping == '*' &&
- stepping == package_header->fw_info[i].stepping) {
+ si->stepping == package_header->fw_info[i].stepping) {
dmc_offset = package_header->fw_info[i].offset;
break;
- } else if (stepping == package_header->fw_info[i].stepping &&
- substepping == package_header->fw_info[i].substepping) {
+ } else if (si->stepping == package_header->fw_info[i].stepping &&
+ si->substepping == package_header->fw_info[i].substepping) {
dmc_offset = package_header->fw_info[i].offset;
break;
} else if (package_header->fw_info[i].stepping == '*' &&
@@ -325,7 +318,8 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
dmc_offset = package_header->fw_info[i].offset;
}
if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
- DRM_ERROR("Firmware not supported for %c stepping\n", stepping);
+ DRM_ERROR("Firmware not supported for %c stepping\n",
+ si->stepping);
return NULL;
}
readcount += dmc_offset;
@@ -371,9 +365,7 @@ static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
return NULL;
}

- memcpy(dmc_payload, &fw->data[readcount], nbytes);
-
- return dmc_payload;
+ return memcpy(dmc_payload, &fw->data[readcount], nbytes);
}

static void csr_load_work_fn(struct work_struct *work)
--
2.7.0